linux-kernel - Re: [PATCH] arm: Preserve TPIDRURW on context switch

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Date:	Wed, 20 Feb 2013 20:34:37 +0100
From:	André Hentschel <nerv@...ncrow.de>
To:	Matthieu CASTET <matthieu.castet@...rot.com>
CC:	Will Deacon <will.deacon@....com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm: Preserve TPIDRURW on context switch

Am 12.02.2013 16:02, schrieb Matthieu CASTET:
> Will Deacon a écrit :
>> Hi Andre,
>>
>> On Tue, Feb 12, 2013 at 02:02:59PM +0000, André Hentschel wrote:
>>> Am 08.02.2013 16:48, schrieb Will Deacon:
>>>> On Wed, Feb 06, 2013 at 11:01:23PM +0000, André Hentschel wrote:
>>>>> No, i'm not sure how to improve this. How does the process can continue, can you or someone else fix that and add his Signed-off-by?
>>>> How about something like the (completely untested) diff below?
>>>>
>>>> Andre: if this works for you, I'm happy to write a commit message etc.
>>> Thx for your effort, but it doesn't work, at least not with my 3.4.6 suse kernel.
>>> Be free to have another try, i'll be happy to test it.
>>
>> Well, cheers for testing. Can you be more specific about what goes wrong
>> please? What do you see in TPIDRURW?
>>
> The tls value is never saved to : thread->tp_value[1].
> 
> Also I don't know if you can avoid the extra ldr in the software case.
> 
> Matthieu
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Hi Will,
seems like Matthieu is right, any update on this?

-- 

Best Regards, André Hentschel
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