arm64: mm: check at build time that PAGE_OFFSET divides the VA space evenly

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Commit 8439e62a15 ("arm64: mm: use bit ops rather than arithmetic in
pa/va translations") changed the boundary check against PAGE_OFFSET from
an arithmetic comparison to a bit test. This means we now silently assume
that PAGE_OFFSET is a power of 2 that divides the kernel virtual address
space into two equal halves. So make that assumption explicit.

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

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Ard Biesheuvel 2016-03-02 09:47:13 +01:00 • committed by Catalin Marinas

parent 22b39ca3f2

commit 6d2aa549de

1 changed files with 7 additions and 0 deletions

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arch/arm64/mm/init.c

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