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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 /arch/x86
parentcef23d9db6b76732d9b0933cb162358a6a1f43d7 (diff)
downloadop-kernel-dev-2c3cf556b2f7ab5823195766eddec6f1a43134f5.zip
op-kernel-dev-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 'arch/x86')
-rw-r--r--arch/x86/include/asm/pgtable.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index a1f780d..5fe03aa 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -407,6 +407,12 @@ static inline int pte_present(pte_t a)
return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
}
+#define pte_accessible pte_accessible
+static inline int pte_accessible(pte_t a)
+{
+ return pte_flags(a) & _PAGE_PRESENT;
+}
+
static inline int pte_hidden(pte_t pte)
{
return pte_flags(pte) & _PAGE_HIDDEN;
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