From: Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
Date: Wed, 17 Oct 2012 02:56:16 +0000 (+0900)
Subject: tracing: Add a resize function to make one buffer equivalent to another buffer
X-Git-Tag: v3.8-rc1~60^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d60da506cbeb3f1907a740547dd7ef04a93e908e;p=pandora-kernel.git

tracing: Add a resize function to make one buffer equivalent to another buffer

Trace buffer size is now per-cpu, so that there are the following two
patterns in resizing of buffers.

  (1) resize per-cpu buffers to same given size
  (2) resize per-cpu buffers to another trace_array's buffer size
      for each CPU (such as preparing the max_tr which is equivalent
      to the global_trace's size)

__tracing_resize_ring_buffer() can be used for (1), and had
implemented (2) inside it for resetting the global_trace to the
original size.

(2) was also implemented in another place. So this patch assembles
them in a new function - resize_buffer_duplicate_size().

Link: http://lkml.kernel.org/r/20121017025616.2627.91226.stgit@falsita

Signed-off-by: Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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