linux-kernel - perf version not set when building out of tree

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Date:	Thu, 31 Oct 2013 17:31:55 -0600
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>
Subject: perf version not set when building out of tree

When building out of tree:

make perf-tar-src-pkg
tar -xf perf-<ver>.tar -C /tmp
cd /tmp/perf<ver>
make -C tools/perf

you get the warning message:
make[1]: *** No rule to make target `kernelversion'.  Stop.

which comes from tools/perf/util/PERF-VERSION-GEN,

if test -z "$TAG"
then
     TAG=$(MAKEFLAGS= make -sC ../.. kernelversion)
fi

There is no top level Makefile. perf is actually built, but has no 
version info:

$ tools/perf/perf --version
perf version

I thought someone had proposed a way to fix that.

David
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