Re: [PATCH v3 11/34] mips: mm: Add p?d_large() definitions

[Paul Burton]

Hi Steven,

On Wed, Feb 27, 2019 at 05:05:45PM +0000, Steven Price wrote:
> For mips, we don't support large pages on 32 bit so add stubs returning 0.

So far so good :)

> For 64 bit look for _PAGE_HUGE flag being set. This means exposing the
> flag when !CONFIG_MIPS_HUGE_TLB_SUPPORT.

Here I have to ask why? We could just return 0 like the mips32 case when
CONFIG_MIPS_HUGE_TLB_SUPPORT=n, let the compiler optimize the whole
thing out and avoid redundant work at runtime.

This could be unified too in asm/pgtable.h - checking for
CONFIG_MIPS_HUGE_TLB_SUPPORT should be sufficient to cover the mips32
case along with the subset of mips64 configurations without huge pages.

Thanks,
    Paul