arm64: mm: treat memstart_addr as a signed quantity

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Commit c031a4213c ("arm64: kaslr: randomize the linear region")
implements randomization of the linear region, by subtracting a random
multiple of PUD_SIZE from memstart_addr. This causes the virtual mapping
of system RAM to move upwards in the linear region, and at the same time
causes memstart_addr to assume a value which may be negative if the offset
of system RAM in the physical space is smaller than its offset relative to
PAGE_OFFSET in the virtual space.

Since memstart_addr is effectively an offset now, redefine its type as s64
so that expressions involving shifting or division preserve its sign.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Ard Biesheuvel 2016-02-26 17:57:14 +01:00 • committed by Catalin Marinas

parent a6e1f7273b

commit 020d044f66

2 changed files with 3 additions and 3 deletions

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2

arch/arm64/include/asm/memory.h

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4

arch/arm64/mm/init.c

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