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mm/gup: Drop the arch_pte_access_permitted() MMU callback

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The only arch that defines it to something meaningful is x86.
But x86 doesn't use the generic GUP_fast() implementation -- the
only place where the callback is called.

Let's drop it.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Aneesh Kumar K . V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dann Frazier <dann.frazier@canonical.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20170316152655.37789-2-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill A. Shutemov 2017-03-16 18:26:49 +03:00 committed by Ingo Molnar
parent f991376e44
commit 9a804fecee
7 changed files with 0 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/powerpc/include/asm/mmu_context.h
View File

@ -163,11 +163,5 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
/* by default, allow everything */
return true;
}
static inline bool arch_pte_access_permitted(pte_t pte, bool write)
{
/* by default, allow everything */
return true;
}
#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_MMU_CONTEXT_H */

6
arch/s390/include/asm/mmu_context.h
View File

@ -156,10 +156,4 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
/* by default, allow everything */
return true;
}
static inline bool arch_pte_access_permitted(pte_t pte, bool write)
{
/* by default, allow everything */
return true;
}
#endif /* __S390_MMU_CONTEXT_H */

6
arch/um/include/asm/mmu_context.h
View File

@ -37,12 +37,6 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
return true;
}
static inline bool arch_pte_access_permitted(pte_t pte, bool write)
{
/* by default, allow everything */
return true;
}
/*
* end asm-generic/mm_hooks.h functions
*/

6
arch/unicore32/include/asm/mmu_context.h
View File

@ -103,10 +103,4 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
/* by default, allow everything */
return true;
}
static inline bool arch_pte_access_permitted(pte_t pte, bool write)
{
/* by default, allow everything */
return true;
}
#endif

4
arch/x86/include/asm/mmu_context.h
View File

@ -268,8 +268,4 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
return __pkru_allows_pkey(vma_pkey(vma), write);
}
static inline bool arch_pte_access_permitted(pte_t pte, bool write)
{
return __pkru_allows_pkey(pte_flags_pkey(pte_flags(pte)), write);
}
#endif /* _ASM_X86_MMU_CONTEXT_H */

6
include/asm-generic/mm_hooks.h
View File

@ -32,10 +32,4 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
/* by default, allow everything */
return true;
}
static inline bool arch_pte_access_permitted(pte_t pte, bool write)
{
/* by default, allow everything */
return true;
}
#endif /* _ASM_GENERIC_MM_HOOKS_H */

3
mm/gup.c
View File

@ -1216,9 +1216,6 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
pte_protnone(pte) || (write && !pte_write(pte)))
goto pte_unmap;
if (!arch_pte_access_permitted(pte, write))
goto pte_unmap;
VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
page = pte_page(pte);
head = compound_head(page);