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eventfd: use wait_event_interruptible_locked_irq() helper

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wait_event_interruptible_locked_irq was introduced by commit 22c43c81a5
("wait_event_interruptible_locked() interface"), but older code such as
eventfd_{write,read} still uses the open code implementation.
Inspired by commit 8120a8aadb
("fs/timerfd.c: make use of wait_event_interruptible_locked_irq()"), this
patch replaces the open code implementation with a single macro call.

No functional change intended.

Signed-off-by: Wen Yang <wenyang.linux@foxmail.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dylan Yudaken <dylany@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Fu Wei <wefu@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Michal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Message-Id: <tencent_16F9553E8354D950D704214D6EA407315F0A@qq.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Wen Yang 2023-04-06 03:20:02 +08:00 committed by Christian Brauner
parent 983652c691
commit 113348a44b
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 7 additions and 34 deletions
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41
fs/eventfd.c
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@ -228,7 +228,6 @@ static ssize_t eventfd_read(struct kiocb *iocb, struct iov_iter *to)
struct file *file = iocb->ki_filp;
struct eventfd_ctx *ctx = file->private_data;
__u64 ucnt = 0;
DECLARE_WAITQUEUE(wait, current);
if (iov_iter_count(to) < sizeof(ucnt))
return -EINVAL;
@ -239,23 +238,11 @@ static ssize_t eventfd_read(struct kiocb *iocb, struct iov_iter *to)
spin_unlock_irq(&ctx->wqh.lock);
return -EAGAIN;
}
__add_wait_queue(&ctx->wqh, &wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (ctx->count)
break;
if (signal_pending(current)) {
__remove_wait_queue(&ctx->wqh, &wait);
__set_current_state(TASK_RUNNING);
spin_unlock_irq(&ctx->wqh.lock);
return -ERESTARTSYS;
}
if (wait_event_interruptible_locked_irq(ctx->wqh, ctx->count)) {
spin_unlock_irq(&ctx->wqh.lock);
schedule();
spin_lock_irq(&ctx->wqh.lock);
return -ERESTARTSYS;
}
__remove_wait_queue(&ctx->wqh, &wait);
__set_current_state(TASK_RUNNING);
}
eventfd_ctx_do_read(ctx, &ucnt);
current->in_eventfd = 1;
@ -275,7 +262,6 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
struct eventfd_ctx *ctx = file->private_data;
ssize_t res;
__u64 ucnt;
DECLARE_WAITQUEUE(wait, current);
if (count < sizeof(ucnt))
return -EINVAL;
@ -288,23 +274,10 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
if (ULLONG_MAX - ctx->count > ucnt)
res = sizeof(ucnt);
else if (!(file->f_flags & O_NONBLOCK)) {
__add_wait_queue(&ctx->wqh, &wait);
for (res = 0;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (ULLONG_MAX - ctx->count > ucnt) {
res = sizeof(ucnt);
break;
}
if (signal_pending(current)) {
res = -ERESTARTSYS;
break;
}
spin_unlock_irq(&ctx->wqh.lock);
schedule();
spin_lock_irq(&ctx->wqh.lock);
}
__remove_wait_queue(&ctx->wqh, &wait);
__set_current_state(TASK_RUNNING);
res = wait_event_interruptible_locked_irq(ctx->wqh,
ULLONG_MAX - ctx->count > ucnt);
if (!res)
res = sizeof(ucnt);
}
if (likely(res > 0)) {
ctx->count += ucnt;