On 05/25/2016 05:45 PM, Tejun Heo wrote:
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 <t...@kernel.org> Reported-and-tested-by: Alexei Starovoitov <alexei.starovoi...@gmail.com> Reported-by: Vlastimil Babka <vba...@suse.cz> Reported-by: Sasha Levin <sasha.le...@oracle.com> Cc: sta...@vger.kernel.org # v3.18+ Fixes: 1a4d76076cda ("percpu: implement asynchronous chunk population")
Didn't spot any problems this time. Thanks
