From: Markus Metzger <markus.t.metzger@intel.com>
Date: Tue, 25 Nov 2008 07:52:56 +0000 (+0100)
Subject: x86, bts: fix wrmsr and spinlock over kmalloc
X-Git-Tag: v2.6.28-rc7~45^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=de90add30e79261c3b5be68bb0f22d2ef98e8113;p=pandora-kernel.git

x86, bts: fix wrmsr and spinlock over kmalloc

Impact: fix sleeping-with-spinlock-held bugs/crashes

- Turn a wrmsr to write the DS_AREA MSR into a wrmsrl.
- Use irqsave variants of spinlocks.
- Do not allocate memory while holding spinlocks.

Reported-by: Stephane Eranian <eranian@googlemail.com>
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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