ARM: use ARM_DMA_ZONE_SIZE to adjust the zone sizes

Rather than each platform providing its own function to adjust the
zone sizes, use the new ARM_DMA_ZONE_SIZE definition to perform this
adjustment.  This ensures that the actual DMA zone size and the
ISA_DMA_THRESHOLD/MAX_DMA_ADDRESS definitions are consistent with
each other, and moves this complexity out of the platform code.

Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 22 insertions, 1 deletions

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index e5f6fc428348..49eaad9136a7 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -201,6 +201,20 @@ static void __init arm_bootmem_init(unsigned long start_pfn,
         }
 }
 
+#ifdef CONFIG_ZONE_DMA
+static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
+        unsigned long dma_size)
+{
+        if (size[0] <= dma_size)
+                return;
+
+        size[ZONE_NORMAL] = size[0] - dma_size;
+        size[ZONE_DMA] = dma_size;
+        hole[ZONE_NORMAL] = hole[0];
+        hole[ZONE_DMA] = 0;
+}
+#endif
+
 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
         unsigned long max_high)
 {
@@ -243,11 +257,18 @@ static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 #endif
         }
 
+#ifdef ARM_DMA_ZONE_SIZE
+#ifndef CONFIG_ZONE_DMA
+#error ARM_DMA_ZONE_SIZE set but no DMA zone to limit allocations
+#endif
+
         /*
          * Adjust the sizes according to any special requirements for
          * this machine type.
          */
-        arch_adjust_zones(zone_size, zhole_size);
+        arm_adjust_dma_zone(zone_size, zhole_size,
+                ARM_DMA_ZONE_SIZE >> PAGE_SHIFT);
+#endif
 
         free_area_init_node(0, zone_size, min, zhole_size);
 }