On Wed, Dec 05, 2018 at 04:41:45PM +0000, Steve Capper wrote:

On arm64 52-bit VAs are provided to userspace when a hint is supplied to
mmap. This helps maintain compatibility with software that expects at
most 48-bit VAs to be returned.

In order to help identify software that has 48-bit VA assumptions, this
patch allows one to compile a kernel where 52-bit VAs are returned by
default on HW that supports it.

This feature is intended to be for development systems only.

Signed-off-by: Steve Capper <redacted>

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

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