path: root/fs/eventfd.c
diff options
authorSha Zhengju <handai.szj@taobao.com>2012-05-31 16:26:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-31 17:49:32 -0700
commitee62c6b2dc93c09585b51fad18449dc5edb9977f (patch)
tree538f5338f6a00d1a4cee9e69ba74082747a452aa /fs/eventfd.c
parent71ca97da9d027009d318d319cbacf54a72f666c1 (diff)
eventfd: change int to __u64 in eventfd_signal()
eventfd_ctx->count is an __u64 counter which is allowed to reach ULLONG_MAX. eventfd_write() adds a __u64 value to "count", but the kernel side eventfd_signal() only adds an int value to it. Make them consistent. [akpm@linux-foundation.org: update interface documentation] Signed-off-by: Sha Zhengju <handai.szj@taobao.com> Cc: Davide Libenzi <davidel@xmailserver.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/eventfd.c')
1 files changed, 4 insertions, 8 deletions
diff --git a/fs/eventfd.c b/fs/eventfd.c
index dba15fecf23..d81b9f65408 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -46,20 +46,16 @@ struct eventfd_ctx {
* value, and we signal this as overflow condition by returining a POLLERR
* to poll(2).
- * Returns @n in case of success, a non-negative number lower than @n in case
- * of overflow, or the following error codes:
- *
- * -EINVAL : The value of @n is negative.
+ * Returns the amount by which the counter was incrememnted. This will be less
+ * than @n if the counter has overflowed.
-int eventfd_signal(struct eventfd_ctx *ctx, int n)
+__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n)
unsigned long flags;
- if (n < 0)
- return -EINVAL;
spin_lock_irqsave(&ctx->wqh.lock, flags);
if (ULLONG_MAX - ctx->count < n)
- n = (int) (ULLONG_MAX - ctx->count);
+ n = ULLONG_MAX - ctx->count;
ctx->count += n;
if (waitqueue_active(&ctx->wqh))
wake_up_locked_poll(&ctx->wqh, POLLIN);