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

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commit 0a1754b2a97efa644aa6e84d1db5b17c42251483 upstream.

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: d60da506cb ("tracing: Add a resize function to make one buffer equivalent to another buffer")
Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Qiujun Huang 2020-10-19 22:22:42 +08:00 committed by Greg Kroah-Hartman
parent f870895527
commit 57ebe91029
1 changed files with 4 additions and 4 deletions
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8
kernel/trace/ring_buffer.c
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@ -1692,18 +1692,18 @@ int ring_buffer_resize(struct ring_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);
@ -1843,7 +1843,7 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size,
}
mutex_unlock(&buffer->mutex);
return size;
return 0;
out_err:
for_each_buffer_cpu(buffer, cpu) {