Commit 118bcd31 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

[S390] Optional ZONE_DMA for s390. 



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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 63db6e8d

arch/s390/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -8,8 +8,8 @@ config MMU 
	default y



config ZONE_DMA

	bool

	default y

	def_bool y

	depends on 64BIT



config LOCKDEP_SUPPORT

	bool

arch/s390/mm/init.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

}