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Date: Fri, 13 Jul 2007 00:00:16 -0700 From: David Brownell <david-b@...bell.net> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Linux Kernel list <linux-kernel@...r.kernel.org>, Greg KH <greg@...ah.com>, Alan Stern <stern@...land.harvard.edu> Subject: Re: [patch 2.6.22-git] dev_vdbg(), available with -DVERBOSE_DEBUG On Thursday 12 July 2007, Andrew Morton wrote: > On Thu, 12 Jul 2007 20:30:49 -0700 David Brownell <david-b@...bell.net> wrote: > > > 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. > > I suppose we should find some way of telling people about this. Maybe > in the `make help' output? Whereever people learn about "-DDEBUG", they should probably be able to learn about "-DVERBOSE_DEBUG". Which is likely from existing kernel code (although most C coders will expect that "-DDEBUG" does *something* interesting). I suspect maybe Documentation/CodingStyle would be better.. - Dave ==== CUT HERE Update CodingStyle to talk about "-DDEBUG" message conventions and the new "-DVERBOSE_DEBUG" convention. Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net> --- Documentation/CodingStyle | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) --- g26.orig/Documentation/CodingStyle 2007-07-12 23:03:25.000000000 -0700 +++ g26/Documentation/CodingStyle 2007-07-12 23:53:52.000000000 -0700 @@ -621,12 +621,27 @@ covers RTL which is used frequently with Kernel developers like to be seen as literate. Do mind the spelling of kernel messages to make a good impression. Do not use crippled -words like "dont" and use "do not" or "don't" instead. +words like "dont"; use "do not" or "don't" instead. Make the messages +concise, clear, and unambiguous. Kernel messages do not have to be terminated with a period. Printing numbers in parentheses (%d) adds no value and should be avoided. +There are a number of driver model diagnostic macros in <linux/device.h> +which you should use to make sure messages are matched to the right device +and driver, and are tagged with the right level: dev_err(), dev_warn(), +dev_info(), and so forth. For messages that aren't associated with a +particular device, <linux/kernel.h> defines pr_debug() and pr_info(). + +Coming up with good debugging messages can be quite a challenge; and once +you have them, they can be a huge help for remote troubleshooting. Such +messages should be compiled out when the DEBUG symbol is not defined (that +is, by default they are not included). When you use dev_dbg() or pr_debug(), +that's automatic. Many subsystems have Kconfig options to turn on -DDEBUG. +A related convention uses VERBOSE_DEBUG to add dev_vdbg() messages to the +ones already enabled by DEBUG. + Chapter 14: Allocating memory @@ -751,4 +766,5 @@ Kernel CodingStyle, by greg@...ah.com at http://www.kroah.com/linux/talks/ols_2002_kernel_codingstyle_talk/html/ -- -Last updated on 2006-December-06. +Last updated on 2007-July-13. + - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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