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 e62a4ccea54d0c4a3dc6dcd84eb107e557bcb54c..1e2196fef1c75ecf0bcfeef1dab216856e923605 100644 (file)
--- 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);