[PATCH 5/8] kernel/ring_buffer: rb_per_cpu_empty can be boolean

From: Yaowei Bai
Date: Tue Sep 29 2015 - 10:46:35 EST


This patch makes rb_per_cpu_empty return bool to improve readability.

No functional change.

Signed-off-by: Yaowei Bai <bywxiaobai@xxxxxxx>
---
kernel/trace/ring_buffer.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index fc9ce12..a228789 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -3039,7 +3039,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
}
EXPORT_SYMBOL_GPL(ring_buffer_write);

-static int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
+static bool rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
{
struct buffer_page *reader = cpu_buffer->reader_page;
struct buffer_page *head = rb_set_head_page(cpu_buffer);
@@ -3047,7 +3047,7 @@ static int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)

/* In case of error, head will be NULL */
if (unlikely(!head))
- return 1;
+ return true;

return reader->read == rb_page_commit(reader) &&
(commit == reader ||
--
1.9.1


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