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authorHugh Dickins <hugh.dickins@tiscali.co.uk>2009-06-23 12:36:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-23 12:50:05 -0700
commita5c9b696ec109bb54d547fdb437a7a0c2d514670 (patch)
treec97533e38359a2e731bcc2c65f063a27f4f629e6 /mm/memory.c
parent626f380d0b264a1e40237f5a2a3dffc5d14f256e (diff)
downloadlinux-a5c9b696ec109bb54d547fdb437a7a0c2d514670.tar.bz2
mm: pass mm to grab_swap_token
If a kthread happens to use get_user_pages() on an mm (as KSM does), there's a chance that it will end up trying to read in a swap page, then oops in grab_swap_token() because the kthread has no mm: GUP passes down the right mm, so grab_swap_token() ought to be using it. We have not identified a stronger case than KSM's daemon (not yet in mainline), but the issue must have come up before, since RHEL has included a fix for this for years (though a different fix, they just back out of grab_swap_token if current->mm is unset: which is what we first proposed, but using the right mm here seems more correct). Reported-by: Izik Eidus <ieidus@redhat.com> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 50da9511aa77..f46ac18ba231 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2519,7 +2519,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
delayacct_set_flag(DELAYACCT_PF_SWAPIN);
page = lookup_swap_cache(entry);
if (!page) {
- grab_swap_token(); /* Contend for token _before_ read-in */
+ grab_swap_token(mm); /* Contend for token _before_ read-in */
page = swapin_readahead(entry,
GFP_HIGHUSER_MOVABLE, vma, address);
if (!page) {