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-rw-r--r--arch/s390/Kconfig4
-rw-r--r--arch/s390/mm/init.c2
2 files changed, 4 insertions, 2 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index eaaac378811..d9425f59be9 100644
--- 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
index b3e7c45efb6..916b72a8cde 100644
--- 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);
}