Re: [patch] fix emergency reboot: call reboot notifier list if possible

[Pavel Machek <pavel@ucw.cz>]

Hi!

> > > On Wed, Jan 17, 2007 at 10:13:19AM +0100, Ingo Molnar wrote:
> > > > we dont call the reboot notifiers during emergency reboot mainly because 
> > > > it could be called from atomic context and reboot notifiers are a 
> > > > blocking notifier list. But actually the kernel is often perfectly 
> > > > reschedulable in this stage, so we could as well process the 
> > > > reboot_notifier_list.
> > > 
> > > My experience has been that when there has been the need to use this
> > > facility, the kernel hasn't been reschedulable. [...]
> > 
> > this decision is totally automatic - so if your situation happens and 
> > the kernel isnt reschedulable, then the notifier chain wont be called 
> > and nothing changes from your perspective. Hm, perhaps this should be 
> > dependent on CONFIG_PREEMPT, to make sure preempt_count() is reliable?
> > 
> > but from my perspective this patch fixes a real regression.
> > 
> > updated patch attached below.
> > 
> 
> Making it dependent upon CONFIG_PREEMPT seems a bit sucky.  Perhaps pass in
> some "you were called from /proc/sysrq-trigger" notification?

What about adding 'B' with 'reboot with notifications' meaning?
							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html