On Tue, 2020-06-09 at 13:45 +0300, Stanimir Varbanov wrote:

Hello,

Here is the third version of dynamic debug improvements in Venus
driver.  As has been suggested on previous version by Joe [1] I've
made the relevant changes in dynamic debug core to handle leveling
as more generic way and not open-code/workaround it in the driver.

About changes:
 - added change in the dynamic_debug and in documentation
 - added respective pr_debug_level and dev_dbg_level

regards,
Stan

[1] https://lkml.org/lkml/2020/5/21/668

This capability is already clumsily used by many
drivers that use a module level "debug" flag.

$ git grep -P "MODULE_PARM.*\bdebug\b"|wc -l
501

That's a _lot_ of homebrewed mechanisms.

Making dynamic debug have this as a feature would
help consolidate and standardize the capability.

ftrace is definitely useful, but not quite as
lightweight and doesn't have the typical uses.