| Message ID | 20190611193836.2772-1-shyam.saini@amarulasolutions.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [V2] include: linux: Regularise the use of FIELD_SIZEOF macro | expand |
On Wed, Jun 12, 2019 at 01:08:36AM +0530, Shyam Saini wrote: > In favour of FIELD_SIZEOF, this patch also deprecates other two similar > macros sizeof_field and SIZEOF_FIELD. > > For code compatibility reason, retain sizeof_field macro as a wrapper macro > to FIELD_SIZEOF Can you explain this part? First sentence says you want to remove sizeof_field, and the second says you're keeping it? I thought the point was to switch all of these to FIELD_SIZEOF()? -Kees > > Signed-off-by: Shyam Saini <shyam.saini@amarulasolutions.com> > --- > Changelog: > > V1->V2 > - Consolidate previous patch 1 and 2 into single patch > - For code compatibility reason, retain sizeof_field macro as a > wrapper macro to FIELD_SIZEOF > > arch/arm64/include/asm/processor.h | 10 +++++----- > arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 9 +-------- > drivers/gpu/drm/i915/gvt/scheduler.c | 2 +- > drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c | 4 ++-- > fs/befs/linuxvfs.c | 2 +- > fs/ext2/super.c | 2 +- > fs/ext4/super.c | 2 +- > fs/freevxfs/vxfs_super.c | 2 +- > fs/orangefs/super.c | 2 +- > fs/ufs/super.c | 2 +- > include/linux/kernel.h | 9 --------- > include/linux/slab.h | 2 +- > include/linux/stddef.h | 17 ++++++++++++++--- > kernel/fork.c | 2 +- > kernel/utsname.c | 2 +- > net/caif/caif_socket.c | 2 +- > net/core/skbuff.c | 2 +- > net/ipv4/raw.c | 2 +- > net/ipv6/raw.c | 2 +- > net/sctp/socket.c | 4 ++-- > tools/testing/selftests/bpf/bpf_util.h | 22 +++++++++++++++++++--- > virt/kvm/kvm_main.c | 2 +- > 22 files changed, 58 insertions(+), 47 deletions(-) > > diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h > index fcd0e691b1ea..ace906d887cc 100644 > --- a/arch/arm64/include/asm/processor.h > +++ b/arch/arm64/include/asm/processor.h > @@ -164,13 +164,13 @@ static inline void arch_thread_struct_whitelist(unsigned long *offset, > unsigned long *size) > { > /* Verify that there is no padding among the whitelisted fields: */ > - BUILD_BUG_ON(sizeof_field(struct thread_struct, uw) != > - sizeof_field(struct thread_struct, uw.tp_value) + > - sizeof_field(struct thread_struct, uw.tp2_value) + > - sizeof_field(struct thread_struct, uw.fpsimd_state)); > + BUILD_BUG_ON(FIELD_SIZEOF(struct thread_struct, uw) != > + FIELD_SIZEOF(struct thread_struct, uw.tp_value) + > + FIELD_SIZEOF(struct thread_struct, uw.tp2_value) + > + FIELD_SIZEOF(struct thread_struct, uw.fpsimd_state)); > > *offset = offsetof(struct thread_struct, uw); > - *size = sizeof_field(struct thread_struct, uw); > + *size = FIELD_SIZEOF(struct thread_struct, uw); > } > > #ifdef CONFIG_COMPAT > diff --git a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c > index ba8f82a29a81..44b506a14666 100644 > --- a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c > +++ b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c > @@ -45,13 +45,6 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc; > /* See header file for descriptions of functions */ > > /** > - * This macro returns the size of a member of a structure. > - * Logically it is the same as "sizeof(s::field)" in C++, but > - * C lacks the "::" operator. > - */ > -#define SIZEOF_FIELD(s, field) sizeof(((s *)NULL)->field) > - > -/** > * This macro returns a member of the > * cvmx_bootmem_named_block_desc_t structure. These members can't > * be directly addressed as they might be in memory not directly > @@ -65,7 +58,7 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc; > #define CVMX_BOOTMEM_NAMED_GET_FIELD(addr, field) \ > __cvmx_bootmem_desc_get(addr, \ > offsetof(struct cvmx_bootmem_named_block_desc, field), \ > - SIZEOF_FIELD(struct cvmx_bootmem_named_block_desc, field)) > + FIELD_SIZEOF(struct cvmx_bootmem_named_block_desc, field)) > > /** > * This function is the implementation of the get macros defined > diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c > index 0f919f0a43d4..820f95a52542 100644 > --- a/drivers/gpu/drm/i915/gvt/scheduler.c > +++ b/drivers/gpu/drm/i915/gvt/scheduler.c > @@ -1243,7 +1243,7 @@ int intel_vgpu_setup_submission(struct intel_vgpu *vgpu) > sizeof(struct intel_vgpu_workload), 0, > SLAB_HWCACHE_ALIGN, > offsetof(struct intel_vgpu_workload, rb_tail), > - sizeof_field(struct intel_vgpu_workload, rb_tail), > + FIELD_SIZEOF(struct intel_vgpu_workload, rb_tail), > NULL); > > if (!s->workloads) { > diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c > index 46baf3b44309..c0447bf07fbb 100644 > --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c > +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c > @@ -49,13 +49,13 @@ struct mlxsw_sp_fid_8021d { > }; > > static const struct rhashtable_params mlxsw_sp_fid_ht_params = { > - .key_len = sizeof_field(struct mlxsw_sp_fid, fid_index), > + .key_len = FIELD_SIZEOF(struct mlxsw_sp_fid, fid_index), > .key_offset = offsetof(struct mlxsw_sp_fid, fid_index), > .head_offset = offsetof(struct mlxsw_sp_fid, ht_node), > }; > > static const struct rhashtable_params mlxsw_sp_fid_vni_ht_params = { > - .key_len = sizeof_field(struct mlxsw_sp_fid, vni), > + .key_len = FIELD_SIZEOF(struct mlxsw_sp_fid, vni), > .key_offset = offsetof(struct mlxsw_sp_fid, vni), > .head_offset = offsetof(struct mlxsw_sp_fid, vni_ht_node), > }; > diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c > index 462d096ff3e9..06ffd4829e2e 100644 > --- a/fs/befs/linuxvfs.c > +++ b/fs/befs/linuxvfs.c > @@ -438,7 +438,7 @@ befs_init_inodecache(void) > SLAB_ACCOUNT), > offsetof(struct befs_inode_info, > i_data.symlink), > - sizeof_field(struct befs_inode_info, > + FIELD_SIZEOF(struct befs_inode_info, > i_data.symlink), > init_once); > if (befs_inode_cachep == NULL) > diff --git a/fs/ext2/super.c b/fs/ext2/super.c > index 1d7ab73b1014..d9a6c81f4a47 100644 > --- a/fs/ext2/super.c > +++ b/fs/ext2/super.c > @@ -220,7 +220,7 @@ static int __init init_inodecache(void) > (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| > SLAB_ACCOUNT), > offsetof(struct ext2_inode_info, i_data), > - sizeof_field(struct ext2_inode_info, i_data), > + FIELD_SIZEOF(struct ext2_inode_info, i_data), > init_once); > if (ext2_inode_cachep == NULL) > return -ENOMEM; > diff --git a/fs/ext4/super.c b/fs/ext4/super.c > index 4079605d437a..b1b5856248bd 100644 > --- a/fs/ext4/super.c > +++ b/fs/ext4/super.c > @@ -1148,7 +1148,7 @@ static int __init init_inodecache(void) > (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| > SLAB_ACCOUNT), > offsetof(struct ext4_inode_info, i_data), > - sizeof_field(struct ext4_inode_info, i_data), > + FIELD_SIZEOF(struct ext4_inode_info, i_data), > init_once); > if (ext4_inode_cachep == NULL) > return -ENOMEM; > diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c > index a89f68c3cbed..ffd22f85bbe0 100644 > --- a/fs/freevxfs/vxfs_super.c > +++ b/fs/freevxfs/vxfs_super.c > @@ -329,7 +329,7 @@ vxfs_init(void) > sizeof(struct vxfs_inode_info), 0, > SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, > offsetof(struct vxfs_inode_info, vii_immed.vi_immed), > - sizeof_field(struct vxfs_inode_info, > + FIELD_SIZEOF(struct vxfs_inode_info, > vii_immed.vi_immed), > NULL); > if (!vxfs_inode_cachep) > diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c > index ee5efdc35cc1..30f625059ad9 100644 > --- a/fs/orangefs/super.c > +++ b/fs/orangefs/super.c > @@ -646,7 +646,7 @@ int orangefs_inode_cache_initialize(void) > ORANGEFS_CACHE_CREATE_FLAGS, > offsetof(struct