| Message ID | 1588734423-33988-1-git-send-email-zou_wei@huawei.com (mailing list archive) |
|---|---|
| State | Rejected |
| Delegated to: | Luca Coelho |
| Headers | show |
| Series | [-next] iwlwifi: pcie: Use bitwise instead of arithmetic operator for flags | expand |
On Wed, 2020-05-06 at 11:07 +0800, Samuel Zou wrote: > This silences the following coccinelle warning: > > "WARNING: sum of probable bitmasks, consider |" I suggest instead ignoring bad and irrelevant warnings. PREFIX_LEN is 32 not 0x20 or BIT(5) PCI_DUMP_SIZE is 352 > diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c [] > @@ -109,9 +109,9 @@ void iwl_trans_pcie_dump_regs(struct iwl_trans *trans) > > /* Alloc a max size buffer */ > alloc_size = PCI_ERR_ROOT_ERR_SRC + 4 + PREFIX_LEN; > - alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE + PREFIX_LEN); > - alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE + PREFIX_LEN); > - alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE + PREFIX_LEN); > + alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE | PREFIX_LEN); > + alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE | PREFIX_LEN); > + alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE | PREFIX_LEN); > > buf = kmalloc(alloc_size, GFP_ATOMIC); > if (!buf)
On Tue, 2020-05-05 at 20:19 -0700, Joe Perches wrote: > On Wed, 2020-05-06 at 11:07 +0800, Samuel Zou wrote: > > This silences the following coccinelle warning: > > > > "WARNING: sum of probable bitmasks, consider |" > > I suggest instead ignoring bad and irrelevant warnings. > > PREFIX_LEN is 32 not 0x20 or BIT(5) > PCI_DUMP_SIZE is 352 > > > diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c > [] > > @@ -109,9 +109,9 @@ void iwl_trans_pcie_dump_regs(struct iwl_trans *trans) > > > > /* Alloc a max size buffer */ > > alloc_size = PCI_ERR_ROOT_ERR_SRC + 4 + PREFIX_LEN; > > - alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE + PREFIX_LEN); > > - alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE + PREFIX_LEN); > > - alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE + PREFIX_LEN); > > + alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE | PREFIX_LEN); > > + alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE | PREFIX_LEN); > > + alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE | PREFIX_LEN); > > > > buf = kmalloc(alloc_size, GFP_ATOMIC); > > if (!buf) Yeah, those macros are clearly not bitmasks. I'm dropping this patch. -- Cheers, Luca.
On Wed, 2020-05-06 at 16:51 +0300, Luciano Coelho wrote: > On Tue, 2020-05-05 at 20:19 -0700, Joe Perches wrote: > > On Wed, 2020-05-06 at 11:07 +0800, Samuel Zou wrote: > > > This silences the following coccinelle warning: > > > > > > "WARNING: sum of probable bitmasks, consider |" > > > > I suggest instead ignoring bad and irrelevant warnings. > > > > PREFIX_LEN is 32 not 0x20 or BIT(5) > > PCI_DUMP_SIZE is 352 > > > > > diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c > > [] > > > @@ -109,9 +109,9 @@ void iwl_trans_pcie_dump_regs(struct iwl_trans *trans) > > > > > > /* Alloc a max size buffer */ > > > alloc_size = PCI_ERR_ROOT_ERR_SRC + 4 + PREFIX_LEN; > > > - alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE + PREFIX_LEN); > > > - alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE + PREFIX_LEN); > > > - alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE + PREFIX_LEN); > > > + alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE | PREFIX_LEN); > > > + alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE | PREFIX_LEN); > > > + alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE | PREFIX_LEN); > > > > > > buf = kmalloc(alloc_size, GFP_ATOMIC); > > > if (!buf) > > Yeah, those macros are clearly not bitmasks. I'm dropping this patch. Can the cocci script that generated this warning scripts/coccinelle/misc/orplus.cocci be dropped or improved to validate the likelihood that the defines or constants used are more likely than not are bit values? Maybe these should be defined as hex or BIT or BIT_ULL or GENMASK or the like? Right now it seems it just tests for two constants.
Both of you are right. I neglected, and this patch is wrong. Thanks. On 2020/5/6 23:15, Joe Perches wrote: > On Wed, 2020-05-06 at 16:51 +0300, Luciano Coelho wrote: >> On Tue, 2020-05-05 at 20:19 -0700, Joe Perches wrote: >>> On Wed, 2020-05-06 at 11:07 +0800, Samuel Zou wrote: >>>> This silences the following coccinelle warning: >>>> >>>> "WARNING: sum of probable bitmasks, consider |" >>> >>> I suggest instead ignoring bad and irrelevant warnings. >>> >>> PREFIX_LEN is 32 not 0x20 or BIT(5) >>> PCI_DUMP_SIZE is 352 >>> >>>> diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c >>> [] >>>> @@ -109,9 +109,9 @@ void iwl_trans_pcie_dump_regs(struct iwl_trans *trans) >>>> >>>> /* Alloc a max size buffer */ >>>> alloc_size = PCI_ERR_ROOT_ERR_SRC + 4 + PREFIX_LEN; >>>> - alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE + PREFIX_LEN); >>>> - alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE + PREFIX_LEN); >>>> - alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE + PREFIX_LEN); >>>> + alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE | PREFIX_LEN); >>>> + alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE | PREFIX_LEN); >>>> + alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE | PREFIX_LEN); >>>> >>>> buf = kmalloc(alloc_size, GFP_ATOMIC); >>>> if (!buf) >> >> Yeah, those macros are clearly not bitmasks. I'm dropping this patch. > > Can the cocci script that generated this warning > > scripts/coccinelle/misc/orplus.cocci > > be dropped or improved to validate the likelihood that > the defines or constants used are more likely than > not are bit values? > > Maybe these should be defined as hex or BIT or BIT_ULL > or GENMASK or the like? > > > Right now it seems it just tests for two constants. > > > > . >
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c index a0daae0..6d9bf9f 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c @@ -109,9 +109,9 @@ void iwl_trans_pcie_dump_regs(struct iwl_trans *trans) /* Alloc a max size buffer */ alloc_size = PCI_ERR_ROOT_ERR_SRC + 4 + PREFIX_LEN; - alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE + PREFIX_LEN); - alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE + PREFIX_LEN); - alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE + PREFIX_LEN); + alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE | PREFIX_LEN); + alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE | PREFIX_LEN); + alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE | PREFIX_LEN); buf = kmalloc(alloc_size, GFP_ATOMIC); if (!buf)
This silences the following coccinelle warning: "WARNING: sum of probable bitmasks, consider |" Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Samuel Zou <zou_wei@huawei.com> --- drivers/net/wireless/intel/iwlwifi/pcie/trans.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)