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authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-31 16:32:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-31 16:32:40 -0800
commita2ca3d617944417e9dd5f09fc8a4549cda115f4f (patch)
treeb8a247cd32979a94d424439525f121919c3a3739
parent283725af0bd2a4a8600bbe5edeb9d7c72780d3a2 (diff)
parent79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (diff)
downloadlinux-a2ca3d617944417e9dd5f09fc8a4549cda115f4f.tar.bz2
Merge tag 'trace-4.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fix from Steven Rostedt: "It was reported to me that the thread created by the hwlat tracer does not migrate after the first instance. I found that there was as small bug in the logic, and fixed it. It's minor, but should be fixed regardless. There's not much impact outside the hwlat tracer" * tag 'trace-4.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Fix hwlat kthread migration
-rw-r--r--kernel/trace/trace_hwlat.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index 775569ec50d0..af344a1bf0d0 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -266,7 +266,7 @@ out:
static struct cpumask save_cpumask;
static bool disable_migrate;
-static void move_to_next_cpu(void)
+static void move_to_next_cpu(bool initmask)
{
static struct cpumask *current_mask;
int next_cpu;
@@ -275,7 +275,7 @@ static void move_to_next_cpu(void)
return;
/* Just pick the first CPU on first iteration */
- if (!current_mask) {
+ if (initmask) {
current_mask = &save_cpumask;
get_online_cpus();
cpumask_and(current_mask, cpu_online_mask, tracing_buffer_mask);
@@ -330,10 +330,12 @@ static void move_to_next_cpu(void)
static int kthread_fn(void *data)
{
u64 interval;
+ bool initmask = true;
while (!kthread_should_stop()) {
- move_to_next_cpu();
+ move_to_next_cpu(initmask);
+ initmask = false;
local_irq_disable();
get_sample();