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futex: Create helper function to initialize a hash slot

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Factor out the futex_hash_bucket initialisation into a helpr function.
The helper function will be used in a follow up patch implementing
process private hash buckets.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250416162921.513656-12-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior
2025-04-16 18:29:11 +02:00
committed by Peter Zijlstra
parent b04b8f3032
commit 9a9bdfdd68
1 changed files with 9 additions and 5 deletions
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14
kernel/futex/core.c
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@@ -1160,6 +1160,13 @@ void futex_exit_release(struct task_struct *tsk)
futex_cleanup_end(tsk, FUTEX_STATE_DEAD);
}
static void futex_hash_bucket_init(struct futex_hash_bucket *fhb)
{
atomic_set(&fhb->waiters, 0);
plist_head_init(&fhb->chain);
spin_lock_init(&fhb->lock);
}
static int __init futex_init(void)
{
unsigned long hashsize, i;
@@ -1177,11 +1184,8 @@ static int __init futex_init(void)
hashsize, hashsize);
hashsize = 1UL << futex_shift;
for (i = 0; i < hashsize; i++) {
atomic_set(&futex_queues[i].waiters, 0);
plist_head_init(&futex_queues[i].chain);
spin_lock_init(&futex_queues[i].lock);
}
for (i = 0; i < hashsize; i++)
futex_hash_bucket_init(&futex_queues[i]);
futex_hashmask = hashsize - 1;
return 0;