en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/rseq/legacy_check.c#7f0023215262221ca08d56be2203e8a4770be033 Merge tag 'sched-urgent-2026-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull scheduler fixes from Ingo Molnar: - Fix spurious failures in rseq self-tests (Mark Brown) - Fix rseq rseq::cpu_id_start ABI regression due to TCMalloc's creative use of the supposedly read-only field The fix is to introduce a new ABI variant based on a new (larger) rseq area registration size, to keep the TCMalloc use of rseq backwards compatible on new kernels (Thomas Gleixner) - Fix wakeup_preempt_fair() for not waking up task (Vincent Guittot) - Fix s64 mult overflow in vruntime_eligible() (Zhan Xusheng)* tag 'sched-urgent-2026-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/fair: Fix wakeup_preempt_fair() for not waking up task sched/fair: Fix overflow in vruntime_eligible() selftests/rseq: Expand for optimized RSEQ ABI v2 rseq: Reenable performance optimizations conditionally rseq: Implement read only ABI enforcement for optimized RSEQ V2 mode selftests/rseq: Validate legacy behavior selftests/rseq: Make registration flexible for legacy and optimized mode selftests/rseq: Skip tests if time slice extensions are not available rseq: Revert to historical performance killing behaviour rseq: Don't advertise time slice extensions if disabled rseq: Protect rseq_reset() against interrupts rseq: Set rseq::cpu_id_start to 0 on unregistration selftests/rseq: Don't run tests with runner scripts outside of the scripts List of files: /linux/tools/testing/selftests/rseq/legacy_check.c Sat, 09 May 2026 04:42:10 +0200 Linus Torvalds <torvalds@linux-foundation.org> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/rseq/legacy_check.c#fdf4eb632683bfc2840acebe62716cb468d43e10 selftests/rseq: Validate legacy behaviorThe RSEQ legacy mode behavior requires that the ID fields in the rseqregion are unconditionally updated on every context switch and beforesignal delivery even if not required by the ABI specification.To ensure that this behavior is preserved for legacy users in the future,add a test which validates that with a sleep() and a signal sent to self.Provide a run script which prevents GLIBC from registering a RSEQ region,so that the test can register it's own legacy sized region.Fixes: 566d8015f7ee ("rseq: Avoid CPU/MM CID updates when no event pending")Signed-off-by: Thomas Gleixner <tglx@kernel.org>Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>Reviewed-by: Dmitry Vyukov <dvyukov@google.com>Tested-by: Dmitry Vyukov <dvyukov@google.com>Link: https://patch.msgid.link/20260428224427.764705536%40kernel.orgCc: stable@vger.kernel.org List of files: /linux/tools/testing/selftests/rseq/legacy_check.c Sun, 26 Apr 2026 17:51:07 +0200 Thomas Gleixner <tglx@kernel.org>