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

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Date:   Thu, 1 Nov 2018 12:15:54 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Borislav Petkov <bp@...en8.de>,
        Segher Boessenkool <segher@...nel.crashing.org>,
        Ingo Molnar <mingo@...nel.org>,
        Richard Biener <rguenther@...e.de>,
        Michael Matz <matz@...e.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,
        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,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: PROPOSAL: Extend inline asm syntax with size spec

On Thu, Nov 01, 2018 at 02:20:40AM -0700, Joe Perches wrote:
> On Thu, 2018-11-01 at 10:01 +0100, Peter Zijlstra wrote:
> > On Wed, Oct 31, 2018 at 10:20:00PM -0700, Joe Perches wrote:
> > > On Wed, 2018-10-31 at 13:55 +0100, Peter Zijlstra wrote:
> > > > Anyway, with the below patch, I get:
> > > > 
> > > >    text    data     bss     dec     hex filename
> > > > 17385183        5064780 1953892 24403855        1745f8f defconfig-build/vmlinux
> > > > 17385678        5064780 1953892 24404350        174617e defconfig-build/vmlinux
> > > > 
> > > > Which shows we inline more (look for asm_volatile for the actual
> > > > changes).
> > > []
> > > >  scripts/checkpatch.pl                              |  8 ++---
> > > >  scripts/genksyms/keywords.c                        |  4 +--
> > > >  scripts/kernel-doc                                 |  4 +--
> > > 
> > > I believe these should be excluded from the conversions.
> > 
> > Probably, yes. It compiled, which was all I cared about :-)
> > 
> > BTW, if we do that conversion, we should upgrade the checkpatch warn to
> > an error I suppose.
> 
> More like remove altogether as __inline and __inline__
> will no longer be #defined

That's the point, therefore checkpatch should error when it sees them.
Otherwise we'll grow new instances, because it will compile just file.