linux-kernel - Re: arm/arm64 perf build issue with mainline

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Message-ID: <20150424161058.GA19673@redhat.com>
Date:	Fri, 24 Apr 2015 13:10:58 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	David Ahern <david.ahern@...cle.com>
Cc:	Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org,
	Mark Rutland <Mark.Rutland@....com>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: arm/arm64 perf build issue with mainline

Em Thu, Apr 23, 2015 at 08:16:15AM -0600, David Ahern escreveu:
> On 4/23/15 8:04 AM, Will Deacon wrote:
> >+++ b/tools/perf/Makefile
> >@@ -24,7 +24,7 @@ unexport MAKEFLAGS
> >  # (To override it, run 'make JOBS=1' and similar.)
> >  #
> >  ifeq ($(JOBS),)
> >-  JOBS := $(shell egrep -c '^processor|^CPU' /proc/cpuinfo 2>/dev/null)
> >+  JOBS := $(shell getconf _NPROCESSORS_ONLN 2>/dev/null)
> >    ifeq ($(JOBS),0)
> >      JOBS := 1
> >    endif
 
> Certainly a more robust way of doing it but I am concerned this
> might end up breaking others. For Fedora at least getconf is in the
> glibc-common package and there are users that do not build with
> glibc. It is not clear if the build system for those environments
> will have getconf.

Hum, perhaps check if getconf is present, if not fallback to the egrep
-c? I'll try.

- Arnaldo
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