linux-kernel - [patch 050/164] drivers/base/cpu.c: fix the output from /sys/devices/system/cpu/offline

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Message-Id: <20100701173431.049378967@clark.site>
Date:	Thu, 01 Jul 2010 10:33:56 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jan Beulich <jbeulich@...ell.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [patch 050/164] drivers/base/cpu.c: fix the output from /sys/devices/system/cpu/offline

2.6.33-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit cdc6e3d3968052cebb2f2ddcd742bff29fbd1a90 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/base/cpu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -183,7 +183,7 @@ static ssize_t print_cpus_offline(struct
 	/* 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);
 


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