linux-kernel - Re: [patch 7/7] powerpc: lockless get_user_pages

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Message-ID: <Pine.LNX.4.64.0806101159110.17798@schroedinger.engr.sgi.com>
Date:	Tue, 10 Jun 2008 12:00:48 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	npiggin@...e.de
cc:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org, paulus@...ba.org
Subject: Re: [patch 7/7] powerpc: lockless get_user_pages_fast

On Thu, 5 Jun 2008, npiggin@...e.de wrote:

> Index: linux-2.6/include/linux/mm.h
> ===================================================================
> --- linux-2.6.orig/include/linux/mm.h
> +++ linux-2.6/include/linux/mm.h
> @@ -244,7 +244,7 @@ static inline int put_page_testzero(stru
>   */
>  static inline int get_page_unless_zero(struct page *page)
>  {
> -	VM_BUG_ON(PageTail(page));
> +	VM_BUG_ON(PageCompound(page));
>  	return atomic_inc_not_zero(&page->_count);
>  }

This is reversing the modification to make get_page_unless_zero() usable 
with compound page heads. Will break the slab defrag patchset.


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