linux-kernel - Re: [PATCH RFC] s390/sclp: pass timeout as HZ independent value

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Date:	Fri, 29 May 2015 14:01:51 +0200
From:	Michael Holzheu <holzheu@...ux.vnet.ibm.com>
To:	Nicholas Mc Guire <der.herr@...r.at>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Nicholas Mc Guire <hofrat@...dl.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux390@...ibm.com, linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] s390/sclp: pass timeout as HZ independent value

On Fri, 29 May 2015 13:49:36 +0200
Nicholas Mc Guire <der.herr@...r.at> wrote:

> On Fri, 29 May 2015, Heiko Carstens wrote:
> 
> > On Fri, May 29, 2015 at 11:51:54AM +0200, Nicholas Mc Guire wrote:
> > > On Fri, 29 May 2015, Heiko Carstens wrote:
> > > > Yes, the orginal code seems to be broken. Since I've no idea what the intended
> > > > timeout value should be, let's simply ask Michael, who wrote this code eight
> > > > years ago ;)
> > > > While these lines get touched anyway, it would make sense to use
> > > > schedule_timeout_interruptible() instead, and get rid of set_current_state().
> > > >
> > > Well that is not really equivalent
> > > schedule_timeout_interruptible() is doing
> > > __set_current_state not set_current_state
> > > so that would drop the mb() and no WRITE_ONCE()
> > 
> > And how does that matter in this case?
> >
> I do not know - did not look into it - in any case
> its not a 1:1 API consolidation that all I wanted to point out
> before changing anything.

I agree, 1:1 consolidation is better here.

But I would like to remove the SDIAS_SLEEP_TICKS define and just
use HZ / 2 in schedule_timeout(). Could you please resend the
updated patch? We will then add it to our tree.

Thanks
Michael

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