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ring-buffer: Check if buffer exists before polling
[firefly-linux-kernel-4.4.55.git]
/
include
/
linux
/
ring_buffer.h
diff --git
a/include/linux/ring_buffer.h
b/include/linux/ring_buffer.h
index d69cf637a15a3093863cd33f09929b87d73fd0a9..49a4d6f59108f957d4534190c161344981c48e46 100644
(file)
--- a/
include/linux/ring_buffer.h
+++ b/
include/linux/ring_buffer.h
@@
-97,7
+97,7
@@
__ring_buffer_alloc(unsigned long size, unsigned flags, struct lock_class_key *k
__ring_buffer_alloc((size), (flags), &__key); \
})
__ring_buffer_alloc((size), (flags), &__key); \
})
-
void
ring_buffer_wait(struct ring_buffer *buffer, int cpu);
+
int
ring_buffer_wait(struct ring_buffer *buffer, int cpu);
int ring_buffer_poll_wait(struct ring_buffer *buffer, int cpu,
struct file *filp, poll_table *poll_table);
int ring_buffer_poll_wait(struct ring_buffer *buffer, int cpu,
struct file *filp, poll_table *poll_table);