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Subject[PATCH] perf test: Skip wp modify test on old kernels
Date
It uses PERF_EVENT_IOC_MODIFY_ATTRIBUTES ioctl.	 The kernel would return
ENOTTY if it's not supported. Update the skip reason in that case.

Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
I'd like to add Fixes: 2e85d5979e8d tag here but it'd conlict with the
later change in e47c6ecaae1d.

tools/perf/tests/wp.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/perf/tests/wp.c b/tools/perf/tests/wp.c
index 9d4c45184e71..99f048cd6faa 100644
--- a/tools/perf/tests/wp.c
+++ b/tools/perf/tests/wp.c
@@ -2,6 +2,7 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include <errno.h>
#include <sys/ioctl.h>
#include <linux/hw_breakpoint.h>
#include <linux/kernel.h>
@@ -137,8 +138,7 @@ static int test__wp_rw(struct test_suite *test __maybe_unused,
#endif
}

-static int test__wp_modify(struct test_suite *test __maybe_unused,
- int subtest __maybe_unused)
+static int test__wp_modify(struct test_suite *test, int subtest)
{
#if defined(__s390x__)
return TEST_SKIP;
@@ -160,6 +160,11 @@ static int test__wp_modify(struct test_suite *test __maybe_unused,
new_attr.disabled = 1;
ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr);
if (ret < 0) {
+ if (errno == ENOTTY) {
+ test->test_cases[subtest].skip_reason = "missing kernel support";
+ ret = TEST_SKIP;
+ }
+
pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n");
close(fd);
return ret;
--
2.37.2.789.g6183377224-goog
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