Merge branch 'tip/perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/urgent

Pull ftrace ring-buffer resizing fix from Steve Rostedt.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index b32ed0e385a5..b979426d16c6 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1567,6 +1567,10 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size,
 
                 put_online_cpus();
         } else {
+                /* Make sure this CPU has been intitialized */
+                if (!cpumask_test_cpu(cpu_id, buffer->cpumask))
+                        goto out;
+
                 cpu_buffer = buffer->buffers[cpu_id];
 
                 if (nr_pages == cpu_buffer->nr_pages)