linux-kernel - Re: [PATCH] add __GFP_ZERO to GFP_LEVEL

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Date:	Tue, 24 Jul 2007 09:24:54 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Lameter <clameter@....com>
Cc:	Mel Gorman <mel@...net.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Daniel Phillips <phillips@...gle.com>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] add __GFP_ZERO to GFP_LEVEL_MASK

On Tue, 2007-07-24 at 00:09 -0700, Christoph Lameter wrote:
> On Tue, 24 Jul 2007, Peter Zijlstra wrote:
> 
> > Then we can either fixup the slab allocators to mask out __GFP_ZERO, or
> > do something like the below.
> > 
> > Personally I like the consistency of adding __GFP_ZERO here (removes
> > this odd exception) and just masking it in the sl[aou]b thingies.
> 
> There is another exception for __GFP_DMA.

non of the zone specifiers are

> > Anybody else got a preference?
> 
> >  #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
> >  
> > -/* if you forget to add the bitmask here kernel will crash, period */
> > +/*
> > + * If you forget to add the bitmask here kernel will crash, period!
> > + *
> > + * GFP_LEVEL_MASK is used to filter out the flags that are to be passed to the
> > + * page allocator.
> > + *
> 
> GFP_LEVEL_MASK is also used in mm/vmalloc.c. We need a definition that 
> goes beyond slab allocators.

Right, bugger.



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