Re: [PATCH V2 1/3] efi: arch, x86: arch, ia64: move efi_mem_attributes()

[Matt Fleming <matt@codeblueprint.co.uk>]

On Tue, 02 Jun, at 05:09:14PM, Zhang, Jonathan Zhixiong wrote:
> Thank you for the feedback, Matt.
> 
> Given that IA64 does not set EFI_MEMMAP, it appears to me there
> are following options:
> A. Keep status quota and copy x86's efi_mem_attributes() code
> to arm64.

Let's avoid this option.

> B. In efi subsystem, provide week default efi_mem_attributes().
> In the mean time, IA64 continues to have its own implementation.

While I'm not a huge fan of using __weak this makes the most sense to me
because the alternative is to rename either the ia64 or x86
implementation and that just seems silly.

> C. Add EFI_MEMMAP support (and related bits) in IA64.

C. isn't an option because the ia64 memory map doesn't work the same way
as x86 and arm64.
 
> Which option do you prefer? Once there is a consensus, I am
> willing to submit patch accordingly for review.

Let's go with B. but please provide a comment above the weak
implementation explaining *why* it's declared as weak and that any new
architecture probably doesn't want to override it. Explain that the ia64
EFI memory map is special.

-- 
Matt Fleming, Intel Open Source Technology Center