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arm64: mm: fix booting on systems with no memory below 4GB
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>
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@ -43,6 +43,8 @@
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#else
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#define STACK_TOP STACK_TOP_MAX
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#endif /* CONFIG_COMPAT */
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#define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK
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#endif /* __KERNEL__ */
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struct debug_info {
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@ -80,7 +80,7 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
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#ifdef CONFIG_ZONE_DMA32
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/* 4GB maximum for 32-bit only capable devices */
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max_dma32 = min(max, MAX_DMA32_PFN);
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zone_size[ZONE_DMA32] = max_dma32 - min;
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zone_size[ZONE_DMA32] = max(min, max_dma32) - min;
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#endif
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zone_size[ZONE_NORMAL] = max - max_dma32;
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