]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
mm, oom: fix missing tlb_finish_mmu() in __oom_reap_task_mm().
authorTetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Tue, 4 Sep 2018 22:45:37 +0000 (15:45 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 4 Sep 2018 23:45:02 +0000 (16:45 -0700)
commit79cc81057eef7ad846588976296ab0f266c1a7a5
treee9dd2511a9cc450959e726624980360347c318c3
parent3100dab2aa09dc6e082956e306fc9f81b3cc0f7a
mm, oom: fix missing tlb_finish_mmu() in __oom_reap_task_mm().

Commit 93065ac753e4 ("mm, oom: distinguish blockable mode for mmu
notifiers") has added an ability to skip over vmas with blockable mmu
notifiers. This however didn't call tlb_finish_mmu as it should.

As a result inc_tlb_flush_pending has been called without its pairing
dec_tlb_flush_pending and all callers mm_tlb_flush_pending would flush
even though this is not really needed.  This alone is not harmful and it
seems there shouldn't be any such callers for oom victims at all but
there is no real reason to skip tlb_finish_mmu on early skip either so
call it.

[mhocko@suse.com: new changelog]
Link: http://lkml.kernel.org/r/b752d1d5-81ad-7a35-2394-7870641be51c@i-love.sakura.ne.jp
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/oom_kill.c