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2026-01-22selftests/rseq: Implement time slice extension testThomas Gleixner
Provide an initial test case to evaluate the functionality. This needs to be extended to cover the ABI violations and expose the race condition between observing granted and arriving in rseq_slice_yield(). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://patch.msgid.link/20251215155709.320325431@linutronix.de