diff options
| author | Tejun Heo <tj@kernel.org> | 2016-05-25 11:48:25 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-07-27 09:47:33 -0700 |
| commit | c26ae537f16f653c2541df9e338013653fc3fcc7 (patch) | |
| tree | fdcffaa70b532e9c64f32299d5627f277dc2254c /tools/perf/scripts/python | |
| parent | 0da3127a76c2cf7ad2c56e88841fa83613a67a77 (diff) | |
percpu: fix synchronization between chunk->map_extend_work and chunk destruction
commit 4f996e234dad488e5d9ba0858bc1bae12eff82c3 upstream.
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>
Fixes: 9c824b6a172c ("percpu: make sure chunk->map array has available space")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions