[PATCH 7/8] kernel/power/main.c: Not suspend/resume if CPU0 is offlined

[Fenghua Yu]

From: Fenghua Yu <fenghua.yu@xxxxxxxxx>

System resumes from CPU0 on today's x86 BIOS. Don't suspend/resume if CPU0 is
offlined and bsp_hotpluggable is 1.

Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
---
 kernel/power/main.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/kernel/power/main.c b/kernel/power/main.c
index 6c601f8..33ffb6a 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -12,6 +12,7 @@
 #include <linux/string.h>
 #include <linux/resume-trace.h>
 #include <linux/workqueue.h>
+#include <linux/cpu.h>
 
 #include "power.h"
 
@@ -178,6 +179,14 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 	int len;
 	int error = -EINVAL;
 
+#ifdef CONFIG_HOTPLUG_CPU
+	if (bsp_hotpluggable && cpumask_first(cpu_online_mask) != 0) {
+		printk(KERN_WARNING "Because CPU0 is offlined, system can't suspend/resume.\n");
+
+		return -ENODEV;
+	}
+#endif
+
 	p = memchr(buf, '\n', n);
 	len = p ? p - buf : n;
 
-- 
1.6.0.3

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