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futex: make the vectored futex operations available

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Rename unqueue_multiple() as futex_unqueue_multiple(), and make both
that and futex_wait_multiple_setup() available for external users. This
is in preparation for wiring up vectored waits in io_uring.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-06-13 08:34:08 -06:00
parent 5177c0cb30
commit e9a56c9325
2 changed files with 10 additions and 5 deletions
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5
kernel/futex/futex.h
View File

@ -366,6 +366,11 @@ extern int futex_parse_waitv(struct futex_vector *futexv,
unsigned int nr_futexes, futex_wake_fn *wake,
void *wake_data);
extern int futex_wait_multiple_setup(struct futex_vector *vs, int count,
int *woken);
extern int futex_unqueue_multiple(struct futex_vector *v, int count);
extern int futex_wait_multiple(struct futex_vector *vs, unsigned int count,
struct hrtimer_sleeper *to);

10
kernel/futex/waitwake.c
View File

@ -372,7 +372,7 @@ void futex_wait_queue(struct futex_hash_bucket *hb, struct futex_q *q,
}
/**
* unqueue_multiple - Remove various futexes from their hash bucket
* futex_unqueue_multiple - Remove various futexes from their hash bucket
* @v: The list of futexes to unqueue
* @count: Number of futexes in the list
*
@ -382,7 +382,7 @@ void futex_wait_queue(struct futex_hash_bucket *hb, struct futex_q *q,
* - >=0 - Index of the last futex that was awoken;
* - -1 - No futex was awoken
*/
static int unqueue_multiple(struct futex_vector *v, int count)
int futex_unqueue_multiple(struct futex_vector *v, int count)
{
int ret = -1, i;
@ -410,7 +410,7 @@ static int unqueue_multiple(struct futex_vector *v, int count)
* - 0 - Success
* - <0 - -EFAULT, -EWOULDBLOCK or -EINVAL
*/
static int futex_wait_multiple_setup(struct futex_vector *vs, int count, int *woken)
int futex_wait_multiple_setup(struct futex_vector *vs, int count, int *woken)
{
struct futex_hash_bucket *hb;
bool retry = false;
@ -472,7 +472,7 @@ retry:
* was woken, we don't return error and return this index to
* userspace
*/
*woken = unqueue_multiple(vs, i);
*woken = futex_unqueue_multiple(vs, i);
if (*woken >= 0)
return 1;
@ -557,7 +557,7 @@ int futex_wait_multiple(struct futex_vector *vs, unsigned int count,
__set_current_state(TASK_RUNNING);
ret = unqueue_multiple(vs, count);
ret = futex_unqueue_multiple(vs, count);
if (ret >= 0)
return ret;