linux-kernel - Re: [PATCH 20/25] Do not check for compound pages during the page allocator sanity checks

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Date:	Wed, 22 Apr 2009 19:41:58 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 20/25] Do not check for compound pages during the page 
	allocator sanity checks

>> inserting VM_BUG_ON(PageTail(page)) is better?
>>
>
> We already go one further with
>
> #define PAGE_FLAGS_CHECK_AT_PREP        ((1 << NR_PAGEFLAGS) - 1)
>
> ...
>
> if (.... | (page->flags & PAGE_FLAGS_CHECK_AT_PREP))
>        bad_page(page);
>
> PG_tail is in PAGE_FLAGS_CHECK_AT_PREP so we're already checking for it
> and calling bad_page() if set.

ok, good.
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