arm64: mm: make vabits_actual a build time constant if possible

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Currently, we only support 52-bit virtual addressing on 64k pages
configurations, and in all other cases, vabits_actual is guaranteed to
equal VA_BITS (== VA_BITS_MIN). So get rid of the variable entirely in
that case.

While at it, move the assignment out of the asm entry code - it has no
need to be there.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20220624150651.1358849-3-ardb@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

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Ard Biesheuvel 2022-06-24 17:06:32 +02:00 • committed by Will Deacon

parent 475031b6ed

commit 0d9b1ffefa

4 changed files with 22 additions and 16 deletions

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4

arch/arm64/include/asm/memory.h

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15

arch/arm64/kernel/head.S

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15

arch/arm64/mm/init.c

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4

arch/arm64/mm/mmu.c

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