orangefs_inode_s, > link_target), > - sizeof_field(struct orangefs_inode_s, > + FIELD_SIZEOF(struct orangefs_inode_s, > link_target), > orangefs_inode_cache_ctor); > > diff --git a/fs/ufs/super.c b/fs/ufs/super.c > index 3d247c0d92aa..1e8bcd950f6d 100644 > --- a/fs/ufs/super.c > +++ b/fs/ufs/super.c > @@ -1469,7 +1469,7 @@ static int __init init_inodecache(void) > (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| > SLAB_ACCOUNT), > offsetof(struct ufs_inode_info, i_u1.i_symlink), > - sizeof_field(struct ufs_inode_info, > + FIELD_SIZEOF(struct ufs_inode_info, > i_u1.i_symlink), > init_once); > if (ufs_inode_cachep == NULL) > diff --git a/include/linux/kernel.h b/include/linux/kernel.h > index 74b1ee9027f5..4672391cdb5b 100644 > --- a/include/linux/kernel.h > +++ b/include/linux/kernel.h > @@ -79,15 +79,6 @@ > */ > #define round_down(x, y) ((x) & ~__round_mask(x, y)) > > -/** > - * FIELD_SIZEOF - get the size of a struct's field > - * @t: the target struct > - * @f: the target struct's field > - * Return: the size of @f in the struct definition without having a > - * declared instance of @t. > - */ > -#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) > - > #define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP > > #define DIV_ROUND_DOWN_ULL(ll, d) \ > diff --git a/include/linux/slab.h b/include/linux/slab.h > index 9449b19c5f10..8bdfdd389b37 100644 > --- a/include/linux/slab.h > +++ b/include/linux/slab.h > @@ -175,7 +175,7 @@ void memcg_destroy_kmem_caches(struct mem_cgroup *); > sizeof(struct __struct), \ > __alignof__(struct __struct), (__flags), \ > offsetof(struct __struct, __field), \ > - sizeof_field(struct __struct, __field), NULL) > + FIELD_SIZEOF(struct __struct, __field), NULL) > > /* > * Common kmalloc functions provided by all allocators > diff --git a/include/linux/stddef.h b/include/linux/stddef.h > index 998a4ba28eba..a5960e2b4a8b 100644 > --- a/include/linux/stddef.h > +++ b/include/linux/stddef.h > @@ -20,12 +20,23 @@ enum { > #endif > > /** > - * sizeof_field(TYPE, MEMBER) > + * FIELD_SIZEOF - get the size of a struct's field > + * @t: the target struct > + * @f: the target struct's field > + * Return: the size of @f in the struct definition without having a > + * declared instance of @t. > + */ > +#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f)) > + > +/* > + * For code compatibility > * > + * sizeof_field(TYPE, MEMBER) > * @TYPE: The structure containing the field of interest > * @MEMBER: The field to return the size of > */ > -#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) > + > +#define sizeof_field(TYPE, MEMBER) FIELD_SIZEOF(TYPE, MEMBER) > > /** > * offsetofend(TYPE, MEMBER) > @@ -34,6 +45,6 @@ enum { > * @MEMBER: The member within the structure to get the end offset of > */ > #define offsetofend(TYPE, MEMBER) \ > - (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER)) > + (offsetof(TYPE, MEMBER) + FIELD_SIZEOF(TYPE, MEMBER)) > > #endif > diff --git a/kernel/fork.c b/kernel/fork.c > index 75675b9bf6df..ef40b95bf82c 100644 > --- a/kernel/fork.c > +++ b/kernel/fork.c > @@ -2553,7 +2553,7 @@ void __init proc_caches_init(void) > mm_size, ARCH_MIN_MMSTRUCT_ALIGN, > SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT, > offsetof(struct mm_struct, saved_auxv), > - sizeof_field(struct mm_struct, saved_auxv), > + FIELD_SIZEOF(struct mm_struct, saved_auxv), > NULL); > vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC|SLAB_ACCOUNT); > mmap_init(); > diff --git a/kernel/utsname.c b/kernel/utsname.c > index f0e491193009..28257c571553 100644 > --- a/kernel/utsname.c > +++ b/kernel/utsname.c > @@ -174,6 +174,6 @@ void __init uts_ns_init(void) > "uts_namespace", sizeof(struct uts_namespace), 0, > SLAB_PANIC|SLAB_ACCOUNT, > offsetof(struct uts_namespace, name), > - sizeof_field(struct uts_namespace, name), > + FIELD_SIZEOF(struct uts_namespace, name), > NULL); > } > diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c > index 13ea920600ae..3306bbed77eb 100644 > --- a/net/caif/caif_socket.c > +++ b/net/caif/caif_socket.c > @@ -1033,7 +1033,7 @@ static int caif_create(struct net *net, struct socket *sock, int protocol, > .owner = THIS_MODULE, > .obj_size = sizeof(struct caifsock), > .useroffset = offsetof(struct caifsock, conn_req.param), > - .usersize = sizeof_field(struct caifsock, conn_req.param) > + .usersize = FIELD_SIZEOF(struct caifsock, conn_req.param) > }; > > if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN)) > diff --git a/net/core/skbuff.c b/net/core/skbuff.c > index 47c1aa9ee045..816bea0c4a8e 100644 > --- a/net/core/skbuff.c > +++ b/net/core/skbuff.c > @@ -3983,7 +3983,7 @@ void __init skb_init(void) > 0, > SLAB_HWCACHE_ALIGN|SLAB_PANIC, > offsetof(struct sk_buff, cb), > - sizeof_field(struct sk_buff, cb), > + FIELD_SIZEOF(struct sk_buff, cb), > NULL); > skbuff_fclone_cache = kmem_cache_create("skbuff_fclone_cache", > sizeof(struct sk_buff_fclones), > diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c > index 0b8e06ca75d6..efa4c745f7b9 100644 > --- a/net/ipv4/raw.c > +++ b/net/ipv4/raw.c > @@ -977,7 +977,7 @@ struct proto raw_prot = { > .unhash = raw_unhash_sk, > .obj_size = sizeof(struct raw_sock), > .useroffset = offsetof(struct raw_sock, filter), > - .usersize = sizeof_field(struct raw_sock, filter), > + .usersize = FIELD_SIZEOF(struct raw_sock, filter), > .h.raw_hash = &raw_v4_hashinfo, > #ifdef CONFIG_COMPAT > .compat_setsockopt = compat_raw_setsockopt, > diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c > index 70693bc7ad9d..257c71e22d74 100644 > --- a/net/ipv6/raw.c > +++ b/net/ipv6/raw.c > @@ -1292,7 +1292,7 @@ struct proto rawv6_prot = { > .unhash = raw_unhash_sk, > .obj_size = sizeof(struct raw6_sock), > .useroffset = offsetof(struct raw6_sock, filter), > - .usersize = sizeof_field(struct raw6_sock, filter), > + .usersize = FIELD_SIZEOF(struct raw6_sock, filter), > .h.raw_hash = &raw_v6_hashinfo, > #ifdef CONFIG_COMPAT > .compat_setsockopt = compat_rawv6_setsockopt, > diff --git a/net/sctp/socket.c b/net/sctp/socket.c > index 39ea0a37af09..6b648a6033b9 100644 > --- a/net/sctp/socket.c > +++ b/net/sctp/socket.c > @@ -9377,7 +9377,7 @@ struct proto sctp_prot = { > .useroffset = offsetof(struct sctp_sock, subscribe), > .usersize = offsetof(struct sctp_sock, initmsg) - > offsetof(struct sctp_sock, subscribe) + > - sizeof_field(struct sctp_sock, initmsg), > + FIELD_SIZEOF(struct sctp_sock, initmsg), > .sysctl_mem = sysctl_sctp_mem, > .sysctl_rmem = sysctl_sctp_rmem, > .sysctl_wmem = sysctl_sctp_wmem, > @@ -9419,7 +9419,7 @@ struct proto sctpv6_prot = { > .useroffset = offsetof(struct sctp6_sock, sctp.subscribe), > .usersize = offsetof(struct sctp6_sock, sctp.initmsg) - > offsetof(struct sctp6_sock, sctp.subscribe) + > - sizeof_field(struct sctp6_sock, sctp.initmsg), > + FIELD_SIZEOF(struct sctp6_sock, sctp.initmsg), > .sysctl_mem = sysctl_sctp_mem, > .sysctl_rmem = sysctl_sctp_rmem, > .sysctl_wmem = sysctl_sctp_wmem, > diff --git a/tools/testing/selftests/bpf/bpf_util.h b/tools/testing/selftests/bpf/bpf_util.h > index a29206ebbd13..571c35aac90f 100644 > --- a/tools/testing/selftests/bpf/bpf_util.h > +++ b/tools/testing/selftests/bpf/bpf_util.h > @@ -58,13 +58,29 @@ static inline unsigned int bpf_num_possible_cpus(void) > # define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) > #endif > > -#ifndef sizeof_field > -#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) > +/* > + * FIELD_SIZEOF - get the size of a struct's field > + * @t: the target struct > + * @f: the target struct's field > + * Return: the size of @f in the struct definition without having a > + * declared instance of @t. > + */ > +#ifndef FIELD_SIZEOF > +#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f)) > #endif > > +/* > + * For code compatibility > + * > + * sizeof_field(TYPE, MEMBER) > + * @TYPE: The structure containing the field of interest > + * @MEMBER: The field to return the size of > + */ > +#define sizeof_field(TYPE, MEMBER) FIELD_SIZEOF(TYPE, MEMBER) > + > #ifndef offsetofend > #define offsetofend(TYPE, MEMBER) \ > - (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER)) > + (offsetof(TYPE, MEMBER) + FIELD_SIZEOF(TYPE, MEMBER)) > #endif > > #endif /* __BPF_UTIL__ */ > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index ca54b09adf5b..e43e3a26f6ab 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -4275,7 +4275,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, > kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align, > SLAB_ACCOUNT, > offsetof(struct kvm_vcpu, arch), > - sizeof_field(struct kvm_vcpu, arch), > + FIELD_SIZEOF(struct kvm_vcpu, arch), > NULL); > if (!kvm_vcpu_cache) { > r = -ENOMEM; > -- > 2.11.0 >
On Wed, 12 Jun 2019 01:08:36 +0530 Shyam Saini <shyam.saini@amarulasolutions.com> wrote: > Currently, there are 3 different macros, namely sizeof_field, SIZEOF_FIELD > and FIELD_SIZEOF which are used to calculate the size of a member of > structure, so to bring uniformity in entire kernel source tree lets use > FIELD_SIZEOF and replace all occurrences of other two macros with this. > > For this purpose, redefine FIELD_SIZEOF in include/linux/stddef.h and > tools/testing/selftests/bpf/bpf_util.h and remove its defination from > include/linux/kernel.h > > In favour of FIELD_SIZEOF, this patch also deprecates other two similar > macros sizeof_field and SIZEOF_FIELD. > > For code compatibility reason, retain sizeof_field macro as a wrapper macro > to FIELD_SIZEOF As Alexey has pointed out, C structs and unions don't have fields - they have members. So this is an opportunity to switch everything to a new member_sizeof(). What do people think of that and how does this impact the patch footprint?
On Jun 11, 2019, at 2:48 PM, Andrew Morton <akpm@linux-foundation.org> wrote: > > On Wed, 12 Jun 2019 01:08:36 +0530 Shyam Saini <shyam.saini@amarulasolutions.com> wrote: > >> Currently, there are 3 different macros, namely sizeof_field, SIZEOF_FIELD >> and FIELD_SIZEOF which are used to calculate the size of a member of >> structure, so to bring uniformity in entire kernel source tree lets use >> FIELD_SIZEOF and replace all occurrences of other two macros with this. >> >> For this purpose, redefine FIELD_SIZEOF in include/linux/stddef.h and >> tools/testing/selftests/bpf/bpf_util.h and remove its defination from >> include/linux/kernel.h >> >> In favour of FIELD_SIZEOF, this patch also deprecates other two similar >> macros sizeof_field and SIZEOF_FIELD. >> >> For code compatibility reason, retain sizeof_field macro as a wrapper macro >> to FIELD_SIZEOF > > As Alexey has pointed out, C structs and unions don't have fields - > they have members. So this is an opportunity to switch everything to > a new member_sizeof(). > > What do people think of that and how does this impact the patch footprint? I did a check, and FIELD_SIZEOF() is used about 350x, while sizeof_field() is about 30x, and SIZEOF_FIELD() is only about 5x. That said, I'm much more in favour of "sizeof_field()" or "sizeof_member()" than FIELD_SIZEOF(). Not only does that better match "offsetof()", with which it is closely related, but is also closer to the original "sizeof()". Since this is a rather trivial change, it can be split into a number of patches to get approval/landing via subsystem maintainers, and there is no huge urgency to remove the original macros until the users are gone. It would make sense to remove SIZEOF_FIELD() and sizeof_field() quickly so they don't gain more users, and the remaining FIELD_SIZEOF() users can be whittled away as the patches come through the maintainer trees. Cheers, Andreas
Hi Kees, Cc'ing William Kucharski, > On Wed, Jun 12, 2019 at 01:08:36AM +0530, Shyam Saini wrote: > > In favour of FIELD_SIZEOF, this patch also deprecates other two similar > > macros sizeof_field and SIZEOF_FIELD. > > > > For code compatibility reason, retain sizeof_field macro as a wrapper macro > > to FIELD_SIZEOF > > Can you explain this part? First sentence says you want to remove > sizeof_field, and the second says you're keeping it? I thought the point > was to switch all of these to FIELD_SIZEOF()? Previously, William [1] suggested to retain sizeof_field as macro to FIELD_SIZEOF for code compatibility reason. I have removed all the usage of sizeof_field apart from retained wrapper macro definition. [1] https://patchwork.ozlabs.org/patch/1085275/ Thanks, Shyam > > > > arch/arm64/include/asm/processor.h | 10 +++++----- > > arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 9 +-------- > > drivers/gpu/drm/i915/gvt/scheduler.c | 2 +- > > drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c | 4 ++-- > > fs/befs/linuxvfs.c | 2 +- > > fs/ext2/super.c | 2 +- > > fs/ext4/super.c | 2 +- > > fs/freevxfs/vxfs_super.c | 2 +- > > fs/orangefs/super.c | 2 +- > > fs/ufs/super.c | 2 +- > > include/linux/kernel.h | 9 --------- > > include/linux/slab.h | 2 +- > > include/linux/stddef.h | 17 ++++++++++++++--- > > kernel/fork.c | 2 +- > > kernel/utsname.c | 2 +- > > net/caif/caif_socket.c | 2 +- > > net/core/skbuff.c | 2 +- > > net/ipv4/raw.c | 2 +- > > net/ipv6/raw.c | 2 +- > > net/sctp/socket.c | 4 ++-- > > tools/testing/selftests/bpf/bpf_util.h | 22 +++++++++++++++++++--- > > virt/kvm/kvm_main.c | 2 +- > > 22 files changed, 58 insertions(+), 47 deletions(-) > > > > diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h > > index fcd0e691b1ea..ace906d887cc 100644 > > --- a/arch/arm64/include/asm/processor.h > > +++ b/arch/arm64/include/asm/processor.h > > @@ -164,13 +164,13 @@ static inline void arch_thread_struct_whitelist(unsigned long *offset, > > unsigned long *size) > > { > > /* Verify that there is no padding among the whitelisted fields: */ > > - BUILD_BUG_ON(sizeof_field(struct thread_struct, uw) != > > - sizeof_field(struct thread_struct, uw.tp_value) + > > - sizeof_field(struct thread_struct, uw.tp2_value) + > > - sizeof_field(struct thread_struct, uw.fpsimd_state)); > > + BUILD_BUG_ON(FIELD_SIZEOF(struct thread_struct, uw) != > > + FIELD_SIZEOF(struct thread_struct, uw.tp_value) + > > + FIELD_SIZEOF(struct thread_struct, uw.tp2_value) + > > + FIELD_SIZEOF(struct thread_struct, uw.fpsimd_state)); > > > > *offset = offsetof(struct thread_struct, uw); > > - *size = sizeof_field(struct thread_struct, uw); > > + *size = FIELD_SIZEOF(struct thread_struct, uw); > > } > > > > #ifdef CONFIG_COMPAT > > diff --git a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c > > index ba8f82a29a81..44b506a14666 100644 > > --- a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c > > +++ b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c > > @@ -45,13 +45,6 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc; > > /* See header file for descriptions of functions */ > > > > /** > > - * This macro returns the size of a member of a structure. > > - * Logically it is the same as "sizeof(s::field)" in C++, but > > - * C lacks the "::" operator. > > - */ > > -#define SIZEOF_FIELD(s, field) sizeof(((s *)NULL)->field) > > - > > -/** > > * This