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[PATCH] bootmem: use MAX_DMA_ADDRESS instead of LOW32LIMIT 

Introduce ARCH_LOW_ADDRESS_LIMIT which can be set per architecture to
override the 4GB default limit used by the bootmem allocater within
__alloc_bootmem_low() and __alloc_bootmem_low_node().  E.g.  s390 needs a
2GB limit instead of 4GB.

Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Heiko Carstens 2006-09-25 23:31:33 -07:00 committed by Linus Torvalds
parent b72f160443
commit dfd54cbcc0
2 changed files with 10 additions and 3 deletions
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2
include/asm-s390/processor.h
View File

@ -337,6 +337,8 @@ struct notifier_block;
int register_idle_notifier(struct notifier_block *nb);
int unregister_idle_notifier(struct notifier_block *nb);
#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
#endif
/*

11
mm/bootmem.c
View File

@ -15,6 +15,7 @@
#include <asm/bug.h>
#include <asm/io.h>
#include <asm/processor.h>
#include "internal.h"
@ -453,7 +454,9 @@ void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
return __alloc_bootmem(size, align, goal);
}
#define LOW32LIMIT 0xffffffff
#ifndef ARCH_LOW_ADDRESS_LIMIT
#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
#endif
void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
unsigned long goal)
@ -462,7 +465,8 @@ void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
void *ptr;
list_for_each_entry(bdata, &bdata_list, list) {
ptr = __alloc_bootmem_core(bdata, size, align, goal, LOW32LIMIT);
ptr = __alloc_bootmem_core(bdata, size, align, goal,
ARCH_LOW_ADDRESS_LIMIT);
if (ptr)
return ptr;
}
@ -478,5 +482,6 @@ void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
unsigned long align, unsigned long goal)
{
return __alloc_bootmem_core(pgdat->bdata, size, align, goal, LOW32LIMIT);
return __alloc_bootmem_core(pgdat->bdata, size, align, goal,
ARCH_LOW_ADDRESS_LIMIT);
}