linux-kernel - Re: mlock: Make the mlock system call interruptible by fatal

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Date:	Wed, 24 Sep 2008 09:20:40 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	sqazi@...gle.com (Salman Qazi), linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: mlock: Make the mlock system call interruptible by fatal

On Wed, 24 Sep 2008 11:22:55 +0100 Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > > Can we do
> > >
> > >        return i ? i : -EINTR;
> > >
> > > in the usual fashion?
> > 
> > Fixed.
> 
> If its only interruptible by fatal signals why do we care what the return
> is ?
> 

For the immediate in-kernel caller.  __get_user_pages() took a ref on a
few pages which the caller needs to undo before doing anything else
(like processing the signal).

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