macro returns a member of the > > * cvmx_bootmem_named_block_desc_t structure. These members can't > > * be directly addressed as they might be in memory not directly > > @@ -65,7 +58,7 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc; > > #define CVMX_BOOTMEM_NAMED_GET_FIELD(addr, field) \ > > __cvmx_bootmem_desc_get(addr, \ > > offsetof(struct cvmx_bootmem_named_block_desc, field), \ > > - SIZEOF_FIELD(struct cvmx_bootmem_named_block_desc, field)) > > + FIELD_SIZEOF(struct cvmx_bootmem_named_block_desc, field)) > > > > /** > > * This function is the implementation of the get macros defined > > diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c > > index 0f919f0a43d4..820f95a52542 100644 > > --- a/drivers/gpu/drm/i915/gvt/scheduler.c > > +++ b/drivers/gpu/drm/i915/gvt/scheduler.c > > @@ -1243,7 +1243,7 @@ int intel_vgpu_setup_submission(struct intel_vgpu *vgpu) > > sizeof(struct intel_vgpu_workload), 0, > > SLAB_HWCACHE_ALIGN, > > offsetof(struct intel_vgpu_workload, rb_tail), > > - sizeof_field(struct intel_vgpu_workload, rb_tail), > > + FIELD_SIZEOF(struct intel_vgpu_workload, rb_tail), > > NULL); > > > > if (!s->workloads) { > > diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c > > index 46baf3b44309..c0447bf07fbb 100644 > > --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c > > +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c > > @@ -49,13 +49,13 @@ struct mlxsw_sp_fid_8021d { > > }; > > > > static const struct rhashtable_params mlxsw_sp_fid_ht_params = { > > - .key_len = sizeof_field(struct mlxsw_sp_fid, fid_index), > > + .key_len = FIELD_SIZEOF(struct mlxsw_sp_fid, fid_index), > > .key_offset = offsetof(struct mlxsw_sp_fid, fid_index), > > .head_offset = offsetof(struct mlxsw_sp_fid, ht_node), > > }; > > > > static const struct rhashtable_params mlxsw_sp_fid_vni_ht_params = { > > - .key_len = sizeof_field(struct mlxsw_sp_fid, vni), > > + .key_len = FIELD_SIZEOF(struct mlxsw_sp_fid, vni), > > .key_offset = offsetof(struct mlxsw_sp_fid, vni), > > .head_offset = offsetof(struct mlxsw_sp_fid, vni_ht_node), > > }; > > diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c > > index 462d096ff3e9..06ffd4829e2e 100644 > > --- a/fs/befs/linuxvfs.c > > +++ b/fs/befs/linuxvfs.c > > @@ -438,7 +438,7 @@ befs_init_inodecache(void) > > SLAB_ACCOUNT), > > offsetof(struct befs_inode_info, > > i_data.symlink), > > - sizeof_field(struct befs_inode_info, > > + FIELD_SIZEOF(struct befs_inode_info, > > i_data.symlink), > > init_once); > > if (befs_inode_cachep == NULL) > > diff --git a/fs/ext2/super.c b/fs/ext2/super.c > > index 1d7ab73b1014..d9a6c81f4a47 100644 > > --- a/fs/ext2/super.c > > +++ b/fs/ext2/super.c > > @@ -220,7 +220,7 @@ static int __init init_inodecache(void) > > (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| > > SLAB_ACCOUNT), > > offsetof(struct ext2_inode_info, i_data), > > - sizeof_field(struct ext2_inode_info, i_data), > > + FIELD_SIZEOF(struct ext2_inode_info, i_data), > > init_once); > > if (ext2_inode_cachep == NULL) > > return -ENOMEM; > > diff --git a/fs/ext4/super.c b/fs/ext4/super.c > > index 4079605d437a..b1b5856248bd 100644 > > --- a/fs/ext4/super.c > > +++ b/fs/ext4/super.c > > @@ -1148,7 +1148,7 @@ static int __init init_inodecache(void) > > (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| > > SLAB_ACCOUNT), > > offsetof(struct ext4_inode_info, i_data), > > - sizeof_field(struct ext4_inode_info, i_data), > > + FIELD_SIZEOF(struct ext4_inode_info, i_data), > > init_once); > > if (ext4_inode_cachep == NULL) > > return -ENOMEM; > > diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c > > index a89f68c3cbed..ffd22f85bbe0 100644 > > --- a/fs/freevxfs/vxfs_super.c > > +++ b/fs/freevxfs/vxfs_super.c > > @@ -329,7 +329,7 @@ vxfs_init(void) > > sizeof(struct vxfs_inode_info), 0, > > SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, > > offsetof(struct vxfs_inode_info, vii_immed.vi_immed), > > - sizeof_field(struct vxfs_inode_info, > > + FIELD_SIZEOF(struct vxfs_inode_info, > > vii_immed.vi_immed), > > NULL); > > if (!vxfs_inode_cachep) > > diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c > > index ee5efdc35cc1..30f625059ad9 100644 > > --- a/fs/orangefs/super.c > > +++ b/fs/orangefs/super.c > > @@ -646,7 +646,7 @@ int orangefs_inode_cache_initialize(void) > > ORANGEFS_CACHE_CREATE_FLAGS, > > offsetof(struct orangefs_inode_s, > > link_target), > > - sizeof_field(struct orangefs_inode_s, > > + FIELD_SIZEOF(struct orangefs_inode_s, > > link_target), > > orangefs_inode_cache_ctor); > > > > diff --git a/fs/ufs/super.c b/fs/ufs/super.c > > index 3d247c0d92aa..1e8bcd950f6d 100644 > > --- a/fs/ufs/super.c > > +++ b/fs/ufs/super.c > > @@ -1469,7 +1469,7 @@ static int __init init_inodecache(void) > > (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| > > SLAB_ACCOUNT), > > offsetof(struct ufs_inode_info, i_u1.i_symlink), > > - sizeof_field(struct ufs_inode_info, > > + FIELD_SIZEOF(struct ufs_inode_info, > > i_u1.i_symlink), > > init_once); > > if (ufs_inode_cachep == NULL) > > diff --git a/include/linux/kernel.h b/include/linux/kernel.h > > index 74b1ee9027f5..4672391cdb5b 100644 > > --- a/include/linux/kernel.h > > +++ b/include/linux/kernel.h > > @@ -79,15 +79,6 @@ > > */ > > #define round_down(x, y) ((x) & ~__round_mask(x, y)) > > > > -/** > > - * FIELD_SIZEOF - get the size of a struct's field > > - * @t: the target struct > > - * @f: the target struct's field > > - * Return: the size of @f in the struct definition without having a > > - * declared instance of @t. > > - */ > > -#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) > > - > > #define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP > > > > #define DIV_ROUND_DOWN_ULL(ll, d) \ > > diff --git a/include/linux/slab.h b/include/linux/slab.h > > index 9449b19c5f10..8bdfdd389b37 100644 > > --- a/include/linux/slab.h > > +++ b/include/linux/slab.h > > @@ -175,7 +175,7 @@ void memcg_destroy_kmem_caches(struct mem_cgroup *); > > sizeof(struct __struct), \ > > __alignof__(struct __struct), (__flags), \ > > offsetof(struct __struct, __field), \ > > - sizeof_field(struct __struct, __field), NULL) > > + FIELD_SIZEOF(struct __struct, __field), NULL) > > > > /* > > * Common kmalloc functions provided by all allocators > > diff --git a/include/linux/stddef.h b/include/linux/stddef.h > > index 998a4ba28eba..a5960e2b4a8b 100644 > > --- a/include/linux/stddef.h > > +++ b/include/linux/stddef.h > > @@ -20,12 +20,23 @@ enum { > > #endif > > > > /** > > - * sizeof_field(TYPE, MEMBER) > > + * FIELD_SIZEOF - get the size of a struct's field > > + * @t: the target struct > > + * @f: the target struct's field > > + * Return: the size of @f in the struct definition without having a > > + * declared instance of @t. > > + */ > > +#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f)) > > + > > +/* > > + * For code compatibility > > * > > + * sizeof_field(TYPE, MEMBER) > > * @TYPE: The structure containing the field of interest > > * @MEMBER: The field to return the size of > > */ > > -#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) > > + > > +#define sizeof_field(TYPE, MEMBER) FIELD_SIZEOF(TYPE, MEMBER) > > > > /** > > * offsetofend(TYPE, MEMBER) > > @@ -34,6 +45,6 @@ enum { > > * @MEMBER: The member within the structure to get the end offset of > > */ > > #define offsetofend(TYPE, MEMBER) \ > > - (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER)) > > + (offsetof(TYPE, MEMBER) + FIELD_SIZEOF(TYPE, MEMBER)) > > > > #endif > > diff --git a/kernel/fork.c b/kernel/fork.c > > index 75675b9bf6df..ef40b95bf82c 100644 > > --- a/kernel/fork.c > > +++ b/kernel/fork.c > > @@ -2553,7 +2553,7 @@ void __init proc_caches_init(void) > > mm_size, ARCH_MIN_MMSTRUCT_ALIGN, > > SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT, > > offsetof(struct mm_struct, saved_auxv), > > - sizeof_field(struct mm_struct, saved_auxv), > > + FIELD_SIZEOF(struct mm_struct, saved_auxv), > > NULL); > > vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC|SLAB_ACCOUNT); > > mmap_init(); > > diff --git a/kernel/utsname.c b/kernel/utsname.c > > index f0e491193009..28257c571553 100644 > > --- a/kernel/utsname.c > > +++ b/kernel/utsname.c > > @@ -174,6 +174,6 @@ void __init uts_ns_init(void) > > "uts_namespace", sizeof(struct uts_namespace), 0, > > SLAB_PANIC|SLAB_ACCOUNT, > > offsetof(struct uts_namespace, name), > > - sizeof_field(struct uts_namespace, name), > > + FIELD_SIZEOF(struct uts_namespace, name), > > NULL); > > } > > diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c > > index 13ea920600ae..3306bbed77eb 100644 > > --- a/net/caif/caif_socket.c > > +++ b/net/caif/caif_socket.c > > @@ -1033,7 +1033,7 @@ static int caif_create(struct net *net, struct socket *sock, int protocol, > > .owner = THIS_MODULE, > > .obj_size = sizeof(struct caifsock), > > .useroffset = offsetof(struct caifsock, conn_req.param), > > - .usersize = sizeof_field(struct caifsock, conn_req.param) > > + .usersize = FIELD_SIZEOF(struct caifsock, conn_req.param) > > }; > > > > if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN)) > > diff --git a/net/core/skbuff.c b/net/core/skbuff.c > > index 47c1aa9ee045..816bea0c4a8e 100644 > > --- a/net/core/skbuff.c > > +++ b/net/core/skbuff.c > > @@ -3983,7 +3983,7 @@ void __init skb_init(void) > > 0, > > SLAB_HWCACHE_ALIGN|SLAB_PANIC, > > offsetof(struct sk_buff, cb), > > - sizeof_field(struct sk_buff, cb), > > + FIELD_SIZEOF(struct sk_buff, cb), > > NULL); > > skbuff_fclone_cache = kmem_cache_create("skbuff_fclone_cache", > > sizeof(struct sk_buff_fclones), > > diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c > > index 0b8e06ca75d6..efa4c745f7b9 100644 > > --- a/net/ipv4/raw.c > > +++ b/net/ipv4/raw.c > > @@ -977,7 +977,7 @@ struct proto raw_prot = { > > .unhash = raw_unhash_sk, > > .obj_size = sizeof(struct raw_sock), > > .useroffset = offsetof(struct raw_sock, filter), > > - .usersize = sizeof_field(struct raw_sock, filter), > > + .usersize = FIELD_SIZEOF(struct raw_sock, filter), > > .h.raw_hash = &raw_v4_hashinfo, > > #ifdef CONFIG_COMPAT > > .compat_setsockopt = compat_raw_setsockopt, > > diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c > > index 70693bc7ad9d..257c71e22d74 100644 > > --- a/net/ipv6/raw.c > > +++ b/net/ipv6/raw.c > > @@ -1292,7 +1292,7 @@ struct proto rawv6_prot = { > > .unhash = raw_unhash_sk, > > .obj_size = sizeof(struct raw6_sock), > > .useroffset = offsetof(struct raw6_sock, filter), > > - .usersize = sizeof_field(struct raw6_sock, filter), > > + .usersize = FIELD_SIZEOF(struct raw6_sock, filter), > > .h.raw_hash = &raw_v6_hashinfo, > > #ifdef CONFIG_COMPAT > > .compat_setsockopt = compat_rawv6_setsockopt, > > diff --git a/net/sctp/socket.c b/net/sctp/socket.c > > index 39ea0a37af09..6b648a6033b9 100644 > > --- a/net/sctp/socket.c > > +++ b/net/sctp/socket.c > > @@ -9377,7 +9377,7 @@ struct proto sctp_prot = { > > .useroffset = offsetof(struct sctp_sock, subscribe), > > .usersize = offsetof(struct sctp_sock, initmsg) - > > offsetof(struct sctp_sock, subscribe) + > > - sizeof_field(struct sctp_sock, initmsg), > > + FIELD_SIZEOF(struct sctp_sock, initmsg), > > .sysctl_mem = sysctl_sctp_mem, > > .sysctl_rmem = sysctl_sctp_rmem, > > .sysctl_wmem = sysctl_sctp_wmem, > > @@ -9419,7 +9419,7 @@ struct proto sctpv6_prot = { > > .useroffset = offsetof(struct sctp6_sock, sctp.subscribe), > > .usersize = offsetof(struct sctp6_sock, sctp.initmsg) - > > offsetof(struct sctp6_sock, sctp.subscribe) + > > - sizeof_field(struct sctp6_sock, sctp.initmsg), > > + FIELD_SIZEOF(struct sctp6_sock, sctp.initmsg), > > .sysctl_mem = sysctl_sctp_mem, > > .sysctl_rmem = sysctl_sctp_rmem, > > .sysctl_wmem = sysctl_sctp_wmem, > > diff --git a/tools/testing/selftests/bpf/bpf_util.h b/tools/testing/selftests/bpf/bpf_util.h > > index a29206ebbd13..571c35aac90f 100644 > > --- a/tools/testing/selftests/bpf/bpf_util.h > > +++ b/tools/testing/selftests/bpf/bpf_util.h > > @@ -58,13 +58,29 @@ static inline unsigned int bpf_num_possible_cpus(void) > > # define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) > > #endif > > > > -#ifndef sizeof_field > > -#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) > > +/* > > + * FIELD_SIZEOF - get the size of a struct's field > > + * @t: the target struct > > + * @f: the target struct's field > > + * Return: the size of @f in the struct definition without having a > > + * declared instance of @t. > > + */ > > +#ifndef FIELD_SIZEOF > > +#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f)) > > #endif > > > > +/* > > + * For code compatibility > > + * > > + * sizeof_field(TYPE, MEMBER) > > + * @TYPE: The structure containing the field of interest > > + * @MEMBER: The field to return the size of > > + */ > > +#define sizeof_field(TYPE, MEMBER) FIELD_SIZEOF(TYPE, MEMBER) > > + > > #ifndef offsetofend > > #define offsetofend(TYPE, MEMBER) \ > > - (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER)) > > + (offsetof(TYPE, MEMBER) + FIELD_SIZEOF(TYPE, MEMBER)) > > #endif > > > > #endif /* __BPF_UTIL__ */ > > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > > index ca54b09adf5b..e43e3a26f6ab 100644 > > --- a/virt/kvm/kvm_main.c > > +++ b/virt/kvm/kvm_main.c > > @@ -4275,7 +4275,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, > > kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align, > > SLAB_ACCOUNT, > > offsetof(struct kvm_vcpu, arch), > > - sizeof_field(struct kvm_vcpu, arch), > > + FIELD_SIZEOF(struct kvm_vcpu, arch), > > NULL); > > if (!kvm_vcpu_cache) { > > r = -ENOMEM; > > -- > > 2.11.0 > > > > -- > Kees Cook
On Tue, 11 Jun 2019 15:00:10 -0600 Andreas Dilger <adilger@dilger.ca> wrote: > >> to FIELD_SIZEOF > > > > As Alexey has pointed out, C structs and unions don't have fields - > > they have members. So this is an opportunity to switch everything to > > a new member_sizeof(). > > > > What do people think of that and how does this impact the patch footprint? > > I did a check, and FIELD_SIZEOF() is used about 350x, while sizeof_field() > is about 30x, and SIZEOF_FIELD() is only about 5x. Erk. Sorry, I should have grepped. > That said, I'm much more in favour of "sizeof_field()" or "sizeof_member()" > than FIELD_SIZEOF(). Not only does that better match "offsetof()", with > which it is closely related, but is also closer to the original "sizeof()". > > Since this is a rather trivial change, it can be split into a number of > patches to get approval/landing via subsystem maintainers, and there is no > huge urgency to remove the original macros until the users are gone. It > would make sense to remove SIZEOF_FIELD() and sizeof_field() quickly so > they don't gain more users, and the remaining FIELD_SIZEOF() users can be > whittled away as the patches come through the maintainer trees. In that case I'd say let's live with FIELD_SIZEOF() and remove sizeof_field() and SIZEOF_FIELD(). I'm a bit surprised that the FIELD_SIZEOF() definition ends up in stddef.h rather than in kernel.h where such things are normally defined. Why is that?
