linux-kernel - Re: [QUICKLIST 1/5] Quicklists for page table pages V3

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Message-ID: <17919.20743.384741.398444@cargo.ozlabs.ibm.com>
Date:	Tue, 20 Mar 2007 14:12:07 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Christoph Lameter <clameter@....com>
Cc:	akpm@...ux-foundation.org, linux-mm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [QUICKLIST 1/5] Quicklists for page table pages V3

Christoph Lameter writes:

> +static inline void *quicklist_alloc(int nr, gfp_t flags, void (*ctor)(void *))
> +{

...

> +	p = (void *)__get_free_page(flags | __GFP_ZERO);

This will cause problems on 64-bit powerpc, at least with 4k pages,
since the pmd and pgd levels only use 1/4 of a page.

Paul.
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