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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-05-11 15:39:00 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-05-12 08:36:53 +0100
commitbe20902ba67de70b38c995903321f4152dee57b7 (patch)
tree86f27d4d90b7408d421ce246527431e58a836bf3 /arch/arm/mm/init.c
parent2fb3ec5c9503ba8874e24170de2b40e8f1a58370 (diff)
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>
Diffstat (limited to 'arch/arm/mm/init.c')
-rw-r--r--arch/arm/mm/init.c23
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);
}