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Commit fb0e7942 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

[PATCH] reduce MAX_NR_ZONES: make ZONE_DMA32 optional 



Make ZONE_DMA32 optional

- Add #ifdefs around ZONE_DMA32 specific code and definitions.

- Add CONFIG_ZONE_DMA32 config option and use that for x86_64
  that alone needs this zone.

- Remove the use of CONFIG_DMA_IS_DMA32 and CONFIG_DMA_IS_NORMAL
  for ia64 and fix up the way per node ZVCs are calculated.

- Fall back to prior GFP_ZONEMASK of 0x03 if there is no
  DMA32 zone.

Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 2f1b6248

arch/ia64/Kconfig

+0 −9
Original line number Diff line number Diff line
@@ -66,15 +66,6 @@ config IA64_UNCACHED_ALLOCATOR 
	bool

	select GENERIC_ALLOCATOR



config DMA_IS_DMA32

	bool

	default y



config DMA_IS_NORMAL

	bool

	depends on IA64_SGI_SN2

	default y



config AUDIT_ARCH

	bool

	default y

arch/x86_64/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -24,6 +24,10 @@ config X86 
	bool

	default y



config ZONE_DMA32

	bool

	default y



config LOCKDEP_SUPPORT

	bool

	default y

include/linux/gfp.h

+1 −1
Original line number Diff line number Diff line
@@ -13,7 +13,7 @@ struct vm_area_struct; 
/* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low three bits) */

#define __GFP_DMA	((__force gfp_t)0x01u)

#define __GFP_HIGHMEM	((__force gfp_t)0x02u)

#ifdef CONFIG_DMA_IS_DMA32

#ifndef CONFIG_ZONE_DMA32

#define __GFP_DMA32	((__force gfp_t)0x01)	/* ZONE_DMA is ZONE_DMA32 */

#elif BITS_PER_LONG < 64

#define __GFP_DMA32	((__force gfp_t)0x00)	/* ZONE_NORMAL is ZONE_DMA32 */

include/linux/mmzone.h

+13 −3
Original line number Diff line number Diff line
@@ -109,12 +109,14 @@ enum zone_type { 
	 * 			<16M.

	 */

	ZONE_DMA,

#ifdef CONFIG_ZONE_DMA32

	/*

	 * x86_64 needs two ZONE_DMAs because it supports devices that are

	 * only able to do DMA to the lower 16M but also 32 bit devices that

	 * can only do DMA areas below 4G.

	 */

	ZONE_DMA32,

#endif

	/*

	 * Normal addressable memory is in ZONE_NORMAL. DMA operations can be

	 * performed on pages in ZONE_NORMAL if the DMA devices support
@@ -161,10 +163,14 @@ enum zone_type { 
 *

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

 */

#define GFP_ZONEMASK	0x07

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

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



#ifdef CONFIG_ZONE_DMA32

#define GFP_ZONEMASK		0x07

#else

#define GFP_ZONEMASK		0x03

#endif



struct zone {

	/* Fields commonly accessed by the page allocator */

	unsigned long		free_pages;
@@ -429,7 +435,11 @@ static inline int is_normal(struct zone *zone) 


static inline int is_dma32(struct zone *zone)

{

#ifdef CONFIG_ZONE_DMA32

	return zone == zone->zone_pgdat->node_zones + ZONE_DMA32;

#else

	return 0;

#endif

}



static inline int is_dma(struct zone *zone)

include/linux/vmstat.h

+1 −3
Original line number Diff line number Diff line
@@ -124,12 +124,10 @@ static inline unsigned long node_page_state(int node, 
	struct zone *zones = NODE_DATA(node)->node_zones;



	return

#ifndef CONFIG_DMA_IS_NORMAL

#if !defined(CONFIG_DMA_IS_DMA32) && BITS_PER_LONG >= 64

#ifdef CONFIG_ZONE_DMA32

		zone_page_state(&zones[ZONE_DMA32], item) +

#endif

		zone_page_state(&zones[ZONE_NORMAL], item) +

#endif

#ifdef CONFIG_HIGHMEM

		zone_page_state(&zones[ZONE_HIGHMEM], item) +

#endif