linux-kernel - Re: Boot-time dynamic debugging?

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Date:	Fri, 6 Aug 2010 16:03:53 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Jason Baron <jbaron@...hat.com>, Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, bjorn.helgaas@...com
Subject: Re: Boot-time dynamic debugging?

On Monday 02 August 2010 16:13:59 Thomas Renninger wrote:
> On Monday 02 August 2010 15:53:24 Pekka Enberg wrote:
...
> > Btw, can you easily enable all dev_dbg() calls with the boot parameter?
> I expect yes, but never explicitly tried it, dev_dbg should result in
> printk(KERN_DEBUG ...) after some macro/inline func processing.
My statement was wrong, from what I can see having a closer look:
printk(KERN_DEBUG...) messages will not show up, but dev_dbg will:
----------
asmlinkage int printk(const char * fmt, ...)
        __attribute__ ((format (printf, 1, 2))) __cold;
static inline int printk(const char *s, ...)
        __attribute__ ((format (printf, 1, 2)));
----------
I wonder whether the KERN_DEBUG can be differed at compile time
and could also result in a dynamic_pr_debug...

----------
#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__)

#elif defined(CONFIG_DYNAMIC_DEBUG)
#define dev_dbg(dev, format, ...)                    \
do {                                                 \
        dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
}
----------

      Thomas
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