Merge tag 'trace-v4.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fix from Steven Rostedt:
 "This is a trivial patch that changes a check for a cpumask from a NULL
  pointer to using cpumask_available(), which will do the check. This is
  because cpumasks when not allocated are always set, and clang
  complains about it"

* tag 'trace-v4.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Use cpumask_available() to check if cpumask variable may be used

1 files changed, 3 insertions, 2 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 4ad4420b33d6..c4536c449021 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3311,13 +3311,14 @@ static void test_cpu_buff_start(struct trace_iterator *iter)
         if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
                 return;
 
-        if (iter->started && cpumask_test_cpu(iter->cpu, iter->started))
+        if (cpumask_available(iter->started) &&
+            cpumask_test_cpu(iter->cpu, iter->started))
                 return;
 
         if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries)
                 return;
 
-        if (iter->started)
+        if (cpumask_available(iter->started))
                 cpumask_set_cpu(iter->cpu, iter->started);
 
         /* Don't print started cpu buffer for the first entry of the trace */