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

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Message-ID: <Pine.LNX.4.64.0707231558590.32630@schroedinger.engr.sgi.com>
Date:	Mon, 23 Jul 2007 16:00:24 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Daniel Phillips <phillips@...gle.com>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] add __GFP_ZERP to GFP_LEVEL_MASK

On Mon, 23 Jul 2007, Andrew Morton wrote:

> So this:
> 
> 	/*
> 	 * Be lazy and only check for valid flags here,  keeping it out of the
> 	 * critical path in kmem_cache_alloc().
> 	 */
> 	BUG_ON(flags & ~(GFP_DMA | __GFP_ZERO | GFP_LEVEL_MASK));
> 
> would no longer need the __GFP_ZERO.  Ditto in slob's new_slab().

That __GFP_ZERO is needed to avoid triggering the BUG_ON. The next line

	local_flags = (flags & GFP_LEVEL_MASK);

filters out the __GFP_ZERO before calling the page allocator.
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