linux-kernel - Re: [PATCH v2] perf tools: Work around lack of sched

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Date:	Thu, 19 Mar 2015 10:14:55 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Vinson Lee <vlee@...pensource.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Yann Droneaud <ydroneaud@...eya.com>,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	Vinson Lee <vlee@...tter.com>
Subject: Re: [PATCH v2] perf tools: Work around lack of sched_getcpu in glibc
 < 2.6.

Em Thu, Mar 19, 2015 at 11:13:04AM +0100, Jiri Olsa escreveu:
> On Wed, Mar 18, 2015 at 04:11:52PM -0700, Vinson Lee wrote:
> > This patch fixes this build error with glibc < 2.6.

> > +#ifdef __GLIBC_PREREQ
> > +#if !__GLIBC_PREREQ(2, 6)
> > +static int sched_getcpu(void)
> > +{
> > +	errno = ENOSYS;
> > +	return -1;
> > +}
> > +#endif
> > +#endif
 
> you could mark it as __weak and get rid of those ifdef's
> like we do for strlcpy in utilpath.c

Agreed.

- Arnaldo
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