mm/gup: Drop the arch_pte_access_permitted() MMU callback
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>
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@ -163,11 +163,5 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
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/* by default, allow everything */
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return true;
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}
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static inline bool arch_pte_access_permitted(pte_t pte, bool write)
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{
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/* by default, allow everything */
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return true;
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}
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#endif /* __KERNEL__ */
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#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
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@ -156,10 +156,4 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
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/* by default, allow everything */
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return true;
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}
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static inline bool arch_pte_access_permitted(pte_t pte, bool write)
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{
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/* by default, allow everything */
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return true;
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}
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#endif /* __S390_MMU_CONTEXT_H */
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@ -37,12 +37,6 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
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return true;
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}
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static inline bool arch_pte_access_permitted(pte_t pte, bool write)
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{
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/* by default, allow everything */
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return true;
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}
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/*
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* end asm-generic/mm_hooks.h functions
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*/
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@ -103,10 +103,4 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
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/* by default, allow everything */
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return true;
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}
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static inline bool arch_pte_access_permitted(pte_t pte, bool write)
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{
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/* by default, allow everything */
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return true;
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}
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#endif
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@ -268,8 +268,4 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
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return __pkru_allows_pkey(vma_pkey(vma), write);
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}
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static inline bool arch_pte_access_permitted(pte_t pte, bool write)
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{
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return __pkru_allows_pkey(pte_flags_pkey(pte_flags(pte)), write);
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}
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#endif /* _ASM_X86_MMU_CONTEXT_H */
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@ -32,10 +32,4 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
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/* by default, allow everything */
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return true;
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}
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static inline bool arch_pte_access_permitted(pte_t pte, bool write)
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{
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/* by default, allow everything */
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return true;
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}
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#endif /* _ASM_GENERIC_MM_HOOKS_H */
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3
mm/gup.c
3
mm/gup.c
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@ -1216,9 +1216,6 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
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pte_protnone(pte) || (write && !pte_write(pte)))
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goto pte_unmap;
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if (!arch_pte_access_permitted(pte, write))
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goto pte_unmap;
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VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
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page = pte_page(pte);
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head = compound_head(page);
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