---
  fs/eventfd.c            | 2 +-
  include/linux/eventfd.h | 5 ++++-
  2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/eventfd.c b/fs/eventfd.c
index e265b6dd4f34..cc7cd1dbedd3 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c

@@ -71,7 +71,7 @@ __u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n)
  	 * it returns true, the eventfd_signal() call should be deferred to a
  	 * safe context.
  	 */
-	if (WARN_ON_ONCE(this_cpu_read(eventfd_wake_count)))
+	if (WARN_ON_ONCE(this_cpu_read(eventfd_wake_count) > EFD_WAKE_DEPTH))
  		return 0;
  
  	spin_lock_irqsave(&ctx->wqh.lock, flags);

diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h
index fa0a524baed0..886d99cd38ef 100644
--- a/include/linux/eventfd.h
+++ b/include/linux/eventfd.h

@@ -29,6 +29,9 @@
  #define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
  #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)
  
+/* Maximum recursion depth */
+#define EFD_WAKE_DEPTH 1
+
  struct eventfd_ctx;
  struct file;
  

@@ -47,7 +50,7 @@ DECLARE_PER_CPU(int, eventfd_wake_count);
  
  static inline bool eventfd_signal_count(void)
  {
-	return this_cpu_read(eventfd_wake_count);
+	return this_cpu_read(eventfd_wake_count) > EFD_WAKE_DEPTH;
  }
  
  #else /* CONFIG_EVENTFD */