Hi Andrew, > > On Tue, 11 Jun 2019 15:00:10 -0600 Andreas Dilger <adilger@dilger.ca> wrote: > > > >> to FIELD_SIZEOF > > > > > > As Alexey has pointed out, C structs and unions don't have fields - > > > they have members. So this is an opportunity to switch everything to > > > a new member_sizeof(). > > > > > > What do people think of that and how does this impact the patch footprint? > > > > I did a check, and FIELD_SIZEOF() is used about 350x, while sizeof_field() > > is about 30x, and SIZEOF_FIELD() is only about 5x. > > Erk. Sorry, I should have grepped. > > > That said, I'm much more in favour of "sizeof_field()" or "sizeof_member()" > > than FIELD_SIZEOF(). Not only does that better match "offsetof()", with > > which it is closely related, but is also closer to the original "sizeof()". > > > > Since this is a rather trivial change, it can be split into a number of > > patches to get approval/landing via subsystem maintainers, and there is no > > huge urgency to remove the original macros until the users are gone. It > > would make sense to remove SIZEOF_FIELD() and sizeof_field() quickly so > > they don't gain more users, and the remaining FIELD_SIZEOF() users can be > > whittled away as the patches come through the maintainer trees. > > In that case I'd say let's live with FIELD_SIZEOF() and remove > sizeof_field() and SIZEOF_FIELD(). > > I'm a bit surprised that the FIELD_SIZEOF() definition ends up in > stddef.h rather than in kernel.h where such things are normally > defined. Why is that? Thanks for pointing out this, I was not aware if this is a convention. Anyway, I'll keep FIELD_SIZEOF definition in kernel.h in next version.
On Jun 11, 2019, at 3:09 PM, Andrew Morton <akpm@linux-foundation.org> wrote: > > On Tue, 11 Jun 2019 15:00:10 -0600 Andreas Dilger <adilger@dilger.ca> wrote: > >>>> to FIELD_SIZEOF >>> >>> As Alexey has pointed out, C structs and unions don't have fields - >>> they have members. So this is an opportunity to switch everything to >>> a new member_sizeof(). >>> >>> What do people think of that and how does this impact the patch footprint? >> >> I did a check, and FIELD_SIZEOF() is used about 350x, while sizeof_field() >> is about 30x, and SIZEOF_FIELD() is only about 5x. > > Erk. Sorry, I should have grepped. > >> That said, I'm much more in favour of "sizeof_field()" or "sizeof_member()" >> than FIELD_SIZEOF(). Not only does that better match "offsetof()", with >> which it is closely related, but is also closer to the original "sizeof()". >> >> Since this is a rather trivial change, it can be split into a number of >> patches to get approval/landing via subsystem maintainers, and there is no >> huge urgency to remove the original macros until the users are gone. It >> would make sense to remove SIZEOF_FIELD() and sizeof_field() quickly so >> they don't gain more users, and the remaining FIELD_SIZEOF() users can be >> whittled away as the patches come through the maintainer trees. > > In that case I'd say let's live with FIELD_SIZEOF() and remove > sizeof_field() and SIZEOF_FIELD(). The real question is whether we want to live with a sub-standard macro for the next 20 years rather than taking the opportunity to clean it up now? > I'm a bit surprised that the FIELD_SIZEOF() definition ends up in > stddef.h rather than in kernel.h where such things are normally > defined. Why is that? Cheers, Andreas
On Tue, Jun 11, 2019 at 5:00 PM Shyam Saini <shyam.saini@amarulasolutions.com> wrote: > > Currently, there are 3 different macros, namely sizeof_field, SIZEOF_FIELD > and FIELD_SIZEOF which are used to calculate the size of a member of > structure, so to bring uniformity in entire kernel source tree lets use > FIELD_SIZEOF and replace all occurrences of other two macros with this. > > For this purpose, redefine FIELD_SIZEOF in include/linux/stddef.h and > tools/testing/selftests/bpf/bpf_util.h and remove its defination from > include/linux/kernel.h please dont. bpf_util.h is a user space header. Please leave it as-is.
On Tue, Jun 11, 2019 at 03:00:10PM -0600, Andreas Dilger wrote: > On Jun 11, 2019, at 2:48 PM, Andrew Morton <akpm@linux-foundation.org> wrote: > > > > On Wed, 12 Jun 2019 01:08:36 +0530 Shyam Saini <shyam.saini@amarulasolutions.com> wrote: > I did a check, and FIELD_SIZEOF() is used about 350x, while sizeof_field() > is about 30x, and SIZEOF_FIELD() is only about 5x. > > That said, I'm much more in favour of "sizeof_field()" or "sizeof_member()" > than FIELD_SIZEOF(). Not only does that better match "offsetof()", with > which it is closely related, but is also closer to the original "sizeof()". > > Since this is a rather trivial change, it can be split into a number of > patches to get approval/landing via subsystem maintainers, and there is no > huge urgency to remove the original macros until the users are gone. It > would make sense to remove SIZEOF_FIELD() and sizeof_field() quickly so > they don't gain more users, and the remaining FIELD_SIZEOF() users can be > whittled away as the patches come through the maintainer trees. The signature should be sizeof_member(T, m) it is proper English, it is lowercase, so is easier to type, it uses standard term (member, not field), it blends in with standard "sizeof" operator,
On Sat, 2019-06-29 at 17:25 +0300, Alexey Dobriyan wrote: > On Tue, Jun 11, 2019 at 03:00:10PM -0600, Andreas Dilger wrote: > > On Jun 11, 2019, at 2:48 PM, Andrew Morton <akpm@linux-foundation.org> wrote: > > > On Wed, 12 Jun 2019 01:08:36 +0530 Shyam Saini <shyam.saini@amarulasolutions.com> wrote: > > I did a check, and FIELD_SIZEOF() is used about 350x, while sizeof_field() > > is about 30x, and SIZEOF_FIELD() is only about 5x. > > > > That said, I'm much more in favour of "sizeof_field()" or "sizeof_member()" > > than FIELD_SIZEOF(). Not only does that better match "offsetof()", with > > which it is closely related, but is also closer to the original "sizeof()". > > > > Since this is a rather trivial change, it can be split into a number of > > patches to get approval/landing via subsystem maintainers, and there is no > > huge urgency to remove the original macros until the users are gone. It > > would make sense to remove SIZEOF_FIELD() and sizeof_field() quickly so > > they don't gain more users, and the remaining FIELD_SIZEOF() users can be > > whittled away as the patches come through the maintainer trees. > > The signature should be > > sizeof_member(T, m) > > it is proper English, > it is lowercase, so is easier to type, > it uses standard term (member, not field), > it blends in with standard "sizeof" operator, yes please. Also, a simple script conversion applied immediately after an rc1 might be easiest rather than individual patches.
On Sat, Jun 29, 2019 at 09:45:10AM -0700, Joe Perches wrote: > On Sat, 2019-06-29 at 17:25 +0300, Alexey Dobriyan wrote: > > On Tue, Jun 11, 2019 at 03:00:10PM -0600, Andreas Dilger wrote: > > > On Jun 11, 2019, at 2:48 PM, Andrew Morton <akpm@linux-foundation.org> wrote: > > > > On Wed, 12 Jun 2019 01:08:36 +0530 Shyam Saini <shyam.saini@amarulasolutions.com> wrote: > > > I did a check, and FIELD_SIZEOF() is used about 350x, while sizeof_field() > > > is about 30x, and SIZEOF_FIELD() is only about 5x. > > > > > > That said, I'm much more in favour of "sizeof_field()" or "sizeof_member()" > > > than FIELD_SIZEOF(). Not only does that better match "offsetof()", with > > > which it is closely related, but is also closer to the original "sizeof()". > > > > > > Since this is a rather trivial change, it can be split into a number of > > > patches to get approval/landing via subsystem maintainers, and there is no > > > huge urgency to remove the original macros until the users are gone. It > > > would make sense to remove SIZEOF_FIELD() and sizeof_field() quickly so > > > they don't gain more users, and the remaining FIELD_SIZEOF() users can be > > > whittled away as the patches come through the maintainer trees. > > > > The signature should be > > > > sizeof_member(T, m) > > > > it is proper English, > > it is lowercase, so is easier to type, > > it uses standard term (member, not field), > > it blends in with standard "sizeof" operator, > > yes please. > > Also, a simple script conversion applied > immediately after an rc1 might be easiest > rather than individual patches. This seems reasonable to me. I think the patch steps would be: 1) implement sizeof_member(T, m) as a stand-alone macro 2) do a scripted replacement of all identical macros. 3) remove all the identical macros. Step 2 can be a patch that includes the script used to do the replacement. That way Linus can choose to just run the script instead of taking the patch.
