[PATCH V2 2/3] tools/perf/tests: Fix branch stack sampling test to include sanity check for branch filter

[Athira Rajeev]

commit b55878c90ab9 ("perf test: Add test for branch stack sampling")
added test for branch stack sampling. There is a sanity check in the
beginning to skip the test if the hardware doesn't support branch stack
sampling.

Snippet
<<>>
skip the test if the hardware doesn't support branch stack sampling
perf record -b -o- -B true > /dev/null 2>&1 || exit 2
<<>>

But the testcase also uses branch sample types: save_type, any. if any
platform doesn't support the branch filters used in the test, the testcase
will fail. In powerpc, currently mutliple branch filters are not supported
and hence this test fails in powerpc. Fix the sanity check to look at
the support for branch filters used in this test before proceeding with
the test.

Fixes: b55878c90ab9 ("perf test: Add test for branch stack sampling")
Reported-by: Disha Goel <disgoel at linux.vnet.ibm.com>
Signed-off-by: Athira Rajeev <atrajeev at linux.vnet.ibm.com>
Reviewed-by: Kajol Jain <kjain at linux.ibm.com>
---
 tools/perf/tests/shell/test_brstack.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/test_brstack.sh b/tools/perf/tests/shell/test_brstack.sh
index c644f94a6500..ec801cffae6b 100755
--- a/tools/perf/tests/shell/test_brstack.sh
+++ b/tools/perf/tests/shell/test_brstack.sh
@@ -12,7 +12,8 @@ if ! [ -x "$(command -v cc)" ]; then
 fi
 
 # skip the test if the hardware doesn't support branch stack sampling
-perf record -b -o- -B true > /dev/null 2>&1 || exit 2
+# and if the architecture doesn't support filter types: any,save_type,u
+perf record -b -o- -B --branch-filter any,save_type,u true > /dev/null 2>&1 || exit 2
 
 TMPDIR=$(mktemp -d /tmp/__perf_test.program.XXXXX)
 
-- 
2.31.1