linux-kernel - [PATCH 1/2] perf evlist: Fix inverted logic in perf_mmap_

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Message-ID: <1428399071-7141-1-git-send-email-hekuang@huawei.com>
Date:	Tue, 7 Apr 2015 17:31:10 +0800
From:	He Kuang <hekuang@...wei.com>
To:	<acme@...nel.org>, <a.p.zijlstra@...llo.nl>, <mingo@...hat.com>,
	<jolsa@...nel.org>
CC:	<wangnan0@...wei.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] perf evlist: Fix inverted logic in perf_mmap__empty

perf_evlist__mmap_consume() uses perf_mmap__empty() to judge whether
perf_mmap is empty and can be released. But the result is inverted so
fix it.

Signed-off-by: He Kuang <hekuang@...wei.com>
---
 tools/perf/util/evlist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 82bf224..76ef7ee 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -695,7 +695,7 @@ union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 
 static bool perf_mmap__empty(struct perf_mmap *md)
 {
-	return perf_mmap__read_head(md) != md->prev;
+	return perf_mmap__read_head(md) == md->prev;
 }
 
 static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx)
-- 
2.3.3.220.g9ab698f

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