From 10e83fd01ccbb7122ad2c9dce68fb01bebb3fc46 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
Date: Wed, 23 Jul 2014 19:45:12 -0400
Subject: [PATCH] ring-buffer: Use rb_page_size() instead of open coded
 head_page size

There's a helper function to get a ring buffer page size (the number
of bytes of data recorded on the page), called rb_page_size().
Use that instead of open coding it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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