linux-kernel - Re: [PATCHv4 3/4] x86/boot/compressed/64: Introduce place

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Message-ID: <20171207081659.GC2739@bombadil.infradead.org>
Date:   Thu, 7 Dec 2017 00:17:00 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Borislav Petkov <bp@...e.de>, Andi Kleen <ak@...ux.intel.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 3/4] x86/boot/compressed/64: Introduce
 place_trampoline()

On Thu, Dec 07, 2017 at 07:30:48AM +0100, Ingo Molnar wrote:
> > But if the bootloader put the kernel above 4G (not sure if anybody does
> > this), we would loose control as soon as paging is disabled as code
> > becomes unreachable.
> 
> Yeah, so instead of the double 'as' which is syntactically right but a bit 
> confusing to read, how about something like:
> 
>   But if the bootloader put the kernel above 4G (not sure if anybody does
>   this), we would loose control as soon as paging is disabled, because the
>   code becomes unreachable to the CPU.

btw, it's "lose control".