From d47882078f05c2cb46b85f1e12a58ed9315b9d63 Mon Sep 17 00:00:00 2001
From: Steven Rostedt <srostedt@redhat.com>
Date: Wed, 17 Jun 2009 00:39:43 -0400
Subject: [PATCH] ring-buffer: add locks around rb_per_cpu_empty

The checking of whether the buffer is empty or not needs to be serialized
among the readers. Add the reader spin lock around it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Reading git-format-patch failed