Commit e9eaa805 authored Jan 18, 2018 by Kristina Martsenko Committed by Catalin Marinas Jan 19, 2018

arm64: mm: ignore memory above supported physical address size



When booting a kernel without 52-bit PA support (e.g. a kernel with 4k
pages) on a system with 52-bit memory, the kernel will currently try to
use the 52-bit memory and crash. Fix this by ignoring any memory higher
than what the kernel supports.

Fixes: f77d2817 ("arm64: enable 52-bit physical address support")
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

parent 6b88a32c

arch/arm64/mm/init.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -366,6 +366,9 @@ void __init arm64_memblock_init(void)
		/* Handle linux,usable-memory-range property */
		fdt_enforce_memory_region();

		/* Remove memory above our supported physical address size */
		memblock_remove(1ULL << PHYS_MASK_SHIFT, ULLONG_MAX);

		/*
		* Ensure that the linear region takes up exactly half of the kernel
		* virtual address space. This way, we can distinguish a linear address

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