linux-kernel - Re: [PATCH 05/10] mm, page_alloc: Use masks and shifts when converting GFP flags to migrate types

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Date:	Wed, 12 Aug 2015 09:45:45 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Mel Gorman <mgorman@...hsingularity.net>
cc:	Linux-MM <linux-mm@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Michal Hocko <mhocko@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/10] mm, page_alloc: Use masks and shifts when converting
 GFP flags to migrate types

On Wed, 12 Aug 2015, Mel Gorman wrote:

> @@ -149,14 +150,15 @@ struct vm_area_struct;
>  /* Convert GFP flags to their corresponding migrate type */
>  static inline int gfpflags_to_migratetype(const gfp_t gfp_flags)
>  {
> -	WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
> +	VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
> +	BUILD_BUG_ON(1UL << GFP_MOVABLE_SHIFT != ___GFP_MOVABLE);
> +	BUILD_BUG_ON(___GFP_MOVABLE >> GFP_MOVABLE_SHIFT != MIGRATE_MOVABLE);

Add some parenthesis here. Difficult to read. Compiler takes this as is?

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