linux-kernel - [PATCH] tracing: Use cpumask_available() to check if cpumask variable may be used

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Message-Id: <20170421234110.117075-1-mka@chromium.org>
Date:   Fri, 21 Apr 2017 16:41:10 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Grant Grundler <grundler@...omium.org>,
        Greg Hackmann <ghackmann@...gle.com>,
        Michael Davidson <md@...gle.com>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH] tracing: Use cpumask_available() to check if cpumask variable may be used

This fixes the following clang warning:

kernel/trace/trace.c:3231:12: warning: address of array 'iter->started'
  will always evaluate to 'true' [-Wpointer-bool-conversion]
        if (iter->started)

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
Dependencies:
- "cpumask: Add helper cpumask_available()"
  - git.kernel.org tip master f7e30f01a9e2
  - https://patchwork.kernel.org/patch/9678159/

 kernel/trace/trace.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d484452ae648..95eeefc08605 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3222,13 +3222,14 @@ 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 */
-- 
2.12.2.816.g2cccc81164-goog