linux-kernel - Re: [PATCH] powerpc/8xx: use pmd_off() to access a PMD entry in pte

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Date:   Wed, 17 Jun 2020 09:21:42 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>
Cc:     Christophe Leroy <christophe.leroy@....fr>,
        linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH] powerpc/8xx: use pmd_off() to access a PMD entry in pte_update()

Andrew Morton <akpm@...ux-foundation.org> writes:
> On Mon, 15 Jun 2020 12:22:29 +0300 Mike Rapoport <rppt@...nel.org> wrote:
>
>> From: Mike Rapoport <rppt@...ux.ibm.com>
>> 
>> The pte_update() implementation for PPC_8xx unfolds page table from the PGD
>> level to access a PMD entry. Since 8xx has only 2-level page table this can
>> be simplified with pmd_off() shortcut.
>> 
>> Replace explicit unfolding with pmd_off() and drop defines of pgd_index()
>> and pgd_offset() that are no longer needed.
>> 
>> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
>> ---
>> 
>> I think it's powerpc material, but I won't mind if Andrew picks it up :)
>
> Via the powerpc tree would be better, please.

I'll take it into next for v5.9, unless there's a reason it needs to go
into v5.8.

cheers