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authorAndrea Arcangeli <aarcange@redhat.com>2010-08-09 17:19:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 20:44:58 -0700
commit288468c334e98aacbb7e2fb8bde6bc1adcd55e05 (patch)
treef64cfebd7fedfd4e53fd5d4474048d5475a339b9 /sound/i2c
parentba6f0ff3981e6263ab81ac512f04cca55b85ec81 (diff)
downloadlinux-288468c334e98aacbb7e2fb8bde6bc1adcd55e05.tar.bz2
rmap: always use anon_vma root pointer
Always use anon_vma->root pointer instead of anon_vma_chain.prev. Also optimize the map-paths, if a mapping is already established no need to overwrite it with root anon-vma list, we can keep the more finegrined anon-vma and skip the overwrite: see the PageAnon check in !exclusive case. This is also the optimization that hidden the ksm bug as this tends to make ksm_might_need_to_copy skip the copy, but only the proper fix to ksm_might_need_to_copy guarantees not triggering the ksm bug unless ksm is in use. this is an optimization only... [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Rik van Riel <riel@redhat.com> [kamezawa.hiroyu@jp.fujitsu.com: fix false positive BUG_ON in __page_set_anon_rmap] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'sound/i2c')
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