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From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Andrew Morton <akpm@linux-foundation.org>,
        Mike Rapoport <rppt@kernel.org>
Cc:     Christophe Leroy <christophe.leroy@c-s.fr>,
        linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Mike Rapoport <rppt@linux.ibm.com>
Subject: Re: [PATCH] powerpc/8xx: use pmd_off() to access a PMD entry in pte_update()
In-Reply-To: <20200616124304.bbe36933fcd48c5f467f4be9@linux-foundation.org>
References: <20200615092229.23142-1-rppt@kernel.org> <20200616124304.bbe36933fcd48c5f467f4be9@linux-foundation.org>
Date:   Wed, 17 Jun 2020 09:21:42 +1000
Message-ID: <87o8piegvt.fsf@mpe.ellerman.id.au>
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Andrew Morton <akpm@linux-foundation.org> writes:
> On Mon, 15 Jun 2020 12:22:29 +0300 Mike Rapoport <rppt@kernel.org> wrote:
>
>> From: Mike Rapoport <rppt@linux.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@linux.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