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authorRik van Riel <riel@redhat.com>2012-10-09 15:31:12 +0200
committerMel Gorman <mgorman@suse.de>2012-12-11 14:28:34 +0000
commit2c3cf556b2f7ab5823195766eddec6f1a43134f5 (patch)
treeed36a604ac7e629e4eb7c36eda1560ba5b19df59 /include/asm-generic/pgtable.h
parentcef23d9db6b76732d9b0933cb162358a6a1f43d7 (diff)
downloadlinux-next-2c3cf556b2f7ab5823195766eddec6f1a43134f5.tar.gz
x86/mm: Introduce pte_accessible()
We need pte_present to return true for _PAGE_PROTNONE pages, to indicate that the pte is associated with a page. However, for TLB flushing purposes, we would like to know whether the pte points to an actually accessible page. This allows us to skip remote TLB flushes for pages that are not actually accessible. Fill in this method for x86 and provide a safe (but slower) method on other architectures. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Fixed-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-66p11te4uj23gevgh4j987ip@git.kernel.org [ Added Linus's review fixes. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/asm-generic/pgtable.h')
-rw-r--r--include/asm-generic/pgtable.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index b36ce40bd1c6..48fc1dc1c74b 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -219,6 +219,10 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
#define move_pte(pte, prot, old_addr, new_addr) (pte)
#endif
+#ifndef pte_accessible
+# define pte_accessible(pte) ((void)(pte),1)
+#endif
+
#ifndef flush_tlb_fix_spurious_fault
#define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address)
#endif