linux-kernel - Re: [PATCH 03/44] perf tools: Add user events for AUX area tracing

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Date:	Mon, 20 Apr 2015 20:10:31 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 03/44] perf tools: Add user events for AUX area tracing

Em Mon, Apr 20, 2015 at 08:06:45PM -0300, Arnaldo Carvalho de Melo escreveu:
> I noticed it tho because of this:
> 
> util/session.c: In function ‘skipn’:
> util/session.c:279:28: error: comparison between signed and unsigned
> integer expressions [-Werror=sign-compare]
>    ret = read(fd, buf, MIN(n, sizeof(buf)));
>                             ^
> util/session.c:279:47: error: signed and unsigned type in conditional
> expression [-Werror=sign-compare]
>    ret = read(fd, buf, MIN(n, sizeof(buf)));
>                                                ^
> cc1: all warnings being treated as errors
> make[3]: *** [/tmp/build/perf/util/session.o] Error 1
> make[3]: *** Waiting for unfinished jobs....
> 
> Fixing it to be:
> 
>     ret = read(fd, buf, min(n, (off_t)sizeof(buf)));
> 
> Ok?

I think the right thing would be for us to adopt min_t() and friends, as
defined in include/linux/kernel.h, but will leave this for later...

- Arnaldo

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