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Commit f483a853 authored by Will Deacon's avatar Will Deacon Committed by Catalin Marinas
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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: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent b3770b32

arch/arm64/include/asm/processor.h

+2 −0
Original line number Diff line number Diff line
@@ -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 {

arch/arm64/mm/init.c

+1 −1
Original line number Diff line number Diff line
@@ -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;