Searched hist:"6710 e594f71ccaad8101bc64321152af7cd9ea28" (Results 1 – 1 of 1) sorted by relevance
| /linux/mm/ |
| H A D | percpu.c | diff 6710e594f71ccaad8101bc64321152af7cd9ea28 Wed May 25 17:48:25 CEST 2016 Tejun Heo <tj@kernel.org> 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")
|