linux-kernel - Re: [ patch 00/21 ] support multiple, pending ddebugs at kernel-boot

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Message-ID: <CAO+b5-pZPsbnpjnFzCQFxWrAtoeG71pn1wVqjcOrR9yBQ3L1nA@mail.gmail.com>
Date:	Tue, 12 Jul 2011 07:53:11 +0200
From:	Bart Van Assche <bvanassche@....org>
To:	Jim Cromie <jim.cromie@...il.com>
Cc:	jbaron@...hat.com, linux-kernel@...r.kernel.org, joe@...ches.com,
	gregkh@...e.de, gnb@...h.org
Subject: Re: [ patch 00/21 ] support multiple, pending ddebugs at kernel-boot

On Mon, Jul 11, 2011 at 9:06 PM, Jim Cromie <jim.cromie@...il.com> wrote:
> On Mon, Jul 11, 2011 at 12:30 PM, Bart Van Assche <bvanassche@....org> wrote:
>> As far as I can see with v2 of this patch set a query gets on the
>> pending list if either +a has been specified or no matches were found
>> the first time a query is run. Are both mechanisms necessary ? If not,
>> I propose to leave out the second. That will not only allow to
>> simplify the code somewhat but will also reduce confusion for
>> dynamic_printk users.
>>
>
> Both conditions are necessary:
> - 'a' flag required,
> - query not directly applicable.
>
> root@...age:~# echo "module nosuch +p" > /dbg/dynamic_debug/control
> root@...age:~# cat /sys/module/dynamic_debug/parameters/pending_ct
> 0
>
> root@...age:~# echo "module nosuch +ap" > /dbg/dynamic_debug/control
> root@...age:~# cat /sys/module/dynamic_debug/parameters/pending_ct
> 1

The above example contradicts the following code added in patch 09/21:

 	/* actually go and implement the change */
 	nfound = ddebug_change(&query, flags, mask);
+
+	pr_info("nfound %d on %s\n", nfound, show_ddebug_query(&query));
+	if (!nfound)
+		return ddebug_save_pending(&query, flags, mask);
+
 	return 0;

Bart.
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