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| author | peterz@infradead.org <peterz@infradead.org> | 2023-09-21 12:45:14 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-09-21 19:22:09 +0200 |
| commit | 27b88f3519e72d71c8cead6b835a26c171109c9b (patch) | |
| tree | eddca24432d8d66ed29a724219baeb24772d90b2 /kernel/futex | |
| parent | 3b63a55f498b763aba0886b244df613587a73c46 (diff) | |
| download | linux-27b88f3519e72d71c8cead6b835a26c171109c9b.tar.gz linux-27b88f3519e72d71c8cead6b835a26c171109c9b.tar.bz2 linux-27b88f3519e72d71c8cead6b835a26c171109c9b.zip | |
futex: Add flags2 argument to futex_requeue()
In order to support mixed size requeue, add a second flags argument to
the internal futex_requeue() function.
No functional change intended.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230921105248.396780136@noisy.programming.kicks-ass.net
Diffstat (limited to 'kernel/futex')
| -rw-r--r-- | kernel/futex/futex.h | 5 | ||||
| -rw-r--r-- | kernel/futex/requeue.c | 12 | ||||
| -rw-r--r-- | kernel/futex/syscalls.c | 6 |
3 files changed, 13 insertions, 10 deletions
diff --git a/kernel/futex/futex.h b/kernel/futex/futex.h index a8ea5ef52424..a06030a1a27b 100644 --- a/kernel/futex/futex.h +++ b/kernel/futex/futex.h @@ -328,8 +328,9 @@ extern int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, u32 val, ktime_t *abs_time, u32 bitset, u32 __user *uaddr2); -extern int futex_requeue(u32 __user *uaddr1, unsigned int flags, - u32 __user *uaddr2, int nr_wake, int nr_requeue, +extern int futex_requeue(u32 __user *uaddr1, unsigned int flags1, + u32 __user *uaddr2, unsigned int flags2, + int nr_wake, int nr_requeue, u32 *cmpval, int requeue_pi); extern int __futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, diff --git a/kernel/futex/requeue.c b/kernel/futex/requeue.c index 5bf69581a937..a0a79954f506 100644 --- a/kernel/futex/requeue.c +++ b/kernel/futex/requeue.c @@ -346,8 +346,9 @@ futex_proxy_trylock_atomic(u32 __user *pifutex, struct futex_hash_bucket *hb1, /** * futex_requeue() - Requeue waiters from uaddr1 to uaddr2 * @uaddr1: source futex user address - * @flags: futex flags (FLAGS_SHARED, etc.) + * @flags1: futex flags (FLAGS_SHARED, etc.) * @uaddr2: target futex user address + * @flags2: futex flags (FLAGS_SHARED, etc.) * @nr_wake: number of waiters to wake (must be 1 for requeue_pi) * @nr_requeue: number of waiters to requeue (0-INT_MAX) * @cmpval: @uaddr1 expected value (or %NULL) @@ -361,7 +362,8 @@ futex_proxy_trylock_atomic(u32 __user *pifutex, struct futex_hash_bucket *hb1, * - >=0 - on success, the number of tasks requeued or woken; * - <0 - on error */ -int futex_requeue(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2, +int futex_requeue(u32 __user *uaddr1, unsigned int flags1, + u32 __user *uaddr2, unsigned int flags2, int nr_wake, int nr_requeue, u32 *cmpval, int requeue_pi) { union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT; @@ -424,10 +426,10 @@ int futex_requeue(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2, } retry: - ret = get_futex_key(uaddr1, flags, &key1, FUTEX_READ); + ret = get_futex_key(uaddr1, flags1, &key1, FUTEX_READ); if (unlikely(ret != 0)) return ret; - ret = get_futex_key(uaddr2, flags, &key2, + ret = get_futex_key(uaddr2, flags2, &key2, requeue_pi ? FUTEX_WRITE : FUTEX_READ); if (unlikely(ret != 0)) return ret; @@ -459,7 +461,7 @@ retry_private: if (ret) return ret; - if (!(flags & FLAGS_SHARED)) + if (!(flags1 & FLAGS_SHARED)) goto retry_private; goto retry; diff --git a/kernel/futex/syscalls.c b/kernel/futex/syscalls.c index e4c8ec713787..dde9b74db9af 100644 --- a/kernel/futex/syscalls.c +++ b/kernel/futex/syscalls.c @@ -106,9 +106,9 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout, case FUTEX_WAKE_BITSET: return futex_wake(uaddr, flags, val, val3); case FUTEX_REQUEUE: - return futex_requeue(uaddr, flags, uaddr2, val, val2, NULL, 0); + return futex_requeue(uaddr, flags, uaddr2, flags, val, val2, NULL, 0); case FUTEX_CMP_REQUEUE: - return futex_requeue(uaddr, flags, uaddr2, val, val2, &val3, 0); + return futex_requeue(uaddr, flags, uaddr2, flags, val, val2, &val3, 0); case FUTEX_WAKE_OP: return futex_wake_op(uaddr, flags, uaddr2, val, val2, val3); case FUTEX_LOCK_PI: @@ -125,7 +125,7 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout, return futex_wait_requeue_pi(uaddr, flags, val, timeout, val3, uaddr2); case FUTEX_CMP_REQUEUE_PI: - return futex_requeue(uaddr, flags, uaddr2, val, val2, &val3, 1); + return futex_requeue(uaddr, flags, uaddr2, flags, val, val2, &val3, 1); } return -ENOSYS; } |