[PATCH] tools/perf: fix silent build with 'make -s'

[Konstantin Khlebnikov]

tools/perf/Makefile conflicts with option '-j'.
The rest options must be passed as is.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
---
 tools/perf/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 7902a5681fc8..989c3d2f847b 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -16,7 +16,7 @@
 #
 # We don't want to pass along options like -j:
 #
-unexport MAKEFLAGS
+MAKEFLAGS := $(filter --j% -j,$(MAKEFLAGS))
 
 #
 # Do a parallel build with multiple jobs, based on the number of CPUs online