linux-kernel - Re: [PATCH] efi: Fix the size not consistent issue when unmapping memory map

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Message-ID: <20180417003522.GA2741@rfwz>
Date:   Mon, 16 Apr 2018 18:35:22 -0600
From:   Randy Wright <rwright@....com>
To:     joeyli <jlee@...e.com>
Cc:     "Lee, Chun-Yi" <joeyli.kernel@...il.com>,
        linux-efi@...r.kernel.org,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Takashi Iwai <tiwai@...e.de>, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        akpm@...ux-foundation.org, Vivek Goyal <vgoyal@...hat.com>,
        Dave Young <dyoung@...hat.com>
Subject: Re: [PATCH] efi: Fix the size not consistent issue when unmapping
 memory map

On Mon, Apr 16, 2018 at 02:37:38PM +0800, joeyli wrote:
> Hi Randy,
> ...
> Randy, do you want to try Dave's kexec patch on your environment? Please remove
> my patch first.  
> 
> Thanks a lot!
> Joey Lee

Hi Joey, 

I tried Dave's patch to kexec-bzimage64.c on my build of the SuSE
4.12.14-15 kernel.   I ran the same test as I did with your patch: I
verified the early_ioremap.c warnings occurred with a crash triggered
from a kexec boot of the unmodified kernel. Then I applied the patch to
kexec-bzimage64.c, rebuilt, re-ran the test to crash from the kexec'ed
kernel, and verified the warnings are no longer seen.

I'm out of time today, but I will plan to run the same  test tomorrow on
a build of the SuSE 4.4.120-94.17 kernel, on which I had also reported
the original bug.

-- 
Randy Wright            Hewlett Packard Enterprise
Phone: (970) 898-0998   Mail: rwright@....com