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dev_vdbg(), available with -DVERBOSE_DEBUG

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This defines a dev_vdbg() call, which is enabled with -DVERBOSE_DEBUG.
When enabled, dev_vdbg() acts just like dev_dbg().  When disabled, it is a
NOP ...  just like dev_dbg() without -DDEBUG.  The specific code was moved
out of a USB patch, but lots of drivers have similar support.

That is, code can now be written to use an additional level of debug
output, selected at compile time.  Many driver authors have found this
idiom to be very useful.  A typical usage model is for "normal" debug
messages to focus on fault paths and not be very "chatty", so that those
messages can be left on during normal operation without much of a
performance or syslog load.  On the other hand "verbose" messages would be
noisy enough that they wouldn't normally be enabled; they might even affect
timings enough to change system or driver behavior.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell 2007-07-12 22:08:22 -07:00 committed by Greg Kroah-Hartman
parent bc37e28303
commit aebdc3b450
2 changed files with 10 additions and 7 deletions
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7
drivers/usb/core/driver.c
View File

@ -29,13 +29,6 @@
#include "hcd.h"
#include "usb.h"
#define VERBOSE_DEBUG 0
#if VERBOSE_DEBUG
#define dev_vdbg dev_dbg
#else
#define dev_vdbg(dev, fmt, args...) do { } while (0)
#endif
#ifdef CONFIG_HOTPLUG

10
include/linux/device.h
View File

@ -572,6 +572,16 @@ dev_dbg(struct device * dev, const char * fmt, ...)
}
#endif
#ifdef VERBOSE_DEBUG
#define dev_vdbg dev_dbg
#else
static inline int __attribute__ ((format (printf, 2, 3)))
dev_vdbg(struct device * dev, const char * fmt, ...)
{
return 0;
}
#endif
#define dev_err(dev, format, arg...) \
dev_printk(KERN_ERR , dev , format , ## arg)
#define dev_info(dev, format, arg...) \