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authorRobin Holt <holt@sgi.com>2010-03-23 21:35:26 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-25 00:31:20 +0100
commitcb53237513bd1e090cce120efe12ede72c932b5f (patch)
tree43d0665b57b654cf10ea12233e8234367e1634e0 /drivers/misc/c2port
parentscripts/kernel-doc: fix fatal error on function prototype (diff)
downloadlinux-cb53237513bd1e090cce120efe12ede72c932b5f.tar.xz
linux-cb53237513bd1e090cce120efe12ede72c932b5f.zip
mm/ksm.c is doing an unneeded _notify in write_protect_page.
ksm.c's write_protect_page implements a lockless means of verifying a page does not have any users of the page which are not accounted for via other kernel tracking means. It does this by removing the writable pte with TLB flushes, checking the page_count against the total known users, and then using set_pte_at_notify to make it a read-only entry. An unneeded mmu_notifier callout is made in the case where the known users does not match the page_count. In that event, we are inserting the identical pte and there is no need for the set_pte_at_notify, but rather the simpler set_pte_at suffices. Signed-off-by: Robin Holt <holt@sgi.com> Acked-by: Izik Eidus <ieidus@redhat.com> Acked-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Chris Wright <chrisw@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/misc/c2port')
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