On Wed, Aug 14, 2013 at 10:04:10AM -0700, Greg KH wrote: > On Wed, Aug 14, 2013 at 09:51:54AM -0700, Joe Perches wrote: > > On Wed, 2013-08-14 at 09:40 -0700, Sarah Sharp wrote: > > > Hi Xenia, > > > > > > I'm a bit confused. I thought that debugging messages would be turned > > > off by default for a module if CONFIG_DYNAMIC_DEBUG was turned on. When > > > I tested your patch to remove the CONFIG_USB_XHCI_HCD_DEBUGGING and just > > > use dev_dbg, the messages from the xHCI driver appeared in dmesg by > > > default. > > > > > > That generates a lot of log spew. We can have distros add a boot > > > parameter option to turn off debug messages, but that boot parameter is > > > limited to 1023 characters. I'm concerned that if more drivers add > > > dynamic debugging, the distros will eventually run out of space in the > > > dynamic debugging boot parameter. I know Greg was ripping out debugging > > > config options in other USB drivers, so this is a bit concerning. > > > > > > Jason, is there a way within the xHCI driver to say that dynamic > > > debugging should be off by default? I've looked through the > > > documentation, and I can't find anything like that documented. > > > > #undefine DEBUG > > > > > I've attached my .config file, in case I have something misconfigured. > > > > Because of: > > > > drivers/usb/host/Makefile:ccflags-$(CONFIG_USB_DEBUG) := -DDEBUG > > Yes, that's the problem, I'm trying to get rid of the CONFIG_USB_DEBUG > flag, and I'm almost there. There are some host controllers that still > use it for some things that I have not cleaned up fully yet.
Do you think those patches will land in 3.12? If not, I'll add an #undefine DEBUG to xhci.h to avoid the log spew. Sarah Sharp -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
