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| author |   Hugh Dickins <hughd@google.com> | 2012-04-18 23:34:46 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-18 23:40:57 -0700 |
| commit | 9b7f43afd417a6feb80841d30ced4051c362eb5d (patch) | |
| tree | 695f97a4d028a3463c8e7edaa4c6d410a941d0bb /arch | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security (diff) | |
| download | linux-dev-9b7f43afd417a6feb80841d30ced4051c362eb5d.tar.xz linux-dev-9b7f43afd417a6feb80841d30ced4051c362eb5d.zip | |
memcg: fix Bad page state after replace_page_cache
My 9ce70c0240d0 "memcg: fix deadlock by inverting lrucare nesting" put a
nasty little bug into v3.3's version of mem_cgroup_replace_page_cache(),
sometimes used for FUSE. Replacing __mem_cgroup_commit_charge_lrucare()
by __mem_cgroup_commit_charge(), I used the "pc" pointer set up earlier:
but it's for oldpage, and needs now to be for newpage. Once oldpage was
freed, its PageCgroupUsed bit (cleared above but set again here) caused
"Bad page state" messages - and perhaps worse, being missed from newpage.
(I didn't find this by using FUSE, but in reusing the function for tmpfs.)
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: stable@vger.kernel.org [v3.3 only]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions