[PATCH] perf test: Skip syscall enum test if no landlock syscall

[Namhyung Kim <namhyung@kernel.org>]

The perf trace enum augmentation test specifically targets landlock_
add_rule syscall but IIUC it's an optional and can be opt-out by a
kernel config.

Currently trace_landlock() runs `perf test -w landlock` before the
actual testing to check the availability but it's not enough since the
workload always returns 0.  Instead it could check if perf trace output
has 'landlock' string.

Fixes: d66763fed30f0bd8c ("perf test trace_btf_enum: Add regression test for the BTF augmentation of enums in 'perf trace'")
Cc: Howard Chu <howardchu95@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/tests/shell/trace_btf_enum.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/trace_btf_enum.sh b/tools/perf/tests/shell/trace_btf_enum.sh
index 5a3b8a5a9b5cf296..e57ad6913f3e9316 100755
--- a/tools/perf/tests/shell/trace_btf_enum.sh
+++ b/tools/perf/tests/shell/trace_btf_enum.sh
@@ -27,7 +27,11 @@ trace_landlock() {
   echo "Tracing syscall ${syscall}"
 
   # test flight just to see if landlock_add_rule and libbpf are available
-  $TESTPROG
+  if ! perf trace $TESTPROG 2>&1 | grep -q landlock
+  then
+    echo "No landlock system call found. Fallback to non-syscall tracing."
+    return
+  fi
 
   if perf trace -e $syscall $TESTPROG 2>&1 | \
      grep -q -E ".*landlock_add_rule\(ruleset_fd: 11, rule_type: (LANDLOCK_RULE_PATH_BENEATH|LANDLOCK_RULE_NET_PORT), rule_attr: 0x[a-f0-9]+, flags: 45\) = -1.*"
-- 
2.48.0.rc2.279.g1de40edade-goog