linux-kernel - [tip:perf/urgent] perf tests evsel-tp-sched: Fix bitwise operator

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Message-ID: <tip-489338a717a0dfbbd5a3fabccf172b78f0ac9015@git.kernel.org>
Date:   Sat, 9 Feb 2019 04:19:23 -0800
From:   "tip-bot for Gustavo A. R. Silva" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, gustavo@...eddedor.com,
        hpa@...or.com, alexander.shishkin@...ux.intel.com,
        tglx@...utronix.de, peterz@...radead.org, mingo@...nel.org,
        namhyung@...nel.org, acme@...hat.com, jolsa@...nel.org
Subject: [tip:perf/urgent] perf tests evsel-tp-sched: Fix bitwise operator

Commit-ID:  489338a717a0dfbbd5a3fabccf172b78f0ac9015
Gitweb:     https://git.kernel.org/tip/489338a717a0dfbbd5a3fabccf172b78f0ac9015
Author:     Gustavo A. R. Silva <gustavo@...eddedor.com>
AuthorDate: Tue, 22 Jan 2019 17:34:39 -0600
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 4 Feb 2019 11:32:14 -0300

perf tests evsel-tp-sched: Fix bitwise operator

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@...eddedor.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: stable@...r.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@...hat.com>
---
 tools/perf/tests/evsel-tp-sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/evsel-tp-sched.c b/tools/perf/tests/evsel-tp-sched.c
index 5f8501c68da4..5cbba70bcdd0 100644
--- a/tools/perf/tests/evsel-tp-sched.c
+++ b/tools/perf/tests/evsel-tp-sched.c
@@ -17,7 +17,7 @@ static int perf_evsel__test_field(struct perf_evsel *evsel, const char *name,
 		return -1;
 	}
 
-	is_signed = !!(field->flags | TEP_FIELD_IS_SIGNED);
+	is_signed = !!(field->flags & TEP_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);