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From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>
Cc: linux-kernel@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH] perf tests: evsel-tp-sched: Fix bitwise operator
Date: Tue, 22 Jan 2019 17:34:39 -0600
Message-ID: <20190122233439.GA5868@embeddedor> (raw)

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.

Fixes: 6a6cd11d4e57 ("perf test: Add test for the sched tracepoint format fields")
Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---

NOTE: Notice that this code has been there since 2012. So, it would
      be helpful if someone can double-check this. Thanks.

 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);
-- 
2.20.1


             reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-22 23:34 Gustavo A. R. Silva [this message]
2019-01-23  8:33 ` Jiri Olsa
2019-01-23  8:40   ` Gustavo A. R. Silva
2019-01-28 19:29     ` Gustavo A. R. Silva
2019-01-29  9:01   ` Arnaldo Carvalho de Melo
2019-02-09 12:19 ` [tip:perf/urgent] perf tests " tip-bot for Gustavo A. R. Silva

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