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| 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 /kernel/sys_ni.c | |
| parent | 27b88f3519e72d71c8cead6b835a26c171109c9b (diff) | |
| download | linux-0f4b5f972216782a4acb1ae00dcb55173847c2ff.tar.gz linux-0f4b5f972216782a4acb1ae00dcb55173847c2ff.tar.bz2 linux-0f4b5f972216782a4acb1ae00dcb55173847c2ff.zip | |
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 'kernel/sys_ni.c')
| -rw-r--r-- | kernel/sys_ni.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index 13df391194e2..9db51ea373b0 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -89,6 +89,7 @@ COND_SYSCALL_COMPAT(get_robust_list); COND_SYSCALL(futex_waitv); COND_SYSCALL(futex_wake); COND_SYSCALL(futex_wait); +COND_SYSCALL(futex_requeue); COND_SYSCALL(kexec_load); COND_SYSCALL_COMPAT(kexec_load); COND_SYSCALL(init_module); |