From: Jan Beulich <JBeulich@novell.com>
Date: Tue, 27 Apr 2010 21:01:20 +0000 (-0700)
Subject: drivers/base/cpu.c: fix the output from /sys/devices/system/cpu/offline
X-Git-Tag: firefly_0821_release~10186^2~1538
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4f75f44a4a4437ad69beaac04047c4e66a956932;p=firefly-linux-kernel-4.4.55.git

drivers/base/cpu.c: fix the output from /sys/devices/system/cpu/offline

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@novell.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index e62a4ccea54d..1e2196fef1c7 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -149,7 +149,7 @@ static ssize_t print_cpus_offline(struct sysdev_class *class, char *buf)
 	/* 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);