[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: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
SchmErik · Feb 21, 2007 · 118bcd3 · 118bcd3
1 parent 63db6e8
commit 118bcd3
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
@@ -8,8 +8,8 @@ config MMU
 	default y
 
 config ZONE_DMA
-	bool
-	default y
+	def_bool y
+	depends on 64BIT
 
 config LOCKDEP_SUPPORT
 	bool

diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
@@ -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);
 }