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| author | Tejun Heo <tj@kernel.org> | 2016-05-25 17:48:25 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2016-05-25 17:48:25 +0200 |
| commit | 6710e594f71ccaad8101bc64321152af7cd9ea28 (patch) | |
| tree | 526322970c44a03be3b46d27e45644fa188886fb /init | |
| parent | percpu: fix synchronization between chunk->map_extend_work and chunk destruction (diff) | |
| download | linux-6710e594f71ccaad8101bc64321152af7cd9ea28.tar.xz linux-6710e594f71ccaad8101bc64321152af7cd9ea28.zip | |
percpu: fix synchronization between synchronous map extension and chunk destruction
For non-atomic allocations, pcpu_alloc() can try to extend the area
map synchronously after dropping pcpu_lock; however, the extension
wasn't synchronized against chunk destruction and the chunk might get
freed while extension is in progress.
This patch fixes the bug by putting most of non-atomic allocations
under pcpu_alloc_mutex to synchronize against pcpu_balance_work which
is responsible for async chunk management including destruction.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Reported-by: Vlastimil Babka <vbabka@suse.cz>
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Cc: stable@vger.kernel.org # v3.18+
Fixes: 1a4d76076cda ("percpu: implement asynchronous chunk population")
Diffstat (limited to 'init')
0 files changed, 0 insertions, 0 deletions