| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 097/143] perf tests evsel-tp-sched: Fix bitwise operator | Date | Mon, 18 Feb 2019 14:43:45 +0100 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Gustavo A. R. Silva <gustavo@embeddedor.com>
commit 489338a717a0dfbbd5a3fabccf172b78f0ac9015 upstream.
Notice that the use of the bitwise OR operator '|' always leads to true in this particular case, which seems a bit suspicious due to the context in which this expression is being used.
Fix this by using bitwise AND operator '&' instead.
This bug was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: stable@vger.kernel.org Fixes: 6a6cd11d4e57 ("perf test: Add test for the sched tracepoint format fields") Link: http://lkml.kernel.org/r/20190122233439.GA5868@embeddedor Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- tools/perf/tests/evsel-tp-sched.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/perf/tests/evsel-tp-sched.c +++ b/tools/perf/tests/evsel-tp-sched.c @@ -16,7 +16,7 @@ static int perf_evsel__test_field(struct return -1; } - is_signed = !!(field->flags | FIELD_IS_SIGNED); + is_signed = !!(field->flags & FIELD_IS_SIGNED); if (should_be_signed && !is_signed) { pr_debug("%s: \"%s\" signedness(%d) is wrong, should be %d\n", evsel->name, name, is_signed, should_be_signed);
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