linux-kernel - Re: [PATCH 2/2] implement new notifier function to panic_notifier

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Date:	Thu, 4 Oct 2007 09:07:11 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Takenori Nagano <t-nagano@...jp.nec.com>
Cc:	linux-kernel@...r.kernel.org, vgoyal@...ibm.com,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	k-miyoshi@...jp.nec.com, kexec@...ts.infradead.org,
	Bernhard Walle <bwalle@...e.de>, Keith Owens <kaos@....com.au>,
	Andrew Morton <akpm@...ux-foundation.org>, kdb@....sgi.com
Subject: Re: [PATCH 2/2] implement new notifier function to
 panic_notifier_list

On Thu, 04 Oct 2007 20:38:50 +0900 Takenori Nagano wrote:

> This patch implements new notifier function to panic_notifier_list. We can
> change the list of order by debugfs.
> 
> Thanks,
> 
> ---
> 
> Signed-off-by: Takenori Nagano <t-nagano@...jp.nec.com>
> 
> ---

...

> diff -uprN linux-2.6.23-rc9.orig/kernel/softlockup.c
> linux-2.6.23-rc9/kernel/softlockup.c
> --- linux-2.6.23-rc9.orig/kernel/softlockup.c	2007-10-02 12:24:52.000000000 +0900
> +++ linux-2.6.23-rc9/kernel/softlockup.c	2007-10-04 09:46:25.784000000 +0900
> @@ -31,10 +31,18 @@ softlock_panic(struct notifier_block *th
>  	return NOTIFY_DONE;
>  }
> 
> -static struct notifier_block panic_block = {
> +static struct notifier_block panic_block_base = {
>  	.notifier_call = softlock_panic,
>  };
> 
> +static struct tunable_notifier_block panic_block = {
> +	.nb		= &panic_block_base,
> +	.head		= NULL,
> +	.dir		= NULL,
> +	.pri_dentry	= NULL,
> +	.desc_dentry	= NULL
> +};
> +
>  /*
>   * Returns seconds, approximately.  We don't need nanosecond
>   * resolution, and we don't need to waste time with a big divide when
> @@ -193,5 +201,6 @@ __init void spawn_softlockup_task(void)
>  	cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
>  	register_cpu_notifier(&cpu_nfb);
> 
> -	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
> +	tunable_notifier_chain_register(&panic_notifier_list, &panic_block,
> +						"softlookup", NULL);
>  }

                                                "softlockup"

---
~Randy
-
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