linux-kernel - [PATCH 01/38] drivers/base/cpu.c: fix the output from /sys/devices/system/cpu/offline

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Date:	Fri, 21 May 2010 09:53:31 -0700
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Jan Beulich <JBeulich@...ell.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	stable <stable@...nel.org>, Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 01/38] drivers/base/cpu.c: fix the output from /sys/devices/system/cpu/offline

From: Jan Beulich <JBeulich@...ell.com>

Without CONFIG_CPUMASK_OFFSTACK, simply inverting cpu_online_mask leads
to CPUs beyond nr_cpu_ids to be displayed twice and CPUs not even
possible to be displayed as offline.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Cc: stable <stable@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/base/cpu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index f35719a..251acea 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -186,7 +186,7 @@ static ssize_t print_cpus_offline(struct sysdev_class *class,
 	/* display offline cpus < nr_cpu_ids */
 	if (!alloc_cpumask_var(&offline, GFP_KERNEL))
 		return -ENOMEM;
-	cpumask_complement(offline, cpu_online_mask);
+	cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask);
 	n = cpulist_scnprintf(buf, len, offline);
 	free_cpumask_var(offline);
 
-- 
1.7.0.3

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