Commit 0a1754b2 authored by Qiujun Huang's avatar Qiujun Huang Committed by Steven Rostedt (VMware)

ring-buffer: Return 0 on success from ring_buffer_resize()

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;
...

Link: https://lkml.kernel.org/r/20201019142242.11560-1-hqjagain@gmail.com

Cc: stable@vger.kernel.org
Fixes: d60da506 ("tracing: Add a resize function to make one buffer equivalent to another buffer")
Signed-off-by: default avatarQiujun Huang <hqjagain@gmail.com>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent ce66f613
......@@ -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) {
......
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