linux-kernel - Re: [PATCH] ARM: add BUILD_BUG_ON to check if fixmap range spans multiple pmds

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Message-ID: <CACRpkdYxMDp4FRGP=EOt8oTMxs_YuskbvMx5wXBDjUWz6hD=gQ@mail.gmail.com>
Date:   Sun, 24 Oct 2021 23:44:31 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     quanyang.wang@...driver.com
Cc:     Russell King <linux@...linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
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 <quanyang.wang@...driver.com> wrote:

> From: Quanyang Wang <quanyang.wang@...driver.com>
>
> 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 <quanyang.wang@...driver.com>

Looks reasonable to me.
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Please submit this patch into Russell's patch tracker.

Yours,
Linus Walleij