linux-kernel - Re: [PATCH 05/12] mm: alloc_contig

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Date:	Thu, 31 Mar 2011 09:02:41 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-media@...r.kernel.org,
	linux-mm@...ck.org, Michal Nazarewicz <mina86@...a86.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Ankita Garg <ankita@...ibm.com>,
	Daniel Walker <dwalker@...eaurora.org>,
	Johan MOSSBERG <johan.xx.mossberg@...ricsson.com>,
	Mel Gorman <mel@....ul.ie>, Pawel Osciak <pawel@...iak.com>
Subject: Re: [PATCH 05/12] mm: alloc_contig_range() added

On Thu, 2011-03-31 at 15:16 +0200, Marek Szyprowski wrote:
> +       ret = 0;
> +       while (!PageBuddy(pfn_to_page(start & (~0UL << ret))))
> +               if (WARN_ON(++ret >= MAX_ORDER))
> +                       return -EINVAL; 

Holy cow, that's dense.  Is there really no more straightforward way to
do that?

In any case, please pull the ++ret bit out of the WARN_ON().  Some
people like to do:

#define WARN_ON(...) do{}while(0)

to save space on some systems.  

-- Dave

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