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

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Message-ID: <511A5995.5000607@parrot.com>
Date:	Tue, 12 Feb 2013 16:02:45 +0100
From:	Matthieu CASTET <matthieu.castet@...rot.com>
To:	Will Deacon <will.deacon@....com>
CC:	André Hentschel <nerv@...ncrow.de>,
	"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

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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