diff options
| author | Tejun Heo <tj@kernel.org> | 2016-05-25 11:48:25 -0400 |
|---|---|---|
| committer | Min Chong <mchong@google.com> | 2016-10-06 21:45:31 -0700 |
| commit | 077d045666866063087a1e71e5e82ede3e139d96 (patch) | |
| tree | 63ad33cac62f771dd2f7eab2d1b443382993d865 /arch/c6x | |
| parent | 78c26bebd182874a7383a5d07446673b61d1ea0e (diff) | |
UPSTREAM: percpu: fix synchronization between chunk->map_extend_work and chunk destruction
(cherry picked from commit 4f996e234dad488e5d9ba0858bc1bae12eff82c3)
Atomic allocations can trigger async map extensions which is serviced
by chunk->map_extend_work. pcpu_balance_work which is responsible for
destroying idle chunks wasn't synchronizing properly against
chunk->map_extend_work and may end up freeing the chunk while the work
item is still in flight.
This patch fixes the bug by rolling async map extension operations
into pcpu_balance_work.
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: 9c824b6a172c ("percpu: make sure chunk->map array has available space")
Change-Id: I8f4aaf7fe0bc0e9f353d41e0a7840c40d6a32117
Bug: 31596597
Diffstat (limited to 'arch/c6x')
0 files changed, 0 insertions, 0 deletions