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authorpeterz@infradead.org <peterz@infradead.org>2023-09-21 12:45:15 +0200
committerPeter Zijlstra <peterz@infradead.org>2023-09-21 19:22:10 +0200
commit0f4b5f972216782a4acb1ae00dcb55173847c2ff (patch)
tree710b4dc70ea653c5fc01f9882a96a6dbc3e61778 /arch/alpha
parent27b88f3519e72d71c8cead6b835a26c171109c9b (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/alpha')
-rw-r--r--arch/alpha/kernel/syscalls/syscall.tbl1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
index c49f12fd264e..b1865f9bb31e 100644
--- a/arch/alpha/kernel/syscalls/syscall.tbl
+++ b/arch/alpha/kernel/syscalls/syscall.tbl
@@ -494,3 +494,4 @@
562 common fchmodat2 sys_fchmodat2
563 common futex_wake sys_futex_wake
564 common futex_wait sys_futex_wait
+565 common futex_requeue sys_futex_requeue