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Re: [PATCH 2/2] implement new notifier function to panic_notifier_list

To: vgoyal@xxxxxxxxxx
Subject: Re: [PATCH 2/2] implement new notifier function to panic_notifier_list
From: Takenori Nagano <t-nagano@xxxxxxxxxxxxx>
Date: Fri, 05 Oct 2007 15:19:42 +0900
Cc: linux-kernel@xxxxxxxxxxxxxxx, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, k-miyoshi@xxxxxxxxxxxxx, kexec@xxxxxxxxxxxxxxxxxxx, Bernhard Walle <bwalle@xxxxxxx>, Keith Owens <kaos@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, kdb@xxxxxxxxxxx
In-reply-to: <20071005054952.GC4893@xxxxxxxxxx>
References: <4704D0CA.4080001@xxxxxxxxxxxxx> <20071005054952.GC4893@xxxxxxxxxx>
Sender: kdb-bounce@xxxxxxxxxxx
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Vivek Goyal wrote:
> On Thu, Oct 04, 2007 at 08:38:50PM +0900, Takenori Nagano wrote:
>
>> @@ -522,8 +530,8 @@ setup_arch(char **cmdline_p)
>>      }
>>
>>      /* Register a call for panic conditions. */
>> -    atomic_notifier_chain_register(&panic_notifier_list,
>> -                    &alpha_panic_block);
>> +    tunable_notifier_chain_register(&panic_notifier_list,
>> +                    &alpha_panic_block, "alpha_panic", NULL);
>>
> 
> I think it might be good idea to somehow create provisions for another a
> help string. This help string will inform admin that what a registered
> user does? Ideally this should be visible in /sys/kernel/debug/<user 
> module>/description file.

Hi Vivek,

We can make description file with tunable_notifier_chain_register 4th argument.
If developer sets 4th argument, tunable_notifier_chain_register makes
/sys/kernel/debug/<name>/description file. Admin can get information from the
description file.

+/**
+ *     tunable_notifier_chain_register - Add notifier to an tunable notifier 
chain
+ *     @nh: Pointer to head of the tunable notifier chain
+ *     @n: New entry in notifier chain
+ *     @name: Pointer to the name of the new notifier entry
+ *     @desc: Pointer to the description of new entry
+ *
+ *     Adds a notifier to an tunable notifier chain and makes control dir.
+ *
+ *     Returns zero on success or %-ENODEV on failure.
+ */

Thanks,

Takenori Nagano <t-nagano@xxxxxxxxxxxxx>
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