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

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Message-ID: <20181008100245.GP29268@gate.crashing.org>
Date:   Mon, 8 Oct 2018 05:02:46 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Richard Biener <rguenther@...e.de>
Cc:     Michael Matz <matz@...e.de>, Borislav Petkov <bp@...en8.de>,
        gcc@....gnu.org, Nadav Amit <namit@...are.com>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Alok Kataria <akataria@...are.com>,
        Christopher Li <sparse@...isli.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>, 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 <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 Mon, Oct 08, 2018 at 11:07:46AM +0200, Richard Biener wrote:
> > All of a targets register names and alternative register names are
> > allowed in the clobber list.  Will that never conflict with an attribute
> > name?  We already *have* syntax for specifying attributes on an asm (on
> > *any* statement even), so mixing these two things has no advantage.
> 
> Heh, but I failed to make an example with attribute synatx working.
> IIRC attributes do not work on stmts.  What could work is to use
> a #pragma though.

Apparently statement attributes currently(?) only work for null statements.
Oh well.


Segher