]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commit
hwpoison: fix oops on ksm pages
authorHugh Dickins <hugh.dickins@tiscali.co.uk>
Mon, 26 Oct 2009 23:49:31 +0000 (16:49 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 29 Oct 2009 14:39:24 +0000 (07:39 -0700)
commit92f7ba70eecf4da8264a767b181cc2090f62d4ad
treec8e0fe4239efcf114a01896e3836b30cddf0ba1b
parent2eca40a8ccd4160dbfaa5cbd61038d921d0e5f13
hwpoison: fix oops on ksm pages

Memory failure on a KSM page currently oopses on its NULL anon_vma in
page_lock_anon_vma(): that may not be much worse than the consequence of
ignoring it, but it is better to be consistent with how ZERO_PAGE and
hugetlb pages and other awkward cases are treated.  Just skip it.

We could fix it for 2.6.32 at the KSM end, by putting a dummy anon_vma
pointer in there; but that would get harder next time, when KSM will put a
pointer to something else there (and I'm not currently planning to do any
work to open that up to memory_failure).  So I would prefer this simple
PageKsm test, until the other exceptions are handled.

Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/memory-failure.c