linux-kernel - Re: [PATCH, 3.18] sleeping function called from invalid context

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Message-ID: <5488F432.5010405@redhat.com>
Date:	Wed, 10 Dec 2014 20:32:34 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Daniel J Blueman <daniel@...ra.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH, 3.18] sleeping function called from invalid context

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On 12/10/2014 07:51 PM, Andy Lutomirski wrote:
> On Wed, Dec 10, 2014 at 4:49 PM, Rik van Riel <riel@...hat.com>
> wrote: On 12/10/2014 07:46 PM, Daniel J Blueman wrote:
>>>> Gah. I had some non-temporal copy changes in the wrong tree.
>>>> I'll check with a definitely clean tree and follow up if it
>>>> still occurs.
> 
> The exception handlers should definitely allow sleeping, so I
> suspect those changes may be related.
> 
>> It would be really, really nice if we could arrange for 
>> kernel_fpu_begin to be unconditionally usable in anything except
>> NMI context.  The crypto code would be much less scary, we could
>> make non-temporal copies safe, etc.  Can we have ponies, too?

Isn't it already?

I see nothing in __kernel_fpu_begin that looks like it would
ever need to sleep.

- -- 
All rights reversed
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