linux-kernel - Re: [PATCH tip/core/rcu 15/16] scripts: Make checkpatch.pl warn on expedited RCU grace periods

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Message-ID: <1437499086.28284.58.camel@perches.com>
Date:	Tue, 21 Jul 2015 10:18:06 -0700
From:	Joe Perches <joe@...ches.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com,
	Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH tip/core/rcu 15/16] scripts: Make checkpatch.pl warn on
 expedited RCU grace periods

On Mon, 2015-07-20 at 21:15 -0400, Steven Rostedt wrote:
> On Mon, 20 Jul 2015 18:06:19 -0700 Joe Perches <joe@...ches.com> wrote:
> > On Mon, 2015-07-20 at 20:55 -0400, Steven Rostedt wrote:
> > > On Fri, 17 Jul 2015 15:37:54 -0700
> > > Joe Perches <joe@...ches.com> wrote:
> > > > > +		if ($line =~ /\b(synchronize_rcu_expedited|synchronize_sched_expedited)\(/) {
> > > > It'd be faster perl without capture groups:
> > > Is checkpatch such a critical code path that we could possibly notice
> > > the difference in speed? Although the above may be few microseconds
> > > slower, to me, the above looks a hell of a lot more readable.

Not to me. Compact is generally more readable.

> > Regardless, it's not as capable as it wouldn't find
> > any miswritten form like
> > 
> > 	synchronize_<foo>_expedited ( args... )
> 
> Then that's a better rational than performance.

Part and parcel.

Regardless, I'll send a patch once it's actually pushed.

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