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

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Date:   Tue, 16 Jun 2020 12:43:04 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        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()

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.