linux-kernel - RE: [PATCH 2/2] sched: fix cpupri priocount

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Date:	Wed, 4 Jun 2008 16:35:28 -0500
From:	"Rune Torgersen" <runet@...ovsys.com>
To:	"Peter Zijlstra" <peterz@...radead.org>,
	"Gregory Haskins" <ghaskins@...ell.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utonix.de>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"Arnaldo Carvalho de Melo" <acme@...hat.com>,
	<linux-kernel@...r.kernel.org>, <linux-rt-users@...r.kernel.org>
Subject: RE: [PATCH 2/2] sched: fix cpupri priocount

> > -#define CPUPRI_NR_PRI_WORDS CPUPRI_NR_PRIORITIES/BITS_PER_LONG
> > +#define CPUPRI_NR_PRI_WORDS (CPUPRI_NR_PRIORITIES + >
BITS_PER_LONG/2)/BITS_PER_LONG
> 
> (33 + 16) / 32 = 49 / 32 = 1
> 

It should not round to neares but round up....
So... #define CPUPRI_NR_PRI_WORDS (CPUPRI_NR_PRIORITIES + BITS_PER_LONG
- 1)/BITS_PER_LONG

=> (33+31)/32 = 64/32 = 2
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