linux-kernel - Re: [PATCH 5/5] lib/ioremap: Ensure break-before-make is used for huge p4d mappings

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Message-ID: <5bb8514bd9cb344a6fdcf3fe7e96fcb2ecfd0136.camel@hpe.com>
Date:   Mon, 17 Sep 2018 18:55:26 +0000
From:   "Kani, Toshi" <toshi.kani@....com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "will.deacon@....com" <will.deacon@....com>
CC:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "cpandya@...eaurora.org" <cpandya@...eaurora.org>,
        "Hocko, Michal" <MHocko@...e.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 5/5] lib/ioremap: Ensure break-before-make is used for
 huge p4d mappings

On Wed, 2018-09-12 at 11:26 +0100, Will Deacon wrote:
> Whilst no architectures actually enable support for huge p4d mappings
> in the vmap area, the code that is implemented should be using
> break-before-make, as we do for pud and pmd huge entries.
> 
> Cc: Chintan Pandya <cpandya@...eaurora.org>
> Cc: Toshi Kani <toshi.kani@....com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Will Deacon <will.deacon@....com>

Thanks. This keeps the p4d path consistent.

Reviewed-by: Toshi Kani <toshi.kani@....com>

-Toshi