linux-kernel - [PATCH] fix the output from /sys/devices/system/cpu/offline

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Date:	Fri, 19 Mar 2010 16:17:12 +0000
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Rusty Russell" <rusty@...tcorp.com.au>, <travis@....com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] fix the output from /sys/devices/system/cpu/offline

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>

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

--- linux-2.6.34-rc1/drivers/base/cpu.c
+++ 2.6.34-rc1-cpus-offline-display/drivers/base/cpu.c
@@ -185,7 +185,7 @@ 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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