linux-kernel - Re: [PATCH v2 05/18] x86/fixmap: Generalize the GDT fixmap mechanism

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Message-ID: <CALCETrWZaaxQ88h5ViTWao1T3ZdTcpEPEcuZtxujvX=YQ_ffaA@mail.gmail.com>
Date:   Thu, 23 Nov 2017 07:24:41 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Borislav Petkov <bp@...e.de>
Cc:     Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v2 05/18] x86/fixmap: Generalize the GDT fixmap mechanism

On Wed, Nov 22, 2017 at 9:32 AM, Borislav Petkov <bp@...e.de> wrote:
> On Wed, Nov 22, 2017 at 09:16:00AM -0800, Andy Lutomirski wrote:
>> Agreed, except that the fixmap enum needs to know
>> sizeof(cpu_entry_area), and I'm really hesitant to add yet another
>> header dependency.
>
> Perhaps a separate asm/cpuarea.h. asm/cpu.h looks small enough but it
> has hotplug and other misc stuff in there.
>
> Bah, our header separation needs a serious cleanup. ;-\
>
>> My general habit is that I like the != 0 here because I'm doing
>> arithmetic rather than thinking of % as some kind of logical operator.
>> I.e. I find it easier to understand the way I wrote it.
>
> I know, and I can recognize the code you wrote in arch/x86/ just by
> those tests, without looking at git blame output. :-)
>
> In my case, without the != 0 reads easier.

I'm making the kernel more personal!