From: Steven Rostedt <rostedt@goodmis.org>
Date: Fri, 31 Oct 2008 13:58:35 +0000 (-0400)
Subject: tracing, ring-buffer: add paranoid checks for loops
X-Git-Tag: v2.6.28-rc4~90^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=818e3dd30a4ff34fff6d90e87ae59c73f6a53691;p=pandora-kernel.git

tracing, ring-buffer: add paranoid checks for loops

While writing a new tracer, I had a bug where I caused the ring-buffer
to recurse in a bad way. The bug was with the tracer I was writing
and not the ring-buffer itself. But it took a long time to find the
problem.

This patch adds paranoid checks into the ring-buffer infrastructure
that will catch bugs of this nature.

Note: I put the bug back in the tracer and this patch showed the error
      nicely and prevented the lockup.

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

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