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mm: Get rid of __ZONE_COUNT

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It was used to compensate because MAX_NR_ZONES was not available to the
#ifdefs.  Export MAX_NR_ZONES via the new mechanism and get rid of
__ZONE_COUNT.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2008-04-28 02:12:54 -07:00 committed by Linus Torvalds
parent ec7cade8c1
commit 97965478a6
2 changed files with 13 additions and 17 deletions
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28
include/linux/mmzone.h
View File

@ -3,6 +3,7 @@
#ifdef __KERNEL__ #ifdef __KERNEL__
#ifndef __ASSEMBLY__ #ifndef __ASSEMBLY__
#ifndef __GENERATING_BOUNDS_H
#include <linux/spinlock.h> #include <linux/spinlock.h>
#include <linux/list.h> #include <linux/list.h>
@ -15,6 +16,7 @@
#include <linux/seqlock.h> #include <linux/seqlock.h>
#include <linux/nodemask.h> #include <linux/nodemask.h>
#include <linux/pageblock-flags.h> #include <linux/pageblock-flags.h>
#include <linux/bounds.h>
#include <asm/atomic.h> #include <asm/atomic.h>
#include <asm/page.h> #include <asm/page.h>
@ -129,6 +131,8 @@ struct per_cpu_pageset {
#define zone_pcp(__z, __cpu) (&(__z)->pageset[(__cpu)]) #define zone_pcp(__z, __cpu) (&(__z)->pageset[(__cpu)])
#endif #endif
#endif /* !__GENERATING_BOUNDS.H */
enum zone_type { enum zone_type {
#ifdef CONFIG_ZONE_DMA #ifdef CONFIG_ZONE_DMA
/* /*
@ -177,9 +181,11 @@ enum zone_type {
ZONE_HIGHMEM, ZONE_HIGHMEM,
#endif #endif
ZONE_MOVABLE, ZONE_MOVABLE,
MAX_NR_ZONES __MAX_NR_ZONES
}; };
#ifndef __GENERATING_BOUNDS_H
/* /*
* When a memory allocation must conform to specific limitations (such * When a memory allocation must conform to specific limitations (such
* as being suitable for DMA) the caller will pass in hints to the * as being suitable for DMA) the caller will pass in hints to the
@ -188,28 +194,15 @@ enum zone_type {
* match the requested limits. See gfp_zone() in include/linux/gfp.h * match the requested limits. See gfp_zone() in include/linux/gfp.h
*/ */
/* #if MAX_NR_ZONES < 2
* Count the active zones. Note that the use of defined(X) outside
* #if and family is not necessarily defined so ensure we cannot use
* it later. Use __ZONE_COUNT to work out how many shift bits we need.
*/
#define __ZONE_COUNT ( \
defined(CONFIG_ZONE_DMA) \
+ defined(CONFIG_ZONE_DMA32) \
+ 1 \
+ defined(CONFIG_HIGHMEM) \
+ 1 \
)
#if __ZONE_COUNT < 2
#define ZONES_SHIFT 0 #define ZONES_SHIFT 0
#elif __ZONE_COUNT <= 2 #elif MAX_NR_ZONES <= 2
#define ZONES_SHIFT 1 #define ZONES_SHIFT 1
#elif __ZONE_COUNT <= 4 #elif MAX_NR_ZONES <= 4
#define ZONES_SHIFT 2 #define ZONES_SHIFT 2
#else #else
#error ZONES_SHIFT -- too many zones configured adjust calculation #error ZONES_SHIFT -- too many zones configured adjust calculation
#endif #endif
#undef __ZONE_COUNT
struct zone { struct zone {
/* Fields commonly accessed by the page allocator */ /* Fields commonly accessed by the page allocator */
@ -1008,6 +1001,7 @@ unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);
#define pfn_valid_within(pfn) (1) #define pfn_valid_within(pfn) (1)
#endif #endif
#endif /* !__GENERATING_BOUNDS.H */
#endif /* !__ASSEMBLY__ */ #endif /* !__ASSEMBLY__ */
#endif /* __KERNEL__ */ #endif /* __KERNEL__ */
#endif /* _LINUX_MMZONE_H */ #endif /* _LINUX_MMZONE_H */

2
kernel/bounds.c
View File

@ -7,6 +7,7 @@
#define __GENERATING_BOUNDS_H #define __GENERATING_BOUNDS_H
/* Include headers that define the enum constants of interest */ /* Include headers that define the enum constants of interest */
#include <linux/page-flags.h> #include <linux/page-flags.h>
#include <linux/mmzone.h>
#define DEFINE(sym, val) \ #define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val)) asm volatile("\n->" #sym " %0 " #val : : "i" (val))
@ -17,5 +18,6 @@ void foo(void)
{ {
/* The enum constants to put into include/linux/bounds.h */ /* The enum constants to put into include/linux/bounds.h */
DEFINE(NR_PAGEFLAGS, __NR_PAGEFLAGS); DEFINE(NR_PAGEFLAGS, __NR_PAGEFLAGS);
DEFINE(MAX_NR_ZONES, __MAX_NR_ZONES);
/* End of constants */ /* End of constants */
} }