linux-kernel - Re: [PATCH 7/10 v2] Generic Watchdog Timer Driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 22 Jun 2011 21:56:02 +0200
From:	Wim Van Sebroeck <wim@...ana.be>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linux Watchdog Mailing List <linux-watchdog@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 7/10 v2] Generic Watchdog Timer Driver

Hi Arnd,

> On Saturday 18 June 2011 19:25:37 Wim Van Sebroeck wrote:
> > diff -urN linux-2.6.38-generic-part6/Documentation/watchdog/src/watchdog-with-timer-example.c linux-2.6.38-generic-part7/Documentation/watchdog/src/watchdog-with-timer-example.c
> > --- linux-2.6.38-generic-part6/Documentation/watchdog/src/watchdog-with-timer-example.c 2011-06-16 21:04:06.283940741 +0200
> > +++ linux-2.6.38-generic-part7/Documentation/watchdog/src/watchdog-with-timer-example.c 2011-06-17 09:52:32.866632635 +0200
> > @@ -45,6 +45,11 @@
> >  MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. "
> >         "(default = " __MODULE_STRING(WDT_TIMEOUT) ")");
> >  
> > +static int nowayout = WATCHDOG_NOWAYOUT;
> > +module_param(nowayout, int, 0);
> > +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started. "
> > +       "(default = " __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> > +
> >  static struct watchdog_device wdt_dev;
> >  static void wdt_timer_tick(unsigned long data);
> >  static DEFINE_TIMER(timer, wdt_timer_tick, 0, 0);
> > @@ -152,6 +157,8 @@
> >  
> >         /* Set watchdog_device parameters */
> >         wdt_dev.timeout = timeout;
> > +       if (nowayout)
> > +               set_bit(WDOG_NO_WAY_OUT, &wdt_dev.status);
> >  
> >         /* Register the watchdog timer device */
> >         res = watchdog_register_device(&wdt_dev);
> 
> Why is this a feature of the individual drivers and not of the core?

Some drivers/devices will need it (like Alan allready explained), where
others don't.

> Maybe it can be in both, so existing drivers don't need to change the user
> interface, but new drivers don't have to provide the option individually
> when you can simply set it for the base module.

the CONFIG_WATCHDOG_NOWAYOUT option in Kconfig allready stores the default
behaviour for all your drivers. the module param is initialized with it
during compilation ans allows to have it changed when you load the module.

Kind regards,
Wim.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/