On Wed, Jan 08, 2020 at 11:01:41AM +0000, Suzuki Kuruppassery Poulose wrote:
Greg,
On 07/01/2020 20:55, Greg Kroah-Hartman wrote:
From: Suzuki K Poulose suzuki.poulose@arm.com
[ 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 # 4.6+ Signed-off-by: Mathieu Poirier mathieu.poirier@linaro.org Link: https://lore.kernel.org/r/20190620221237.3536-5-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org
drivers/hwtracing/coresight/coresight-etb10.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c index 0dad8626bcfb..0a59bf3af40b 100644 --- a/drivers/hwtracing/coresight/coresight-etb10.c +++ b/drivers/hwtracing/coresight/coresight-etb10.c @@ -275,9 +275,7 @@ static void *etb_alloc_buffer(struct coresight_device *csdev, int cpu, int node; struct cs_buffers *buf;
- if (cpu == -1)
cpu = smp_processor_id();- node = cpu_to_node(cpu);
- node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu);
Please drop this patch too, from the list as it will break the build with undefined "event" variable. I will post a backport soon.
Also now dropped, thanks.
greg k-h