From: Steven Rostedt <srostedt@redhat.com>
Date: Tue, 11 Nov 2008 17:47:44 +0000 (+0100)
Subject: ring-buffer: add reader lock
X-Git-Tag: v2.6.29-rc1~586^2~76^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f83c9d0fe42a7544b4d4ffcebb2e6716fcfd95c0;p=pandora-kernel.git

ring-buffer: add reader lock

Impact: serialize reader accesses to individual CPU ring buffers

The code in the ring buffer expects only one reader at a time, but currently
it puts that requirement on the caller. This is not strong enough, and this
patch adds a "reader_lock" that serializes the access to the reader API
of the ring buffer.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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