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h index fcd0e691b1ea..ace906d887cc 100644 --- a/arch/arm64/include/asm/processor.h +++ b/arch/arm64/include/asm/processor.h @@ -164,13 +164,13 @@ static inline void arch_thread_struct_whitelist(unsigned long *offset, unsigned long *size) { /* Verify that there is no padding among the whitelisted fields: */ - BUILD_BUG_ON(sizeof_field(struct thread_struct, uw) != - sizeof_field(struct thread_struct, uw.tp_value) + - sizeof_field(struct thread_struct, uw.tp2_value) + - sizeof_field(struct thread_struct, uw.fpsimd_state)); + BUILD_BUG_ON(FIELD_SIZEOF(struct thread_struct, uw) != + FIELD_SIZEOF(struct thread_struct, uw.tp_value) + + FIELD_SIZEOF(struct thread_struct, uw.tp2_value) + + FIELD_SIZEOF(struct thread_struct, uw.fpsimd_state)); *offset = offsetof(struct thread_struct, uw); - *size = sizeof_field(struct thread_struct, uw); + *size = FIELD_SIZEOF(struct thread_struct, uw); } #ifdef CONFIG_COMPAT diff --git a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c index ba8f82a29a81..44b506a14666 100644 --- a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c +++ b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c @@ -45,13 +45,6 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc; /* See header file for descriptions of functions */ /** - * This macro returns the size of a member of a structure. - * Logically it is the same as "sizeof(s::field)" in C++, but - * C lacks the "::" operator. - */ -#define SIZEOF_FIELD(s, field) sizeof(((s *)NULL)->field) - -/** * This macro returns a member of the * cvmx_bootmem_named_block_desc_t structure. These members can't * be directly addressed as they might be in memory not directly @@ -65,7 +58,7 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc; #define CVMX_BOOTMEM_NAMED_GET_FIELD(addr, field) \ __cvmx_bootmem_desc_get(addr, \ offsetof(struct cvmx_bootmem_named_block_desc, field), \ - SIZEOF_FIELD(struct cvmx_bootmem_named_block_desc, field)) + FIELD_SIZEOF(struct cvmx_bootmem_named_block_desc, field)) /** * This function is the implementation of the get macros defined diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c index 0f919f0a43d4..820f95a52542 100644 --- a/drivers/gpu/drm/i915/gvt/scheduler.c +++ b/drivers/gpu/drm/i915/gvt/scheduler.c @@ -1243,7 +1243,7 @@ int intel_vgpu_setup_submission(struct intel_vgpu *vgpu) sizeof(struct intel_vgpu_workload), 0, SLAB_HWCACHE_ALIGN, offsetof(struct intel_vgpu_workload, rb_tail), - sizeof_field(struct intel_vgpu_workload, rb_tail), + FIELD_SIZEOF(struct intel_vgpu_workload, rb_tail), NULL); if (!s->workloads) { diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c index 46baf3b44309..c0447bf07fbb 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c @@ -49,13 +49,13 @@ struct mlxsw_sp_fid_8021d { }; static const struct rhashtable_params mlxsw_sp_fid_ht_params = { - .key_len = sizeof_field(struct mlxsw_sp_fid, fid_index), + .key_len = FIELD_SIZEOF(struct mlxsw_sp_fid, fid_index), .key_offset = offsetof(struct mlxsw_sp_fid, fid_index), .head_offset = offsetof(struct mlxsw_sp_fid, ht_node), }; static const struct rhashtable_params mlxsw_sp_fid_vni_ht_params = { - .key_len = sizeof_field(struct mlxsw_sp_fid, vni), + .key_len = FIELD_SIZEOF(struct mlxsw_sp_fid, vni), .key_offset = offsetof(struct mlxsw_sp_fid, vni), .head_offset = offsetof(struct mlxsw_sp_fid, vni_ht_node), }; diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c index 462d096ff3e9..06ffd4829e2e 100644 --- a/fs/befs/linuxvfs.c +++ b/fs/befs/linuxvfs.c @@ -438,7 +438,7 @@ befs_init_inodecache(void) SLAB_ACCOUNT), offsetof(struct befs_inode_info, i_data.symlink), - sizeof_field(struct befs_inode_info, + FIELD_SIZEOF(struct befs_inode_info, i_data.symlink), init_once); if (befs_inode_cachep == NULL) diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 1d7ab73b1014..d9a6c81f4a47 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -220,7 +220,7 @@ static int __init init_inodecache(void) (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| SLAB_ACCOUNT), offsetof(struct ext2_inode_info, i_data), - sizeof_field(struct ext2_inode_info, i_data), + FIELD_SIZEOF(struct ext2_inode_info, i_data), init_once); if (ext2_inode_cachep == NULL) return -ENOMEM; diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 4079605d437a..b1b5856248bd 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1148,7 +1148,7 @@ static int __init init_inodecache(void) (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| SLAB_ACCOUNT), offsetof(struct ext4_inode_info, i_data), - sizeof_field(struct ext4_inode_info, i_data), + FIELD_SIZEOF(struct ext4_inode_info, i_data), init_once); if (ext4_inode_cachep == NULL) return -ENOMEM; diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c index a89f68c3cbed..ffd22f85bbe0 100644 --- a/fs/freevxfs/vxfs_super.c +++ b/fs/freevxfs/vxfs_super.c @@ -329,7 +329,7 @@ vxfs_init(void) sizeof(struct vxfs_inode_info), 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, offsetof(struct vxfs_inode_info, vii_immed.vi_immed), - sizeof_field(struct vxfs_inode_info, + FIELD_SIZEOF(struct vxfs_inode_info, vii_immed.vi_immed), NULL); if (!vxfs_inode_cachep) diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c index ee5efdc35cc1..30f625059ad9 100644 --- a/fs/orangefs/super.c +++ b/fs/orangefs/super.c @@ -646,7 +646,7 @@ int orangefs_inode_cache_initialize(void) ORANGEFS_CACHE_CREATE_FLAGS, offsetof(struct orangefs_inode_s, link_target), - sizeof_field(struct orangefs_inode_s, + FIELD_SIZEOF(struct orangefs_inode_s, link_target), orangefs_inode_cache_ctor); diff --git a/fs/ufs/super.c b/fs/ufs/super.c index 3d247c0d92aa..1e8bcd950f6d 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -1469,7 +1469,7 @@ static int __init init_inodecache(void) (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| SLAB_ACCOUNT), offsetof(struct ufs_inode_info, i_u1.i_symlink), - sizeof_field(struct ufs_inode_info, + FIELD_SIZEOF(struct ufs_inode_info, i_u1.i_symlink), init_once); if (ufs_inode_cachep == NULL) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 74b1ee9027f5..4672391cdb5b 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -79,15 +79,6 @@ */ #define round_down(x, y) ((x) & ~__round_mask(x, y)) -/** - * FIELD_SIZEOF - get the size of a struct's field - * @t: the target struct - * @f: the target struct's field - * Return: the size of @f in the struct definition without having a - * declared instance of @t. - */ -#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) - #define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP #define DIV_ROUND_DOWN_ULL(ll, d) \ diff --git a/include/linux/slab.h b/include/linux/slab.h index 9449b19c5f10..8bdfdd389b37 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -175,7 +175,7 @@ void memcg_destroy_kmem_caches(struct mem_cgroup *); sizeof(struct __struct), \ __alignof__(struct __struct), (__flags), \ offsetof(struct __struct, __field), \ - sizeof_field(struct __struct, __field), NULL) + FIELD_SIZEOF(struct __struct, __field), NULL) /* * Common kmalloc functions provided by all allocators diff --git a/include/linux/stddef.h b/include/linux/stddef.h index 998a4ba28eba..a5960e2b4a8b 100644 --- a/include/linux/stddef.h +++ b/include/linux/stddef.h @@ -20,12 +20,23 @@ enum { #endif /** - * sizeof_field(TYPE, MEMBER) + * FIELD_SIZEOF - get the size of a struct's field + * @t: the target struct + * @f: the target struct's field + * Return: the size of @f in the struct definition without having a + * declared instance of @t. + */ +#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f)) + +/* + * For code