linux-kernel - Re: [PATCH 1/3] kernel.h: Add DO_ONCE statement expression macro

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Message-Id: <1242954585.3284.7.camel@Joe-Laptop.home>
Date:	Thu, 21 May 2009 18:09:45 -0700
From:	Joe Perches <joe@...ches.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org,
	Dave Jones <davej@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	x86@...nel.org, Len Brown <len.brown@...el.com>,
	Mike Travis <travis@....com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: Re: [PATCH 1/3] kernel.h: Add DO_ONCE statement expression macro

On Fri, 2009-05-22 at 01:27 +0100, Al Viro wrote:
> On Thu, May 21, 2009 at 04:00:22PM -0700, Joe Perches wrote:
> > Add a DO_ONCE statement expression analogous to printk_once
> > that executes any arbitrary statement exactly once.
> > 
> > This will take the place of printk_once so that
> > DO_ONCE(pr_<foo>) or any other statement performed
> > a single time may be easily written.
> 
> Interesting, how telling somebody that they need to learn C is considered
> an unacceptable thing to do.  Hostile to newbies, or some such.  Introducing
> more magic that has to be learnt if one wants to read the kernel source, OTOH,
> is just fine...

I'd be fine if the printk_once macro helper went away.
It was added in commit f036be96dd9ce442ffb9ab33e3c165f5178815c0

If the helper exists though, I think it should work with
all of the pr_<foo> variants.

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