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authorWen Yang <wenyang.linux@foxmail.com>2023-04-06 03:20:02 +0800
committerChristian Brauner <brauner@kernel.org>2023-04-06 10:01:50 +0200
commit113348a44b8622b497fb884f41c8659481ad0b04 (patch)
tree67849f3a3119388977221b25d592acc9720e7bcb /fs/eventfd.c
parent983652c691990b3257a07f67f4263eb847baa82d (diff)
downloadlwn-113348a44b8622b497fb884f41c8659481ad0b04.tar.gz
lwn-113348a44b8622b497fb884f41c8659481ad0b04.zip
eventfd: use wait_event_interruptible_locked_irq() helper
wait_event_interruptible_locked_irq was introduced by commit 22c43c81a51e ("wait_event_interruptible_locked() interface"), but older code such as eventfd_{write,read} still uses the open code implementation. Inspired by commit 8120a8aadb20 ("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>
Diffstat (limited to 'fs/eventfd.c')
-rw-r--r--fs/eventfd.c41
1 files changed, 7 insertions, 34 deletions
diff --git a/fs/eventfd.c b/fs/eventfd.c
index 249ca6c0b784..95850a13ce8d 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -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;