linux-kernel - Re: [RFC][WAS:bcmai][PATCH V2] axi: add AXI bus driver

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Date:	Fri, 08 Apr 2011 17:07:43 -0700
From:	Joe Perches <joe@...ches.com>
To:	Rafał Miłecki <zajec5@...il.com>
Cc:	linux-wireless@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	George Kashperko <george@...u.edu.ua>,
	Arnd Bergmann <arnd@...db.de>,
	Russell King <rmk@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	b43-dev@...ts.infradead.org,
	Michael Büsch <mb@...sch.de>,
	linuxdriverproject <devel@...uxdriverproject.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [RFC][WAS:bcmai][PATCH V2] axi: add AXI bus driver

On Sat, 2011-04-09 at 02:03 +0200, Rafał Miłecki wrote:
> 2011/4/8 Joe Perches <joe@...ches.com>:
> > On Fri, 2011-04-08 at 21:46 +0200, Rafał Miłecki wrote:
> >> 2011/4/8 Joe Perches <joe@...ches.com>:
> >> > On Fri, 2011-04-08 at 21:45 +0200, Rafał Miłecki wrote:
> >> >> diff --git a/include/linux/axi/axi.h b/include/linux/axi/axi.h
> >> > []
> >> >> +#define axi_info     pr_info
> >> >> +#ifdef CONFIG_AXI_DEBUG
> >> >> +#define axi_debug    pr_debug
> >> >> +#else
> >> >> +#define axi_debug    do { } while (0)
> >> >> +#endif
> >> >> +#define axi_err              pr_err
> >> > I think redefining standard functionality like
> >> > this doesn't gain anything and loses some basic
> >> > grep capability.
> >> But on the other hand using:
> >> pr_info, pr_err, BUT axi_debug
> >> can easily lead to mistakes.
> >> Or is this possible to re-define pr_debug locally?
> > It is, but is that CONFIG_AXI_DEBUG actually
> > worthwhile?
> > If you think so, doesn't adding this to the Makefile
> > give you the same capability?
> > ccflags-$(CONFIG_CONFIG_AXI_DEBUG) := -DDEBUG

Just CONFIG_AXI_DEBUG of course.

> But pr_debug does not depend on DEBUG define:
> http://lxr.free-electrons.com/source/tools/perf/util/include/linux/kernel.h#L94
> How do you expect -DDEBUG to affect pr_debug? Could you explain this
> to me, please?

Sure.  You're not looking at the right place.

Look instead at include/linux/printk.h

/* If you are writing a driver, please use dev_dbg instead */
#if defined(DEBUG)
#define pr_debug(fmt, ...) \
	printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#elif defined(CONFIG_DYNAMIC_DEBUG)
/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
#define pr_debug(fmt, ...) \
	dynamic_pr_debug(fmt, ##__VA_ARGS__)
#else
#define pr_debug(fmt, ...) \
	no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#endif

cheers, Joe

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