arm64: mm: Introduce VA_BITS_MIN
In order to support 52-bit kernel addresses detectable at boot time, the kernel needs to know the most conservative VA_BITS possible should it need to fall back to this quantity due to lack of hardware support. A new compile time constant VA_BITS_MIN is introduced in this patch and it is employed in the KASAN end address, KASLR, and EFI stub. For Arm, if 52-bit VA support is unavailable the fallback is to 48-bits. In other words: VA_BITS_MIN = min (48, VA_BITS) Reviewed-by:Catalin Marinas <catalin.marinas@arm.com> Signed-off-by:
Steve Capper <steve.capper@arm.com> Signed-off-by:
Will Deacon <will@kernel.org>
parent
99426e5e
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