linux-kernel - RE: debugctl msr

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Message-ID: <928CFBE8E7CB0040959E56B4EA41A77E08F1160E@irsmsx504.ger.corp.intel.com>
Date:	Fri, 21 Nov 2008 08:58:43 +0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	"eranian@...il.com" <eranian@...il.com>
CC:	Markus Metzger <markus.t.metzger@...glemail.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: debugctl msr

>-----Original Message-----
>From: stephane eranian [mailto:eranian@...glemail.com] 
>Sent: Freitag, 21. November 2008 09:48
>To: Metzger, Markus T

>> If ds_validate() is disabled, it would put the context twice.
>>
>Yes, that was my case.

The code heavily relies on ds_validate().
I would expect a lot of things to break down if ds_validate() were
disabled.


>I found the reason why in system-wide my kernel was crashing.
>It was due to the way you are writing DS_AREA_MSR in
>ds_allocate_context():
>
>                if (!task || (task == current))
>                        wrmsr(MSR_IA32_DS_AREA, (unsigned 
>long)context->ds, 0);


Thanks. I have a fix in my sandbox.


I won't be able to send the patches out this week. Especially the
interface change to introduce the handle is quite big. I should have
them early next week.


regards,
markus.
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