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| author | David Rientjes <rientjes@google.com> | 2012-08-28 19:57:21 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-08-29 11:32:21 -0700 |
| commit | 51cd8e6ff265650e35e46b5bcbe2ee381a7a2877 (patch) | |
| tree | 810b33b488093ecac152252cbe22d4d62c7c9763 | |
| parent | c182ae42cc3611f7b3fa803c0bcab6e5d29bea63 (diff) | |
| download | lwn-51cd8e6ff265650e35e46b5bcbe2ee381a7a2877.tar.gz lwn-51cd8e6ff265650e35e46b5bcbe2ee381a7a2877.zip | |
mm, slab: lock the correct nodelist after reenabling irqs
cache_grow() can reenable irqs so the cpu (and node) can change, so ensure
that we take list_lock on the correct nodelist.
This fixes an issue with commit 072bb0aa5e06 ("mm: sl[au]b: add
knowledge of PFMEMALLOC reserve pages") where list_lock for the wrong
node was taken after growing the cache.
Reported-and-tested-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/slab.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/slab.c b/mm/slab.c index f8b0d539b482..811af03a14ef 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3260,6 +3260,7 @@ force_grow: /* cache_grow can reenable interrupts, then ac could change. */ ac = cpu_cache_get(cachep); + node = numa_mem_id(); /* no objects in sight? abort */ if (!x && (ac->avail == 0 || force_refill)) |