compatibility * + * sizeof_field(TYPE, MEMBER) * @TYPE: The structure containing the field of interest * @MEMBER: The field to return the size of */ -#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) + +#define sizeof_field(TYPE, MEMBER) FIELD_SIZEOF(TYPE, MEMBER) /** * offsetofend(TYPE, MEMBER) @@ -34,6 +45,6 @@ enum { * @MEMBER: The member within the structure to get the end offset of */ #define offsetofend(TYPE, MEMBER) \ - (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER)) + (offsetof(TYPE, MEMBER) + FIELD_SIZEOF(TYPE, MEMBER)) #endif diff --git a/kernel/fork.c b/kernel/fork.c index 75675b9bf6df..ef40b95bf82c 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2553,7 +2553,7 @@ void __init proc_caches_init(void) mm_size, ARCH_MIN_MMSTRUCT_ALIGN, SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT, offsetof(struct mm_struct, saved_auxv), - sizeof_field(struct mm_struct, saved_auxv), + FIELD_SIZEOF(struct mm_struct, saved_auxv), NULL); vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC|SLAB_ACCOUNT); mmap_init(); diff --git a/kernel/utsname.c b/kernel/utsname.c index f0e491193009..28257c571553 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -174,6 +174,6 @@ void __init uts_ns_init(void) "uts_namespace", sizeof(struct uts_namespace), 0, SLAB_PANIC|SLAB_ACCOUNT, offsetof(struct uts_namespace, name), - sizeof_field(struct uts_namespace, name), + FIELD_SIZEOF(struct uts_namespace, name), NULL); } diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c index 13ea920600ae..3306bbed77eb 100644 --- a/net/caif/caif_socket.c +++ b/net/caif/caif_socket.c @@ -1033,7 +1033,7 @@ static int caif_create(struct net *net, struct socket *sock, int protocol, .owner = THIS_MODULE, .obj_size = sizeof(struct caifsock), .useroffset = offsetof(struct caifsock, conn_req.param), - .usersize = sizeof_field(struct caifsock, conn_req.param) + .usersize = FIELD_SIZEOF(struct caifsock, conn_req.param) }; if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN)) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 47c1aa9ee045..816bea0c4a8e 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3983,7 +3983,7 @@ void __init skb_init(void) 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, offsetof(struct sk_buff, cb), - sizeof_field(struct sk_buff, cb), + FIELD_SIZEOF(struct sk_buff, cb), NULL); skbuff_fclone_cache = kmem_cache_create("skbuff_fclone_cache", sizeof(struct sk_buff_fclones), diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 0b8e06ca75d6..efa4c745f7b9 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -977,7 +977,7 @@ struct proto raw_prot = { .unhash = raw_unhash_sk, .obj_size = sizeof(struct raw_sock), .useroffset = offsetof(struct raw_sock, filter), - .usersize = sizeof_field(struct raw_sock, filter), + .usersize = FIELD_SIZEOF(struct raw_sock, filter), .h.raw_hash = &raw_v4_hashinfo, #ifdef CONFIG_COMPAT .compat_setsockopt = compat_raw_setsockopt, diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index 70693bc7ad9d..257c71e22d74 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -1292,7 +1292,7 @@ struct proto rawv6_prot = { .unhash = raw_unhash_sk, .obj_size = sizeof(struct raw6_sock), .useroffset = offsetof(struct raw6_sock, filter), - .usersize = sizeof_field(struct raw6_sock, filter), + .usersize = FIELD_SIZEOF(struct raw6_sock, filter), .h.raw_hash = &raw_v6_hashinfo, #ifdef CONFIG_COMPAT .compat_setsockopt = compat_rawv6_setsockopt, diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 39ea0a37af09..6b648a6033b9 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -9377,7 +9377,7 @@ struct proto sctp_prot = { .useroffset = offsetof(struct sctp_sock, subscribe), .usersize = offsetof(struct sctp_sock, initmsg) - offsetof(struct sctp_sock, subscribe) + - sizeof_field(struct sctp_sock, initmsg), + FIELD_SIZEOF(struct sctp_sock, initmsg), .sysctl_mem = sysctl_sctp_mem, .sysctl_rmem = sysctl_sctp_rmem, .sysctl_wmem = sysctl_sctp_wmem, @@ -9419,7 +9419,7 @@ struct proto sctpv6_prot = { .useroffset = offsetof(struct sctp6_sock, sctp.subscribe), .usersize = offsetof(struct sctp6_sock, sctp.initmsg) - offsetof(struct sctp6_sock, sctp.subscribe) + - sizeof_field(struct sctp6_sock, sctp.initmsg), + FIELD_SIZEOF(struct sctp6_sock, sctp.initmsg), .sysctl_mem = sysctl_sctp_mem, .sysctl_rmem = sysctl_sctp_rmem, .sysctl_wmem = sysctl_sctp_wmem, diff --git a/tools/testing/selftests/bpf/bpf_util.h b/tools/testing/selftests/bpf/bpf_util.h index a29206ebbd13..571c35aac90f 100644 --- a/tools/testing/selftests/bpf/bpf_util.h +++ b/tools/testing/selftests/bpf/bpf_util.h @@ -58,13 +58,29 @@ static inline unsigned int bpf_num_possible_cpus(void) # define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) #endif -#ifndef sizeof_field -#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) +/* + * FIELD_SIZEOF - get the size of a struct's field + * @t: the target struct + * @f: the target struct's field + * Return: the size of @f in the struct definition without having a + * declared instance of @t. + */ +#ifndef FIELD_SIZEOF +#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f)) #endif +/* + * For code compatibility + * + * sizeof_field(TYPE, MEMBER) + * @TYPE: The structure containing the field of interest + * @MEMBER: The field to return the size of + */ +#define sizeof_field(TYPE, MEMBER) FIELD_SIZEOF(TYPE, MEMBER) + #ifndef offsetofend #define offsetofend(TYPE, MEMBER) \ - (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER)) + (offsetof(TYPE, MEMBER) + FIELD_SIZEOF(TYPE, MEMBER)) #endif #endif /* __BPF_UTIL__ */ diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index ca54b09adf5b..e43e3a26f6ab 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4275,7 +4275,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align, SLAB_ACCOUNT, offsetof(struct kvm_vcpu, arch), - sizeof_field(struct kvm_vcpu, arch), + FIELD_SIZEOF(struct kvm_vcpu, arch), NULL); if (!kvm_vcpu_cache) { r = -ENOMEM;
Currently, there are 3 different macros, namely sizeof_field, SIZEOF_FIELD and FIELD_SIZEOF which are used to calculate the size of a member of structure, so to bring uniformity in entire kernel source tree lets use FIELD_SIZEOF and replace all occurrences of other two macros with this. For this purpose, redefine FIELD_SIZEOF in include/linux/stddef.h and tools/testing/selftests/bpf/bpf_util.h and remove its defination from include/linux/kernel.h In favour of FIELD_SIZEOF, this patch also deprecates other two similar macros sizeof_field and SIZEOF_FIELD. For code compatibility reason, retain sizeof_field macro as a wrapper macro to FIELD_SIZEOF Signed-off-by: Shyam Saini <shyam.saini@amarulasolutions.com> --- Changelog: V1->V2 - Consolidate previous patch 1 and 2 into single patch - For code compatibility reason, retain sizeof_field macro as a wrapper macro to FIELD_SIZEOF arch/arm64/include/asm/processor.h | 10 +++++----- arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 9 +-------- drivers/gpu/drm/i915/gvt/scheduler.c | 2 +- drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c | 4 ++-- fs/befs/linuxvfs.c | 2 +- fs/ext2/super.c | 2 +- fs/ext4/super.c | 2 +- fs/freevxfs/vxfs_super.c | 2 +- fs/orangefs/super.c | 2 +- fs/ufs/super.c | 2 +- include/linux/kernel.h | 9 --------- include/linux/slab.h | 2 +- include/linux/stddef.h | 17 ++++++++++++++--- kernel/fork.c | 2 +- kernel/utsname.c | 2 +- net/caif/caif_socket.c | 2 +- net/core/skbuff.c | 2 +- net/ipv4/raw.c | 2 +- net/ipv6/raw.c | 2 +- net/sctp/socket.c | 4 ++-- tools/testing/selftests/bpf/bpf_util.h | 22 +++++++++++++++++++--- virt/kvm/kvm_main.c | 2 +- 22 files changed, 58 insertions(+), 47 deletions(-)