linux-kernel - [PATCH] perf test: Test 73 Sig

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Date:   Thu, 16 Dec 2021 16:14:54 +0100
From:   Thomas Richter <tmricht@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, elver@...gle.com
Cc:     svens@...ux.ibm.com, gor@...ux.ibm.com, sumanthk@...ux.ibm.com,
        hca@...ux.ibm.com, Thomas Richter <tmricht@...ux.ibm.com>
Subject: [PATCH] perf test: Test 73 Sig_trap fails on s390

In Linux next kernel
Commit 5504f67944484 ("perf test sigtrap: Add basic stress test for sigtrap handling")
introduced the new test which uses breakpoint events.
These events are not supported on s390 and PowerPC and always fail:

 # perf test -F 73
 73: Sigtrap                                                         : FAILED!
 #

Fix it the same way as in the breakpoint tests in file
tests/bp_account.c where these type of tests are skipped on
s390 and PowerPC platforms.

With this patch skip this test on both platforms.

Output after:
 # ./perf test -F 73
 73: Sigtrap

Fixes: 5504f67944484 ("perf test sigtrap: Add basic stress test for sigtrap handling")

Cc: Marco Elver <elver@...gle.com>
Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
---
 tools/perf/tests/sigtrap.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tools/perf/tests/sigtrap.c b/tools/perf/tests/sigtrap.c
index 1004bf0e7cc9..1f147fe6595f 100644
--- a/tools/perf/tests/sigtrap.c
+++ b/tools/perf/tests/sigtrap.c
@@ -22,6 +22,19 @@
 #include "tests.h"
 #include "../perf-sys.h"
 
+/*
+ * PowerPC and S390 do not support creation of instruction breakpoints using the
+ * perf_event interface.
+ *
+ * Just disable the test for these architectures until these issues are
+ * resolved.
+ */
+#if defined(__powerpc__) || defined(__s390x__)
+#define BP_ACCOUNT_IS_SUPPORTED 0
+#else
+#define BP_ACCOUNT_IS_SUPPORTED 1
+#endif
+
 #define NUM_THREADS 5
 
 static struct {
@@ -122,6 +135,11 @@ static int test__sigtrap(struct test_suite *test __maybe_unused, int subtest __m
 	char sbuf[STRERR_BUFSIZE];
 	int i, fd, ret = TEST_FAIL;
 
+	if (!BP_ACCOUNT_IS_SUPPORTED) {
+		pr_debug("Test not supported on this architecture");
+		return TEST_SKIP;
+	}
+
 	pthread_barrier_init(&barrier, NULL, NUM_THREADS + 1);
 
 	action.sa_flags = SA_SIGINFO | SA_NODEFER;
-- 
2.33.1