From: David Brownell Date: Fri, 13 Jul 2007 05:08:22 +0000 (-0700) Subject: dev_vdbg(), available with -DVERBOSE_DEBUG X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=aebdc3b450a3febf7d7d00cd2235509055ec7082;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git dev_vdbg(), available with -DVERBOSE_DEBUG 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 Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 73c49362cd47..654857493a82 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -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 diff --git a/include/linux/device.h b/include/linux/device.h index be2debed70d2..d9f0a57f5a2f 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -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...) \