Re: [PATCH 11/16] x86: add a boot option to enable and disable the direct map

[Wei Liu <wl@xxxxxxx>]

On Thu, Apr 30, 2020 at 09:44:20PM +0100, Hongyan Xia wrote:
> From: Hongyan Xia <hongyxia@xxxxxxxxxx>
> 
> Also add a helper function to retrieve it. Change arch_mfn_in_direct_map
> to check this option before returning.
> 
> This is added as a boot command line option, not a Kconfig. We do not
> produce different builds for EC2 so this is not introduced as a
> compile-time configuration.

Having a Kconfig will probably allow the compiler to eliminate dead
code.

This is not asking you to do the work, someone can come along and adjust 
arch_has_directmap easily.

Wei.