linux-kernel - Re: [PATCH RFC 2/2] mm, sched: trigger might_sleep() in might

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Message-ID: <20141127182710.GA30735@redhat.com>
Date:	Thu, 27 Nov 2014 20:27:10 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	David Hildenbrand <dahi@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	paulus@...ba.org, akpm@...ux-foundation.org,
	heiko.carstens@...ibm.com, schwidefsky@...ibm.com,
	borntraeger@...ibm.com, tglx@...utronix.de, David.Laight@...LAB.COM
Subject: Re: [PATCH RFC 2/2] mm, sched: trigger might_sleep() in
 might_fault() when pagefaults are disabled

On Thu, Nov 27, 2014 at 07:08:42PM +0100, David Hildenbrand wrote:
> > > > -
> > > > -	__might_sleep(__FILE__, __LINE__, 0);
> > > > +	if (unlikely(!pagefault_disabled()))
> > > > +		__might_sleep(__FILE__, __LINE__, 0);
> > > >    
> > 
> > Same here: so maybe make might_fault a wrapper
> > around __might_fault as well.
> 
> Yes, I also noticed that. It was part of the original code.
> For now I kept this revert as close as possible to
> the original patch.
> 
> Better fix this in an add-on patch? Or directly in this commit?

IMHO it's up to you really.

> At least for
> the in-header function it is easy to fix in this patch.
> 
> Thanks!

Right.
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