linux-kernel - [patch] Fix crash due to missing debugctlmsr on AMD K6-3

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Message-ID: <20080722120047.GA6795@host0.dyn.jankratochvil.net>
Date:	Tue, 22 Jul 2008 14:00:47 +0200
From:	Jan Kratochvil <jan.kratochvil@...hat.com>
To:	linux-kernel@...r.kernel.org
Subject: [patch] Fix crash due to missing debugctlmsr on AMD K6-3

Hi,

currently if you use PTRACE_SINGLEBLOCK on AMD K6-3 (i586) it will crash.
Kernel now wrongly assumes existing DEBUGCTLMSR MSR register there.

Removed the assumption also for some other non-K6 CPUs but I am not sure there
(but it can only bring small inefficiency there if my assumption is wrong).

Based on info from Roland McGrath, Chuck Ebbert and Mikulas Patocka.
More info at:
	https://bugzilla.redhat.com/show_bug.cgi?id=456175

Please Cc me in a reply.

Regards,
Jan

View attachment "linux-2.6.26-debugctlmsr-k6.patch" of type "text/plain" (481 bytes)