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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2012-12-12 22:51:14 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-13 02:38:32 +0100
commit3ea41e6210fea3b234b6cb3e9443e75975850bbf (patch)
tree1c8490271a6cffa9b43858e0f29d6ddab0122fac /scripts/decodecode
parentthp: introduce sysfs knob to disable huge zero page (diff)
downloadlinux-3ea41e6210fea3b234b6cb3e9443e75975850bbf.tar.xz
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thp: avoid race on multiple parallel page faults to the same page
pmd value is stable only with mm->page_table_lock taken. After taking the lock we need to check that nobody modified the pmd before changing it. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Jiri Slaby <jslaby@suse.cz> Cc: David Rientjes <rientjes@google.com> Reviewed-by: Bob Liu <lliubbo@gmail.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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