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This is a trivial patch that changes a check for a cpumask from a NULL

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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.
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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
This commit is contained in:
Linus Torvalds 2017-05-10 11:26:25 -07:00
commit 29250d301b
1 changed files with 3 additions and 2 deletions
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5
kernel/trace/trace.c
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@ -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 */