[PATCH] ring-buffer: Returns 0 on success from ring_buffer_resize()

[Qiujun Huang]

We don't need to check the new buffer size, and the return value
had confused resize_buffer_duplicate_size().
...
        ret = ring_buffer_resize(trace_buf->buffer,
                per_cpu_ptr(size_buf->data,cpu_id)->entries, cpu_id);
        if (ret == 0)
                per_cpu_ptr(trace_buf->data, cpu_id)->entries =
                        per_cpu_ptr(size_buf->data, cpu_id)->entries;
...

Signed-off-by: Qiujun Huang <hqjag...@gmail.com>
---
 kernel/trace/ring_buffer.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 93ef0ab6ea20..3b5f8ec3781e 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1952,18 +1952,18 @@ int ring_buffer_resize(struct trace_buffer *buffer, 
unsigned long size,
 {
        struct ring_buffer_per_cpu *cpu_buffer;
        unsigned long nr_pages;
-       int cpu, err = 0;
+       int cpu, err;
 
        /*
         * Always succeed at resizing a non-existent buffer:
         */
        if (!buffer)
-               return size;
+               return 0;
 
        /* Make sure the requested buffer exists */
        if (cpu_id != RING_BUFFER_ALL_CPUS &&
            !cpumask_test_cpu(cpu_id, buffer->cpumask))
-               return size;
+               return 0;
 
        nr_pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
 
@@ -2119,7 +2119,7 @@ int ring_buffer_resize(struct trace_buffer *buffer, 
unsigned long size,
        }
 
        mutex_unlock(&buffer->mutex);
-       return size;
+       return 0;
 
  out_err:
        for_each_buffer_cpu(buffer, cpu) {
-- 
2.17.1