From 0f4b5f972216782a4acb1ae00dcb55173847c2ff Mon Sep 17 00:00:00 2001 From: "peterz@infradead.org" Date: Thu, 21 Sep 2023 12:45:15 +0200 Subject: 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) Reviewed-by: Thomas Gleixner Acked-by: Geert Uytterhoeven Link: https://lore.kernel.org/r/20230921105248.511860556@noisy.programming.kicks-ass.net --- arch/xtensa/kernel/syscalls/syscall.tbl | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/xtensa/kernel/syscalls/syscall.tbl') diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl index ac278dbce2ee..dd71ecce8b86 100644 --- a/arch/xtensa/kernel/syscalls/syscall.tbl +++ b/arch/xtensa/kernel/syscalls/syscall.tbl @@ -425,3 +425,4 @@ 452 common fchmodat2 sys_fchmodat2 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait +456 common futex_requeue sys_futex_requeue -- cgit