From: Michael Neuling <mikey@neuling.org>
Date: Fri, 14 Mar 2014 06:03:58 +0000 (+1100)
Subject: powerpc: Rate-limit users spamming kernel log buffer
X-Git-Tag: v3.15-rc1~124^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ee4ed6fa5af0009a1205498d1f754fecc7af7657;p=pandora-kernel.git

powerpc: Rate-limit users spamming kernel log buffer

The facility unavailable exception can be triggered from userspace by
accessing PMU registers when EBB is not enabled.  This causes the
included pr_err() to run, hence spamming the kernel log buffer.

This avoids this by rate limiting these messages.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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