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arm64: mm: fix booting on systems with no memory below 4GB

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Booting on a system with all of its memory above the 4GB boundary breaks
for two reasons:

	(1) We still try to create a non-empty DMA32 zone
	(2) no-bootmem limits allocations to 0xffffffff

This patch fixes these issues for ARM64.

Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon 2012-11-08 16:00:16 +00:00 committed by Catalin Marinas
parent b3770b3252
commit f483a853b0
2 changed files with 3 additions and 1 deletions
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2
arch/arm64/include/asm/processor.h
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@ -43,6 +43,8 @@
#else
#define STACK_TOP STACK_TOP_MAX
#endif /* CONFIG_COMPAT */
#define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK
#endif /* __KERNEL__ */
struct debug_info {

2
arch/arm64/mm/init.c
View file

@ -80,7 +80,7 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
#ifdef CONFIG_ZONE_DMA32
/* 4GB maximum for 32-bit only capable devices */
max_dma32 = min(max, MAX_DMA32_PFN);
zone_size[ZONE_DMA32] = max_dma32 - min;
zone_size[ZONE_DMA32] = max(min, max_dma32) - min;
#endif
zone_size[ZONE_NORMAL] = max - max_dma32;