epoll keyed wakeups: make eventfd use keyed wakeups
Davide Libenzi [Tue, 31 Mar 2009 22:24:23 +0000 (15:24 -0700)]
Introduce keyed event wakeups inside the eventfd code.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
Cc: William Lee Irwin III <wli@movementarian.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/eventfd.c

index 91c0829..2a701d5 100644 (file)
@@ -51,7 +51,7 @@ int eventfd_signal(struct file *file, int n)
                n = (int) (ULLONG_MAX - ctx->count);
        ctx->count += n;
        if (waitqueue_active(&ctx->wqh))
-               wake_up_locked(&ctx->wqh);
+               wake_up_locked_poll(&ctx->wqh, POLLIN);
        spin_unlock_irqrestore(&ctx->wqh.lock, flags);
 
        return n;
@@ -120,7 +120,7 @@ static ssize_t eventfd_read(struct file *file, char __user *buf, size_t count,
                ucnt = (ctx->flags & EFD_SEMAPHORE) ? 1 : ctx->count;
                ctx->count -= ucnt;
                if (waitqueue_active(&ctx->wqh))
-                       wake_up_locked(&ctx->wqh);
+                       wake_up_locked_poll(&ctx->wqh, POLLOUT);
        }
        spin_unlock_irq(&ctx->wqh.lock);
        if (res > 0 && put_user(ucnt, (__u64 __user *) buf))
@@ -169,7 +169,7 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
        if (likely(res > 0)) {
                ctx->count += ucnt;
                if (waitqueue_active(&ctx->wqh))
-                       wake_up_locked(&ctx->wqh);
+                       wake_up_locked_poll(&ctx->wqh, POLLIN);
        }
        spin_unlock_irq(&ctx->wqh.lock);