This is a note to let you know that I've just added the patch titled
coresight: etb10: Do not call smp_processor_id from preemptible
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
coresight-etb10-do-not-call-smp_processor_id-from-preemptible.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 730766bae3280a25d40ea76a53dc6342e84e6513 Mon Sep 17 00:00:00 2001
From: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Date: Thu, 20 Jun 2019 16:12:36 -0600
Subject: coresight: etb10: Do not call smp_processor_id from preemptible
From: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
commit 730766bae3280a25d40ea76a53dc6342e84e6513 upstream.
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@xxxxxxxxxx>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx> # 4.6+
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20190620221237.3536-5-mathieu.poirier@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hwtracing/coresight/coresight-etb10.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -275,9 +275,7 @@ static void *etb_alloc_buffer(struct cor
int node;
struct cs_buffers *buf;
- if (cpu == -1)
- cpu = smp_processor_id();
- node = cpu_to_node(cpu);
+ node = (cpu == -1) ? NUMA_NO_NODE : cpu_to_node(cpu);
buf = kzalloc_node(sizeof(struct cs_buffers), GFP_KERNEL, node);
if (!buf)
Patches currently in stable-queue which might be from suzuki.poulose@xxxxxxx are
queue-4.19/coresight-tmc-etf-do-not-call-smp_processor_id-from-preemptible.patch
queue-4.19/coresight-etb10-do-not-call-smp_processor_id-from-preemptible.patch
