linux-kernel - Re: [PATCH v5 4/4] x86/mm/KASLR: Adjust the padding size for the direct mapping.

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Message-ID: <20191214071529.GB28635@zn.tnic>
Date:   Sat, 14 Dec 2019 08:15:29 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Baoquan He <bhe@...hat.com>
Cc:     Masayoshi Mizuma <msys.mizuma@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/4] x86/mm/KASLR: Adjust the padding size for the
 direct mapping.

On Sat, Dec 14, 2019 at 11:33:48AM +0800, Baoquan He wrote:
> So in kernel there's no way to check if memory hotplug is supported in
> system.

Which makes it even worse. We will carry this bunch of code which would
be dead code on most systems. Do you understand now why I'm pushing back
on this to be designed as clean and as lean as possible?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette