Re: [PATCH 24/27] Convert gfp_zone() to use a table of precalculatedvalues

[Christoph Lameter]

On Mon, 16 Mar 2009, Mel Gorman wrote:

> +int gfp_zone_table[GFP_ZONEMASK] __read_mostly;

The gfp_zone_table is compile time determinable. There is no need to
calculate it.

const int gfp_zone_table[GFP_ZONEMASK] = {
	ZONE_NORMAL,		/* 00 No flags set */
	ZONE_DMA,		/* 01 Only GFP_DMA set */
	ZONE_HIGHMEM,		/* 02 Only GFP_HIGHMEM set */
	ZONE_DMA,		/* 03 GFP_HIGHMEM and GFP_DMA set */
	ZONE_DMA32,		/* 04 Only GFP_DMA32 set */
	ZONE_DMA,		/* 05 GFP_DMA and GFP_DMA32 set */
	ZONE_DMA32,		/* 06 GFP_DMA32 and GFP_HIGHMEM set */
	ZONE_DMA,		/* 07 GFP_DMA, GFP_DMA32 and GFP_DMA32 set */
	ZONE_MOVABLE,		/* 08 Only ZONE_MOVABLE set */
	ZONE_DMA,		/* 09 MOVABLE + DMA */
	ZONE_MOVABLE,		/* 0A MOVABLE + HIGHMEM */
	ZONE_DMA,		/* 0B MOVABLE + DMA + HIGHMEM */
	ZONE_DMA32,		/* 0C MOVABLE + DMA32 */
	ZONE_DMA,		/* 0D MOVABLE + DMA + DMA32 */
	ZONE_DMA32,		/* 0E MOVABLE + DMA32 + HIGHMEM */
	ZONE_DMA		/* 0F MOVABLE + DMA32 + HIGHMEM + DMA
};

Hmmmm... Guess one would need to add some #ifdeffery here to setup
ZONE_NORMAL in cases there is no DMA, DMA32 and HIGHMEM.

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