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

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Date:   Mon, 25 Oct 2021 14:38:00 +0800
From:   Quanyang Wang <quanyang.wang@...driver.com>
To:     Linus Walleij <linus.walleij@...aro.org>
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 10/25/21 5:44 AM, Linus Walleij wrote:
> 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.
Done.
https://www.armlinux.org.uk/developer/patches/viewpatch.php?id=9149/1
Thanks for the review.

> 
> Yours,
> Linus Walleij
>