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| author | Andi Kleen <ak@muc.de> | 2005-07-27 11:43:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-27 16:25:52 -0700 |
| commit | 90c5029e471636f21221bf66b9a46ada2ab79a22 (patch) | |
| tree | b3a658d77b16fcecdc3c18bfe6eef679e203b757 /mm | |
| parent | c223695634fb360ed65e5a811161853a05e46962 (diff) | |
| download | op-kernel-dev-90c5029e471636f21221bf66b9a46ada2ab79a22.zip op-kernel-dev-90c5029e471636f21221bf66b9a46ada2ab79a22.tar.gz | |
[PATCH] Undo mempolicy shared policy rbtree microoptimization
All mempolicy changes must be inside the spinlock and readding the rb_erase
prevents a crash while doing:
> echo "1" > /tmp/numatest
> numactl --length=0x4000 --shm /tmp/numatest --localalloc
> numactl --length=0x2000 --offset=0 --shm /tmp/numatest --membind=0
> numactl --length=0x2000 --offset=0x2000 --shm /tmp/numatest --membind=1
> ipcs
> ipcrm -M "the_key_value_of_this_shm_area"
Based on a patch by John Blackwood
Cc: <john.blackwood@ccur.com>
Cc: <andrea@suse.de>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mempolicy.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index cb41c31..1694845 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1138,11 +1138,11 @@ void mpol_free_shared_policy(struct shared_policy *p) while (next) { n = rb_entry(next, struct sp_node, nd); next = rb_next(&n->nd); + rb_erase(&n->nd, &p->root); mpol_free(n->policy); kmem_cache_free(sn_cache, n); } spin_unlock(&p->lock); - p->root = RB_ROOT; } /* assumes fs == KERNEL_DS */ |
