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

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Date:	Tue, 7 Apr 2015 08:59:15 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	He Kuang <hekuang@...wei.com>
Cc:	a.p.zijlstra@...llo.nl, mingo@...hat.com, jolsa@...nel.org,
	wangnan0@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf evlist: Fix inverted logic in perf_mmap__empty

Em Tue, Apr 07, 2015 at 05:31:10PM +0800, He Kuang escreveu:
> 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.

> diff --git 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)

Argh, thanks, good spotting, applying...

- Arnaldo
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