linux-kernel - Re: PROPOSAL: Extend inline asm syntax with size spec

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Message-ID: <alpine.LSU.2.20.1811291408400.1827@zhemvz.fhfr.qr>
Date:   Thu, 29 Nov 2018 14:09:25 +0100 (CET)
From:   Richard Biener <rguenther@...e.de>
To:     Borislav Petkov <bp@...en8.de>
cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Segher Boessenkool <segher@...nel.crashing.org>,
        Nadav Amit <namit@...are.com>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, matz@...e.de, gcc@....gnu.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        X86 ML <x86@...nel.org>, Sam Ravnborg <sam@...nborg.org>,
        Alok Kataria <akataria@...are.com>,
        Christopher Li <sparse@...isli.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jan Beulich <JBeulich@...e.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        linux-sparse@...r.kernel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        virtualization@...ts.linux-foundation.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        linux-xtensa@...ux-xtensa.org
Subject: Re: PROPOSAL: Extend inline asm syntax with size spec

On Thu, 29 Nov 2018, Borislav Petkov wrote:

> On Thu, Nov 29, 2018 at 08:46:34PM +0900, Masahiro Yamada wrote:
> > But, I'd like to ask if x86 people want to keep this macros.s approach.
> > Revert 77b0bf55bc675 right now
> > assuming the compiler will eventually solve the issue?
> 
> Yap, considering how elegant the compiler solution is and how much
> problems this macros-in-asm thing causes, I think we should patch
> out the latter and wait for gcc9. I mean, the savings are not so
> mind-blowing to have to deal with the fallout.
> 
> But this is just my opinion.

I'd be not opposed to backporting the asm inline support.

Of course we still have to be happy with it and install the patch ;)

Are you (kernel folks) happy with asm inline ()?

Richard.

> Thx.
> 
> 

-- 
Richard Biener <rguenther@...e.de>
SUSE LINUX GmbH, GF: Felix Imendoerffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nuernberg)