linux-kernel - Re: [PATCH] x86/kexec: Add ACPI NVS region to the ident map

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Message-ID: <20190610105959.GB5488@zn.tnic>
Date:   Mon, 10 Jun 2019 12:59:59 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Kairui Song <kasong@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Baoquan He <bhe@...hat.com>,
        Junichi Nomura <j-nomura@...jp.nec.com>,
        Dave Young <dyoung@...hat.com>,
        Dirk van der Merwe <dirk.vandermerwe@...ronome.com>,
        Chao Fan <fanc.fnst@...fujitsu.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        kexec@...ts.infradead.org
Subject: Re: [PATCH] x86/kexec: Add ACPI NVS region to the ident map

On Mon, Jun 10, 2019 at 06:18:50PM +0800, Kairui Song wrote:
> Hi Boris, unfortunately I don't have a real machine which only have
> the NVS region. I did fake the memmap to emulate such problem but
> can't really promise this will fix the real case. So just declare it
> won't break anything that is already working. And I'm asking Junichi
> to have a try as he reported this issue on the machines he has.

Yes, this is how you should do it. First you test on a real hardware -
if the issue is such that needs a real hardware to verify - and if it
passes, *then* you send the patch.

If you don't have access to the box, then ask someone who has.

But for the future, please do not send untested patches in a hurry,
hoping that they would work. This could cause more trouble than the
little time you might save speculating it'll all go fine.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.