On 09/01/2020 14:35, Sasha Levin wrote:
On Wed, Jan 08, 2020 at 11:05:40AM +0000, Suzuki K Poulose wrote:
[ Upstream commit 730766bae3280a25d40ea76a53dc6342e84e6513 ]
During a perf session we try to allocate buffers on the "node" associated with the CPU the event is bound to. If it is not bound to a CPU, we use the current CPU node, using smp_processor_id(). However this is unsafe in a pre-emptible context and could generate the splats as below :
BUG: using smp_processor_id() in preemptible [00000000] code: perf/2544
Use NUMA_NO_NODE hint instead of using the current node for events not bound to CPUs.
Fixes: 2997aa4063d97fdb39 ("coresight: etb10: implementing AUX API") Cc: Mathieu Poirier mathieu.poirier@linaro.org Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com Cc: stable stable@vger.kernel.org # v4.9 to v4.19 Signed-off-by: Mathieu Poirier mathieu.poirier@linaro.org Link: https://lore.kernel.org/r/20190620221237.3536-5-mathieu.poirier@linaro.org
I've queued this for 4.9-4.19. There was a simple conflict on 4.9 which also had to be resolved.
Thanks Sasha !
Suzuki