linux-kernel - Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support

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Message-ID: <20161208202013.uutsny6avn5gimwq@pd.tnic>
Date:   Thu, 8 Dec 2016 21:20:13 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support

On Thu, Dec 08, 2016 at 12:08:53PM -0800, Linus Torvalds wrote:
> Especially since that's some of the ugliest inline asm ever due to the
> nasty BX handling.

Yeah, about that: why doesn't gcc handle that for us like it would
handle a clobbered register? I mean, it *should* know that BX is live
when building with -fPIC... The .ifnc thing looks really silly.

Hmmm.

-- 
Regards/Gruss,
    Boris.

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