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>

diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index b9e3f0a..ecf9885 100644 (file)
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -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 */

diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 6e31d87..fa2bf69 100644 (file)
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -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 */

diff --git a/arch/um/include/asm/mmu_context.h b/arch/um/include/asm/mmu_context.h
index 94ac273..b668e35 100644 (file)
--- a/arch/um/include/asm/mmu_context.h
+++ b/arch/um/include/asm/mmu_context.h
@@ -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
  */

diff --git a/arch/unicore32/include/asm/mmu_context.h b/arch/unicore32/include/asm/mmu_context.h
index 62dfc64..59b06b4 100644 (file)
--- a/arch/unicore32/include/asm/mmu_context.h
+++ b/arch/unicore32/include/asm/mmu_context.h
@@ -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

diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index 306c7e1..68b329d 100644 (file)
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -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 */

diff --git a/include/asm-generic/mm_hooks.h b/include/asm-generic/mm_hooks.h
index cc5d9a1..41e5b67 100644 (file)
--- a/include/asm-generic/mm_hooks.h
+++ b/include/asm-generic/mm_hooks.h
@@ -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 */

diff --git a/mm/gup.c b/mm/gup.c
index 04aa405..3f2338b 100644 (file)
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -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);