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

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Date:	Wed, 04 Jun 2008 15:04:10 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utonix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Gregory Haskins <ghaskins@...ell.com>,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 2/2] sched: fix cpupri priocount

A rounding error was pointed out by Peter Zijlstra which would result
in the structure holding priorities to be off by one.

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
CC: Peter Zijlstra <peterz@...radead.org>
---

 kernel/sched_cpupri.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_cpupri.h b/kernel/sched_cpupri.h
index 16d29b9..817c55c 100644
--- a/kernel/sched_cpupri.h
+++ b/kernel/sched_cpupri.h
@@ -4,7 +4,7 @@
 #include <linux/sched.h>
 
 #define CPUPRI_NR_PRIORITIES 2+MAX_RT_PRIO
-#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
 
 #define CPUPRI_INVALID -1
 #define CPUPRI_IDLE     0

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