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: <1437440779.28284.7.camel@perches.com>
Date:	Mon, 20 Jul 2015 18:06:19 -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 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.

Regardless, it's not as capable as it wouldn't find
any miswritten form like

	synchronize_<foo>_expedited ( args... )

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