| Message ID | 20220603101411.488970-7-anshuman.khandual@arm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm/mmap: Enable more platforms with ARCH_HAS_VM_GET_PAGE_PROT | expand |
On Fri, Jun 03, 2022 at 03:44:11PM +0530, Anshuman Khandual wrote: > This defines and exports a platform specific custom vm_get_page_prot() via > subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX > macros can be dropped which are no longer needed. > > Cc: Jonas Bonn <jonas@southpole.se> > Cc: openrisc@lists.librecores.org > Cc: linux-kernel@vger.kernel.org > Acked-by: Stafford Horne <shorne@gmail.com> > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Is it possible to retract my Acked-by? I was following the discussion of this new function actually being sub optimal. So as far as I am concerned all these architecture patches should be nak'ed. -Stafford
On 6/5/22 11:37, Stafford Horne wrote: > On Fri, Jun 03, 2022 at 03:44:11PM +0530, Anshuman Khandual wrote: >> This defines and exports a platform specific custom vm_get_page_prot() via >> subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX >> macros can be dropped which are no longer needed. >> >> Cc: Jonas Bonn <jonas@southpole.se> >> Cc: openrisc@lists.librecores.org >> Cc: linux-kernel@vger.kernel.org >> Acked-by: Stafford Horne <shorne@gmail.com> >> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > > Is it possible to retract my Acked-by? I was following the discussion of this > new function actually being sub optimal. So as far as I am concerned all these > architecture patches should be nak'ed. Sure, alright. I am planning to redo these arch patches via making the protection_map[] array private to the platforms but possibly with a common look up function as Christophe had suggested earlier.
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig index e814df4c483c..fe0dfb50eb86 100644 --- a/arch/openrisc/Kconfig +++ b/arch/openrisc/Kconfig @@ -10,6 +10,7 @@ config OPENRISC select ARCH_HAS_DMA_SET_UNCACHED select ARCH_HAS_DMA_CLEAR_UNCACHED select ARCH_HAS_SYNC_DMA_FOR_DEVICE + select ARCH_HAS_VM_GET_PAGE_PROT select COMMON_CLK select OF select OF_EARLY_FLATTREE diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h index c3abbf71e09f..dcae8aea132f 100644 --- a/arch/openrisc/include/asm/pgtable.h +++ b/arch/openrisc/include/asm/pgtable.h @@ -176,24 +176,6 @@ extern void paging_init(void); __pgprot(_PAGE_ALL | _PAGE_SRE | _PAGE_SWE \ | _PAGE_SHARED | _PAGE_DIRTY | _PAGE_EXEC | _PAGE_CI) -#define __P000 PAGE_NONE -#define __P001 PAGE_READONLY_X -#define __P010 PAGE_COPY -#define __P011 PAGE_COPY_X -#define __P100 PAGE_READONLY -#define __P101 PAGE_READONLY_X -#define __P110 PAGE_COPY -#define __P111 PAGE_COPY_X - -#define __S000 PAGE_NONE -#define __S001 PAGE_READONLY_X -#define __S010 PAGE_SHARED -#define __S011 PAGE_SHARED_X -#define __S100 PAGE_READONLY -#define __S101 PAGE_READONLY_X -#define __S110 PAGE_SHARED -#define __S111 PAGE_SHARED_X - /* zero page used for uninitialized stuff */ extern unsigned long empty_zero_page[2048]; #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c index 3a021ab6f1ae..266dc68c32e5 100644 --- a/arch/openrisc/mm/init.c +++ b/arch/openrisc/mm/init.c @@ -208,3 +208,44 @@ void __init mem_init(void) mem_init_done = 1; return; } + +pgprot_t vm_get_page_prot(unsigned long vm_flags) +{ + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) { + case VM_NONE: + return PAGE_NONE; + case VM_READ: + return PAGE_READONLY_X; + case VM_WRITE: + return PAGE_COPY; + case VM_WRITE | VM_READ: + return PAGE_COPY_X; + case VM_EXEC: + return PAGE_READONLY; + case VM_EXEC | VM_READ: + return PAGE_READONLY_X; + case VM_EXEC | VM_WRITE: + return PAGE_COPY; + case VM_EXEC | VM_WRITE | VM_READ: + return PAGE_COPY_X; + case VM_SHARED: + return PAGE_NONE; + case VM_SHARED | VM_READ: + return PAGE_READONLY_X; + case VM_SHARED | VM_WRITE: + return PAGE_SHARED; + case VM_SHARED | VM_WRITE | VM_READ: + return PAGE_SHARED_X; + case VM_SHARED | VM_EXEC: + return PAGE_READONLY; + case VM_SHARED | VM_EXEC | VM_READ: + return PAGE_READONLY_X; + case VM_SHARED | VM_EXEC | VM_WRITE: + return PAGE_SHARED; + case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ: + return PAGE_SHARED_X; + default: + BUILD_BUG(); + } +} +EXPORT_SYMBOL(vm_get_page_prot);