Commit 01ea3894 authored Jan 20, 2026 by Arnaldo Carvalho de Melo

perf tests sw-clock: Mark the volatile tmp variable as __maybe_unused



As it is just used to waste some cycles, not being used as all, to
silence some compilers.

Noticed with gcc version 16.0.1 20260115 on fedora 44:

    tests/sw-clock.c: In function '__test__sw_clock_freq':
    tests/sw-clock.c:31:22: error: variable 'tmp' set but not used [-Werror=unused-but-set-variable=]
       31 |         volatile int tmp = 0;
          |                      ^~~

Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 3d020f2e

tools/perf/tests/sw-clock.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -5,6 +5,7 @@
		#include <stdlib.h>
		#include <signal.h>
		#include <sys/mman.h>
		#include <linux/compiler.h>
		#include <linux/string.h>

		#include "tests.h"
		@@ -28,7 +29,7 @@
		static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
		{
		int i, err = -1;
		volatile int tmp = 0;
		volatile int tmp __maybe_unused = 0;
		u64 total_periods = 0;
		int nr_samples = 0;
		char sbuf[STRERR_BUFSIZE];