linux-kernel - Re: [PATCH v3 3/3] checkpatch: add virt barriers

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Date:	Mon, 11 Jan 2016 12:56:35 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Julian Calaby <julian.calaby@...il.com>
Cc:	Joe Perches <joe@...ches.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Whitcroft <apw@...onical.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	virtualization@...ts.linux-foundation.org,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	David Miller <davem@...emloft.net>, linux-ia64@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	sparclinux <sparclinux@...r.kernel.org>,
	"Mailing List, Arm" <linux-arm-kernel@...ts.infradead.org>,
	linux-metag@...r.kernel.org, linux-mips@...ux-mips.org,
	x86@...nel.org, user-mode-linux-devel@...ts.sourceforge.net,
	adi-buildroot-devel@...ts.sourceforge.net,
	linux-sh@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	xen-devel@...ts.xenproject.org, Ingo Molnar <mingo@...nel.org>,
	Tony Lindgren <tony@...mide.com>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH v3 3/3] checkpatch: add virt barriers

On Mon, Jan 11, 2016 at 09:40:18PM +1100, Julian Calaby wrote:
> Hi Michael,
> 
> On Mon, Jan 11, 2016 at 9:35 PM, Michael S. Tsirkin <mst@...hat.com> wrote:
> > On Sun, Jan 10, 2016 at 02:52:16PM -0800, Joe Perches wrote:
> >> On Mon, 2016-01-11 at 09:13 +1100, Julian Calaby wrote:
> >> > On Mon, Jan 11, 2016 at 6:31 AM, Michael S. Tsirkin <mst@...hat.com> wrote:
> >> > > Add virt_ barriers to list of barriers to check for
> >> > > presence of a comment.
> >> []
> >> > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> >> []
> >> > > @@ -5133,7 +5133,8 @@ sub process {
> >> > >                 }x;
> >> > >                 my $all_barriers = qr{
> >> > >                         $barriers|
> >> > > -                       smp_(?:$smp_barrier_stems)
> >> > > +                       smp_(?:$smp_barrier_stems)|
> >> > > +                       virt_(?:$smp_barrier_stems)
> >> >
> >> > Sorry I'm late to the party here, but would it make sense to write this as:
> >> >
> >> > (?:smp|virt)_(?:$smp_barrier_stems)
> >>
> >> Yes.  Perhaps the name might be better as barrier_stems.
> >>
> >> Also, ideally this would be longest match first or use \b
> >> after the matches so that $all_barriers could work
> >> successfully without a following \s*\(
> >>
> >> my $all_barriers = qr{
> >>       (?:smp|virt)_(?:barrier_stems)|
> >>       $barriers)
> >> }x;
> >>
> >> or maybe add separate $smp_barriers and $virt_barriers
> >>
> >> <shrug>  it doesn't matter much in any case
> >
> > OK just to clarify - are you OK with merging the patch as is?
> > Refactorings can come as patches on top if required.
> 
> I don't really care either way, I was just asking if it was possible.
> If you don't see any value in that change, then don't make it.
> 
> Thanks,
> 
> -- 
> Julian Calaby
> 
> Email: julian.calaby@...il.com
> Profile: http://www.google.com/profiles/julian.calaby/

OK, got it, thanks.

I will rename smp_barrier_stems to barrier_stems since
this doesn't need too much testing.

I'd rather keep the regex code as is since changing it requires
testing.  I might play with it some more in the future
but I'd like to merge it in the current form to help make
sure __smp barriers are not misused.

I'll post v4 now - an ack will be appreciated.
-- 
MST