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/xtensa | |
| 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/xtensa')
| -rw-r--r-- | arch/xtensa/kernel/syscalls/syscall.tbl | 1 |
1 files changed, 1 insertions, 0 deletions
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 |