linux-kernel - Re: [PATCH/RFC] SCHED: allow wait_on_bit functions to support a timeout.

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Date:	Wed, 30 Apr 2014 17:52:09 +1000
From:	NeilBrown <neilb@...e.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	NFS <linux-nfs@...r.kernel.org>, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH/RFC] SCHED: allow wait_on_bit functions to support a
 timeout.

On Wed, 30 Apr 2014 09:31:54 +0200 Peter Zijlstra <peterz@...radead.org>
wrote:

> On Wed, Apr 30, 2014 at 12:29:26PM +1000, NeilBrown wrote:
> > If you think it is a good cleanup I'll post a proper patch with all the right
> > Cc:s.
> 
> Yeah, its a good cleanup. Thanks!
> 
> > +static inline int
> > +wait_on_bit(void *word, int bit, unsigned mode)
> > +{
> > +	if (!test_bit(bit, word))
> > +		return 0;
> > +	return out_of_line_wait_on_bit(word, bit,
> > +				       bit_wait,
> > +				       mode & 65535);
> > +}
> > +
> > +static inline int
> > +wait_on_bit_io(void *word, int bit, unsigned mode)
> > +{
> > +	if (!test_bit(bit, word))
> > +		return 0;
> > +	return out_of_line_wait_on_bit(word, bit,
> > +				       bit_wait_io,
> > +				       mode & 65535);
> > +}
> 
> That actually fits on one <80 line. Also, where does the 16 bit mask
> come from? On which, I would write that in hex, 0xFFFF is slightly
> easier to recognise as (1<<16)-1.

That is a hangover from an earlier attempt which didn't work.  Thanks for
catching it.

I'll refresh and do some basic testing tomorrow and send it out, including to
Oleg.

Thanks,
NeilBrown

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