perf tests: Fix tarpkg build test error output redirection

Commit-ID:  cde88355f2cd7082f5a208901f99b80f4823872c
Gitweb:     http://git.kernel.org/tip/cde88355f2cd7082f5a208901f99b80f4823872c
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Thu, 24 Mar 2016 11:22:43 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Thu, 24 Mar 2016 12:26:41 -0300

perf tests: Fix tarpkg build test error output redirection

So we need to trow away just stdout, leaving stderr to be caught by the build tests infrastructure, so that we can see what went wrong when the tarpkg build test fails:

  $ make -C tools/perf build-test
  make: Entering directory '/home/acme/git/linux/tools/perf'
  - tarpkg: ./tests/perf-targz-src-pkg .
  tests/make:302: recipe for target 'tarpkg' failed
  make[1]: *** [tarpkg] Error 2
  Makefile:102: recipe for target 'build-test' failed
  make: *** [build-test] Error 2
  make: Leaving directory '/home/acme/git/linux/tools/perf'
  $ cat tools/perf/tarpkg
  ./tests/perf-targz-src-pkg .
    PERF_VERSION = 4.5.g05f5ec
    PERF_VERSION = 4.5.g05f5ec
  In file included from bench/mem-memcpy-x86-64-asm.S:9:0:
  bench/../../../arch/x86/lib/memcpy_64.S:5:29: fatal error: asm/cpufeatures.h: No such file or directory
  compilation terminated.
  mv: cannot stat ‘bench/.mem-memcpy-x86-64-asm.o.tmp’: No such file or directory
  make[5]: *** [bench/mem-memcpy-x86-64-asm.o] Error 1
  make[5]: *** Waiting for unfinished jobs....
  make[4]: *** [bench] Error 2
  make[4]: *** Waiting for unfinished jobs....
  make[3]: *** [perf-in.o] Error 2
  make[3]: *** Waiting for unfinished jobs....
  make[2]: *** [all] Error 2
  $

So the test flow is:

1. Run: 'make -C tools/perf build-test'

2. One of its tests failed, in this case, the 'tarpkg' one

3. Look at what went wrong, by looking at the output of that test, in tools/perf/tarpkg

Admittedly, this should be shortcircuited to showing what went wrong directly from the 'make build-test' step, but lets first fix this tarpkg one and the problem it spotted, which should be fixed by adding some extra file to the tools/perf/MANIFEST so that detached tarballs continue being self contained and build successfully.

---
 tools/perf/tests/perf-targz-src-pkg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 238aa39..f2d9c5f 100755
@@ -15,7 +15,7 @@ TMP_DEST=$(mktemp -d)
 tar xf ${TARBALL} -C $TMP_DEST
 rm -f ${TARBALL}
 cd - > /dev/null
-make -C $TMP_DEST/perf*/tools/perf > /dev/null 2>&1
+make -C $TMP_DEST/perf*/tools/perf > /dev/null
 RC=$?
 rm -rf ${TMP_DEST}
 exit $RC