linux-kernel - Re: [PATCH v3 0/7] Venus dynamic debug

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Date:   Tue, 09 Jun 2020 09:40:26 -0700
From:   Joe Perches <joe@...ches.com>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-acpi@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Baron <jbaron@...mai.com>
Subject: Re: [PATCH v3 0/7] Venus dynamic debug

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.