On Mon, Jul 29, 2019 at 05:21:11PM +0100, Steve Capper wrote:

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)

Signed-off-by: Steve Capper <redacted>

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>

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