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[S390] Optional ZONE_DMA for s390.

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Disable ZONE_DMA on 31-bit. All memory is addressable by all
devices and we do not need any special memory pool.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2007-02-21 10:55:12 +01:00 committed by Martin Schwidefsky
parent 63db6e8d41
commit 118bcd31b3
2 changed files with 4 additions and 2 deletions
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4
arch/s390/Kconfig
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@ -8,8 +8,8 @@ config MMU
default y
config ZONE_DMA
bool
default y
def_bool y
depends on 64BIT
config LOCKDEP_SUPPORT
bool

2
arch/s390/mm/init.c
View file

@ -141,7 +141,9 @@ void __init paging_init(void)
__raw_local_irq_ssm(ssm_mask);
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
#ifdef CONFIG_ZONE_DMA
max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
#endif
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
free_area_init_nodes(max_zone_pfns);
}