linux-kernel - Re: [PATCH 3/4] SunRPC: Use no_printk() for the null dprintk() and dfprintk()

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Date:	Thu, 26 Sep 2013 08:38:08 -0700
From:	Joe Perches <joe@...ches.com>
To:	David Howells <dhowells@...hat.com>
Cc:	bfields@...ldses.org, Trond.Myklebust@...app.com, olof@...om.net,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] SunRPC: Use no_printk() for the null dprintk() and
 dfprintk()

On Thu, 2013-09-26 at 16:35 +0100, David Howells wrote:
> Joe Perches <joe@...ches.com> wrote:
> 
> > no_printk doesn't prevent any argument side-effects
> > from being optimized away by the compiler.
> > 
> > ie:
> > 	dprintk("%d", func())
> > func is now always called when before it wasn't.
> 
> Yes, I know.  There are half a dozen places where this is the case.  Those
> I've wrapped in ifdebug(FACILITY) { ... } in the code.  It's not the nicest,
> but at least the compiler always gets to see everything, rather than bits of
> it getting hidden by the preprocessor - which means the call points will be
> less likely to bit rot over time.

No code is eliminated by the preprocessor
with the #define I suggest.


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