linux-kernel - Re: [RFC][PATCH -mm] replace cad

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Date:	Wed, 20 Sep 2006 14:30:28 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Cedric Le Goater <clg@...ibm.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [RFC][PATCH -mm] replace cad_pid by a struct pid

On Wed, 20 Sep 2006 11:38:35 +0200
Cedric Le Goater <clg@...ibm.com> wrote:

> There are a few places in the kernel where the init task is
> signaled. The ctrl+alt+del sequence is one them. It kills a task,
> usually init, using a cached pid (cad_pid).
> 
> This patch replaces the pid_t by a struct pid to avoid pid wrap around
> problem. The struct pid is initialized at boot time in init() and can
> be modified through systctl with
> 
> 	/proc/sys/kernel/cad_pid

hm.  Is there any sane scenario in which C-A-D would be directed to any
other process?

What happens if/when the process which is identifier by
/proc/sys/kernel/cad_pid exits?  User error, I guess...

> +extern struct pid* cad_pid;

Whitespace violation detected!

> -	if (shuting_down || kill_proc(1, SIGINT, 1)) {
> +	if (shuting_down || kill_cad_pid(SIGINT, 1)) {

So your patch actually makes functional changes: lots of random
init-signallers gain extra functionality: the process which they signal can
now be configured via /proc/sys/kernel/cad_pid.  But by default, things
remain unchanged.  Fair enough.


> --- 2.6.18-rc7-mm1.orig/drivers/char/nwbutton.c
> +++ 2.6.18-rc7-mm1/drivers/char/nwbutton.c

This driver can be compiled as a module.  I shall add the missing export...

(And I'll fix the parisc build too)
-
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