diff options
author | peterz@infradead.org <peterz@infradead.org> | 2023-09-21 12:45:15 +0200 |
---|---|---|
committer | Peter Zijlstra <peterz@infradead.org> | 2023-09-21 19:22:10 +0200 |
commit | 0f4b5f972216782a4acb1ae00dcb55173847c2ff (patch) | |
tree | 710b4dc70ea653c5fc01f9882a96a6dbc3e61778 /arch/arm64/include/asm/unistd32.h | |
parent | 27b88f3519e72d71c8cead6b835a26c171109c9b (diff) |
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
Diffstat (limited to 'arch/arm64/include/asm/unistd32.h')
-rw-r--r-- | arch/arm64/include/asm/unistd32.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h index 6e7d37282ba1..c453291154fd 100644 --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -915,6 +915,8 @@ __SYSCALL(__NR_fchmodat2, sys_fchmodat2) __SYSCALL(__NR_futex_wake, sys_futex_wake) #define __NR_futex_wait 455 __SYSCALL(__NR_futex_wait, sys_futex_wait) +#define __NR_futex_requeue 456 +__SYSCALL(__NR_futex_requeue, sys_futex_requeue) /* * Please add new compat syscalls above this comment and update |