linux-kernel - Re: [patch 5/3] fastboot: sync the async execution before late

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Date:	Tue, 29 Jul 2008 14:21:23 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Rene Herman <rene.herman@...access.nl>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu,
	Simon Arlott <simon@...e.lp0.eu>,
	Alan Stern <stern@...land.harvard.edu>,
	Daniel Walker <dwalker@...sta.com>
Subject: Re: [patch 5/3] fastboot: sync the async execution before
 late_initcall and move level 6s (sync) first

On Tue, 29 Jul 2008 23:12:11 +0200
Rene Herman <rene.herman@...access.nl> wrote:

> On 29-07-08 23:04, Arjan van de Ven wrote:
> 
> > On Tue, 29 Jul 2008 23:00:29 +0200
> >> Isn't this a bit confusing? All the other sync levels are directly
> >> after their respective levels. I can see why you want another level
> >> now, but shouldn't that mean late_initcall now wants to be 8,
> >> device_initcall 7 and your new 6s just 6 (device_core_initcall or
> >> something...)?
> >>
> > 
> > yeah it is.. but nobody is using them
> > 
> > I'll make a note to clean this up
> > 
> > (by removing the unused ones)
> 
> Fair enough. By the way:
> 
> > @@ -775,6 +776,11 @@ static void __init do_initcalls(void)
> >  		}
> >  		if (phase == 1 && call >= __async_initcall_end)
> >  			phase = 2;
> > +		if (phase == 2 && call >= __device_initcall_end) {
> > +			phase = 3;
> > +			/* make sure all async work is done before
> > level 7 */
> > +			flush_workqueue(async_init_wq);
> > +		}
> >  		if (phase != 1)
> >  			do_one_initcall(*call);
> 
> After this patch, there are now 2 flush_workqueue(async_init_wq)
> calls in do_initcalls. Should the other one remain as well?

yes because if you don't have any level 7's then you won't hit this
condition... you need the second one.

flush_workqueue is cheap for the nothing-in-there case.


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