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.

Signed-off-by: Sha Zhengju <handai.szj@taobao.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/eventfd.c b/fs/eventfd.c
index dba15fecf23e376f12ad2cb367424cf202d3a819..f570e7aa06d64b2e92a9cf63b61d8741347350fc 100644 (file)
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -51,15 +51,13 @@ struct eventfd_ctx {
  *
  * -EINVAL    : The value of @n is negative.
  */
-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);

diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h
index 91bb4f27238cf156cb3ecc3daac22d37684aebd3..3c3ef19a625a26a38944cb06afca97b872d48234 100644 (file)
--- a/include/linux/eventfd.h
+++ b/include/linux/eventfd.h
@@ -34,7 +34,7 @@ void eventfd_ctx_put(struct eventfd_ctx *ctx);
 struct file *eventfd_fget(int fd);
 struct eventfd_ctx *eventfd_ctx_fdget(int fd);
 struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
-int eventfd_signal(struct eventfd_ctx *ctx, int n);
+__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
 ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait, __u64 *cnt);
 int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_t *wait,
                                  __u64 *cnt);