linux-kernel - Re: [PATCH 1/3] checkpatch.pl: add missing memory barriers

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Message-ID: <1451945750.4334.111.camel@perches.com>
Date:	Mon, 04 Jan 2016 14:15:50 -0800
From:	Joe Perches <joe@...ches.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	"Cc : 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@...r.kernel.org, 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 1/3] checkpatch.pl: add missing memory barriers

On Mon, 2016-01-04 at 22:45 +0200, Michael S. Tsirkin wrote:
> On Mon, Jan 04, 2016 at 08:07:40AM -0800, Joe Perches wrote:
> > On Mon, 2016-01-04 at 13:36 +0200, Michael S. Tsirkin wrote:
> > > SMP-only barriers were missing in checkpatch.pl
> > > 
> > > Refactor code slightly to make adding more variants easier.
> > > 
> > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > > ---
> > >  scripts/checkpatch.pl | 9 ++++++++-
> > >  1 file changed, 8 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > > index 2b3c228..0245bbe 100755
> > > --- a/scripts/checkpatch.pl
> > > +++ b/scripts/checkpatch.pl
> > > @@ -5116,7 +5116,14 @@ sub process {
> > >  			}
> > >  		}
> > >  # check for memory barriers without a comment.
> > > -		if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
> > > +
> > > +		my @barriers = ('mb', 'rmb', 'wmb', 'read_barrier_depends');
> > > +		my @smp_barriers = ('smp_store_release', 'smp_load_acquire', 'smp_store_mb');
> > > +
> > > +		@smp_barriers = (@smp_barriers, map {"smp_" . $_} @barriers);
> > 
> > I think using map, which so far checkpatch doesn't use,
> > makes smp_barriers harder to understand and it'd be
> > better to enumerate them.
> 
> Okay - I'll rewrite using foreach.
> 

I think using the qr form (like 'our $Attribute' and
a bunch of others) is the general style that should
be used for checkpatch.

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