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authorJens Axboe <axboe@kernel.dk>2023-06-13 08:31:58 -0600
committerJens Axboe <axboe@kernel.dk>2023-09-29 02:37:05 -0600
commit5177c0cb306a8628bafbf1e6b7aa7e1b7436b8dc (patch)
tree9d8275cfaf32430e27f3a1f12d4772ba0b465eb9 /kernel/futex
parent8af1692616d993c93a080865a7f19506733aa462 (diff)
futex: make futex_parse_waitv() available as a helper
To make it more generically useful, augment it with allowing the caller to pass in the wake handler and wake data. Convert the futex_waitv() syscall, passing in the default handlers. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'kernel/futex')
-rw-r--r--kernel/futex/futex.h5
-rw-r--r--kernel/futex/syscalls.c16
2 files changed, 16 insertions, 5 deletions
diff --git a/kernel/futex/futex.h b/kernel/futex/futex.h
index 76f6c2e0f539..6b6a6b3da103 100644
--- a/kernel/futex/futex.h
+++ b/kernel/futex/futex.h
@@ -361,6 +361,11 @@ struct futex_vector {
struct futex_q q;
};
+extern int futex_parse_waitv(struct futex_vector *futexv,
+ struct futex_waitv __user *uwaitv,
+ unsigned int nr_futexes, futex_wake_fn *wake,
+ void *wake_data);
+
extern int futex_wait_multiple(struct futex_vector *vs, unsigned int count,
struct hrtimer_sleeper *to);
diff --git a/kernel/futex/syscalls.c b/kernel/futex/syscalls.c
index 2b5cafdfdc50..4b6da9116aa6 100644
--- a/kernel/futex/syscalls.c
+++ b/kernel/futex/syscalls.c
@@ -184,12 +184,15 @@ SYSCALL_DEFINE6(futex, u32 __user *, uaddr, int, op, u32, val,
* @futexv: Kernel side list of waiters to be filled
* @uwaitv: Userspace list to be parsed
* @nr_futexes: Length of futexv
+ * @wake: Wake to call when futex is woken
+ * @wake_data: Data for the wake handler
*
* Return: Error code on failure, 0 on success
*/
-static int futex_parse_waitv(struct futex_vector *futexv,
- struct futex_waitv __user *uwaitv,
- unsigned int nr_futexes)
+int futex_parse_waitv(struct futex_vector *futexv,
+ struct futex_waitv __user *uwaitv,
+ unsigned int nr_futexes, futex_wake_fn *wake,
+ void *wake_data)
{
struct futex_waitv aux;
unsigned int i;
@@ -214,6 +217,8 @@ static int futex_parse_waitv(struct futex_vector *futexv,
futexv[i].w.val = aux.val;
futexv[i].w.uaddr = aux.uaddr;
futexv[i].q = futex_q_init;
+ futexv[i].q.wake = wake;
+ futexv[i].q.wake_data = wake_data;
}
return 0;
@@ -306,7 +311,8 @@ SYSCALL_DEFINE5(futex_waitv, struct futex_waitv __user *, waiters,
goto destroy_timer;
}
- ret = futex_parse_waitv(futexv, waiters, nr_futexes);
+ ret = futex_parse_waitv(futexv, waiters, nr_futexes, futex_wake_mark,
+ NULL);
if (!ret)
ret = futex_wait_multiple(futexv, nr_futexes, timeout ? &to : NULL);
@@ -421,7 +427,7 @@ SYSCALL_DEFINE4(futex_requeue,
if (!waiters)
return -EINVAL;
- ret = futex_parse_waitv(futexes, waiters, 2);
+ ret = futex_parse_waitv(futexes, waiters, 2, futex_wake_mark, NULL);
if (ret)
return ret;