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 eab81f918f6a0afe40cf5bcfb6f1e869213c26a4..bb6922a931b1de1a2fc586ef702e7f82a8e2d281 100644 (file)
--- 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];