From: Jan Beulich <jbeulich@novell.com>
Date: Mon, 10 Mar 2008 13:11:17 +0000 (+0000)
Subject: x86: prevent unconditional writes to DebugCtl MSR
X-Git-Tag: v2.6.26-rc1~1154^2~418
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b0e508415a83989fe704b4718a1a214bc333ca7;p=pandora-kernel.git

x86: prevent unconditional writes to DebugCtl MSR

Otherwise, enabling (or better, subsequent disabling) of single
stepping would cause a kernel oops on CPUs not having this MSR.

The patch could have been added a conditional to the MSR write in
user_disable_single_step(), but centralizing the updates seems safer
and (looking forward) better manageable.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Markus Metzger <markus.t.metzger@intel.com>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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