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Date:   Sun, 24 Oct 2021 23:44:31 +0200
From:   Linus Walleij <>
Cc:     Russell King <>,
        Thomas Gleixner <>,
        Ard Biesheuvel <>,
        Linux ARM <>,
        linux-kernel <>
Subject: Re: [PATCH] ARM: add BUILD_BUG_ON to check if fixmap range spans
 multiple pmds

On Wed, Oct 20, 2021 at 7:50 AM <> wrote:

> From: Quanyang Wang <>
> Not only the early fixmap range, but also the fixmap range should be
> checked if it spans multiple pmds. When enabling CONFIG_DEBUG_HIGHMEM,
> some systems which contain up to 16 CPUs will crash.
> Signed-off-by: Quanyang Wang <>

Looks reasonable to me.
Reviewed-by: Linus Walleij <>

Please submit this patch into Russell's patch tracker.

Linus Walleij

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