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JIRA: https://issues.redhat.com/browse/RHEL-28616 commit 0f4b5f972216782a4acb1ae00dcb55173847c2ff Author: peterz@infradead.org <peterz@infradead.org> Date: Thu, 21 Sep 2023 12:45:15 +0200 futex: Add sys_futex_requeue() Finish off the 'simple' futex2 syscall group by adding sys_futex_requeue(). Unlike sys_futex_{wait,wake}() its arguments are too numerous to fit into a regular syscall. As such, use struct futex_waitv to pass the 'source' and 'destination' futexes to the syscall. This syscall implements what was previously known as FUTEX_CMP_REQUEUE and uses {val, uaddr, flags} for source and {uaddr, flags} for destination. This design explicitly allows requeueing between different types of futex by having a different flags word per uaddr. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Link: https://lore.kernel.org/r/20230921105248.511860556@noisy.programming.kicks-ass.net Signed-off-by: Waiman Long <longman@redhat.com> |
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