linux-kernel - Re: [PATCH 18/25] dynamic_debug: Introduce global fake module param $module.dyndbg

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Date:	Fri, 16 Dec 2011 22:10:48 -0700
From:	Jim Cromie <jim.cromie@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	jbaron@...hat.com, greg@...ah.com, linux-kernel@...r.kernel.org,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH 18/25] dynamic_debug: Introduce global fake module param $module.dyndbg

On Thu, Dec 15, 2011 at 5:00 PM, Rusty Russell <rusty@...tcorp.com.au> wrote:
> On Mon, 12 Dec 2011 16:12:44 -0700, jim.cromie@...il.com wrote:
>> From: Jim Cromie <jim.cromie@...il.com>
>>
>> Rework Thomas Renninger's $module.ddebug boot-time debugging feature,
>> from https://lkml.org/lkml/2010/9/15/397
>
> OK, this looks cleaner!
>
> s/modname/doing/ here, since it's a generic callback.
>
> s/modname/doing/ (or /s/modname/unused/).
>
> Same as above.
>
> s/modname/doing/ here too, makes it clear.
>
> ... again....

All done, to be sent shortly.
Thanks


>
>> +/* find & process .dyndbg params (prefixed by modname) in cmdline */
>> +static __init void ddebug_boot_parse_args(void)
>> +{
>
> OK, I don't get why you are doing your own parsing for builtins?
>

After some poking around I didnt want to thrash too much,
and went for Thomas' original approach for builtins.


> Can't you call something from init/main.c:unknown_bootoption()?
>
> If that's too early, I have a patch we're working on which adds
> parameter parsing to each initlevel.
>

It looks too early (unless Ive misunderstood)
dynamic_debug is enabled via arch_initcall

    977 static int __init dynamic_debug_init(void)
    978 {
...
   1018         }
   1019         ddebug_boot_parse_args();
...
   1027 }

   1028 /* Allow early initialization for boot messages via boot param */
   1029 arch_initcall(dynamic_debug_init);
   1030 /* Debugfs setup must be done later */
   1031 module_init(dynamic_debug_init_debugfs);


Do you have a pointer to that patch ?
Is it targetted for v3.3 ?
If so, it sounds like I should aim to use it.

BTW, is this/your desc of arg-processing still accurate/current/complete ?
http://thread.gmane.org/gmane.linux.kernel/767172/focus=767361



> Thanks,
> Rusty.

thank you
Jim Cromie
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