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Commit ce2ea89b authored by Andy Whitcroft's avatar Andy Whitcroft Committed by Linus Torvalds
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[PATCH] GFP_ZONETYPES: calculate from GFP_ZONEMASK 



GFP_ZONETYPES calculate from GFP_ZONEMASK

GFP_ZONETYPES's value is directly related to the value of GFP_ZONEMASK.  It
takes one of two forms depending whether the top bit of GFP_ZONEMASK is a
'loner'.  Supply both forms, enabling the loner.

Signed-off-by: default avatarAndy Whitcroft <apw@shadowen.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 79046ae0

include/linux/mmzone.h

+4 −1
Original line number Diff line number Diff line
@@ -98,11 +98,14 @@ struct per_cpu_pageset { 
 * of three zone modifier bits, we could require up to eight zonelists.

 * If the left most zone modifier is a "loner" then the highest valid

 * zonelist would be four allowing us to allocate only five zonelists.

 * Use the first form for GFP_ZONETYPES when the left most bit is not

 * a "loner", otherwise use the second.

 *

 * NOTE! Make sure this matches the zones in <linux/gfp.h>

 */

#define GFP_ZONEMASK	0x07

#define GFP_ZONETYPES	5

/* #define GFP_ZONETYPES       (GFP_ZONEMASK + 1) */           /* Non-loner */

#define GFP_ZONETYPES  ((GFP_ZONEMASK + 1) / 2 + 1)            /* Loner */



/*

 * On machines where it is needed (eg PCs) we divide physical memory