From: Lai Jiangshan <laijs@cn.fujitsu.com>
Date: Wed, 17 Dec 2008 09:48:23 +0000 (+0800)
Subject: tracing/ring-buffer: remove unused ring_buffer size
X-Git-Tag: firefly_0821_release~13991^2~406^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6d102bc68f3dd2ae0e305b09170b1751aa67baeb;p=firefly-linux-kernel-4.4.55.git

tracing/ring-buffer: remove unused ring_buffer size

Impact: remove dead code

struct ring_buffer.size is not set after ring_buffer is initialized
or resized. it is always 0.

we can use "buffer->pages * PAGE_SIZE" to get ring_buffer's size

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index eab81f918f6a..bb6922a931b1 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -258,7 +258,6 @@ struct ring_buffer_per_cpu {
 };
 
 struct ring_buffer {
-	unsigned long			size;
 	unsigned			pages;
 	unsigned			flags;
 	int				cpus;
@@ -2210,8 +2209,7 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
 		return -EINVAL;
 
 	/* At least make sure the two buffers are somewhat the same */
-	if (buffer_a->size != buffer_b->size ||
-	    buffer_a->pages != buffer_b->pages)
+	if (buffer_a->pages != buffer_b->pages)
 		return -EINVAL;
 
 	cpu_buffer_a = buffer_a->buffers[cpu];