[tip: sched/urgent] selftests/rseq: Skip tests if time slice extensions are not available

[tip-bot2 for Thomas Gleixner]

The following commit has been merged into the sched/urgent branch of tip:

Commit-ID:     02b44d943b3adddc3a15c1da97045e205b7d14c1
Gitweb:        https://git.kernel.org/tip/02b44d943b3adddc3a15c1da97045e205b7d14c1
Author:        Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate:    Sat, 25 Apr 2026 15:46:06 +02:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Tue, 05 May 2026 16:03:11 +02:00

selftests/rseq: Skip tests if time slice extensions are not available

Don't fail, skip the test if the extensions are not enabled at compile or
runtime.

Fixes: 830969e7821a ("selftests/rseq: Implement time slice extension test")
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Tested-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Link: https://patch.msgid.link/20260428224427.597838491%40kernel.org
Cc: stable@xxxxxxxxxxxxxxx
---
 tools/testing/selftests/rseq/slice_test.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/rseq/slice_test.c b/tools/testing/selftests/rseq/slice_test.c
index 357122d..77e668f 100644
--- a/tools/testing/selftests/rseq/slice_test.c
+++ b/tools/testing/selftests/rseq/slice_test.c
@@ -124,6 +124,13 @@ FIXTURE_SETUP(slice_ext)
 {
 	cpu_set_t affinity;
 
+	if (rseq_register_current_thread())
+		SKIP(return, "RSEQ not supported\n");
+
+	if (prctl(PR_RSEQ_SLICE_EXTENSION, PR_RSEQ_SLICE_EXTENSION_SET,
+		  PR_RSEQ_SLICE_EXT_ENABLE, 0, 0))
+		SKIP(return, "Time slice extension not supported\n");
+
 	ASSERT_EQ(sched_getaffinity(0, sizeof(affinity), &affinity), 0);
 
 	/* Pin it on a single CPU. Avoid CPU 0 */
@@ -137,11 +144,6 @@ FIXTURE_SETUP(slice_ext)
 		break;
 	}
 
-	ASSERT_EQ(rseq_register_current_thread(), 0);
-
-	ASSERT_EQ(prctl(PR_RSEQ_SLICE_EXTENSION, PR_RSEQ_SLICE_EXTENSION_SET,
-			PR_RSEQ_SLICE_EXT_ENABLE, 0, 0), 0);
-
 	self->noise_params.noise_nsecs = variant->noise_nsecs;
 	self->noise_params.sleep_nsecs = variant->sleep_nsecs;
 	self->noise_params.run = 1;