[PATCH] ring_buffer: remove unused ring_buffer size

[Lai Jiangshan <laijs@cn.fujitsu.com>]

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

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

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 668bbb5..7c7ec06 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -202,7 +202,6 @@ struct ring_buffer_per_cpu {
 };
 
 struct ring_buffer {
-	unsigned long			size;
 	unsigned			pages;
 	unsigned			flags;
 	int				cpus;
@@ -2090,8 +2089,7 @@ 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];