summaryrefslogtreecommitdiffstats
path: root/kernel/kexec.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/kexec.c')
-rw-r--r--kernel/kexec.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 6db42ff8d520..a0d920915b38 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -24,6 +24,8 @@
#include <linux/utsrelease.h>
#include <linux/utsname.h>
#include <linux/numa.h>
+#include <linux/suspend.h>
+#include <linux/device.h>
#include <asm/page.h>
#include <asm/uaccess.h>
@@ -242,6 +244,12 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
goto out;
}
+ image->swap_page = kimage_alloc_control_pages(image, 0);
+ if (!image->swap_page) {
+ printk(KERN_ERR "Could not allocate swap buffer\n");
+ goto out;
+ }
+
result = 0;
out:
if (result == 0)
@@ -986,6 +994,8 @@ asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
if (result)
goto out;
+ if (flags & KEXEC_PRESERVE_CONTEXT)
+ image->preserve_context = 1;
result = machine_kexec_prepare(image);
if (result)
goto out;
@@ -1411,3 +1421,50 @@ static int __init crash_save_vmcoreinfo_init(void)
}
module_init(crash_save_vmcoreinfo_init)
+
+/**
+ * kernel_kexec - reboot the system
+ *
+ * Move into place and start executing a preloaded standalone
+ * executable. If nothing was preloaded return an error.
+ */
+int kernel_kexec(void)
+{
+ int error = 0;
+
+ if (xchg(&kexec_lock, 1))
+ return -EBUSY;
+ if (!kexec_image) {
+ error = -EINVAL;
+ goto Unlock;
+ }
+
+ if (kexec_image->preserve_context) {
+#ifdef CONFIG_KEXEC_JUMP
+ local_irq_disable();
+ save_processor_state();
+#endif
+ } else {
+ blocking_notifier_call_chain(&reboot_notifier_list,
+ SYS_RESTART, NULL);
+ system_state = SYSTEM_RESTART;
+ device_shutdown();
+ sysdev_shutdown();
+ printk(KERN_EMERG "Starting new kernel\n");
+ machine_shutdown();
+ }
+
+ machine_kexec(kexec_image);
+
+ if (kexec_image->preserve_context) {
+#ifdef CONFIG_KEXEC_JUMP
+ restore_processor_state();
+ local_irq_enable();
+#endif
+ }
+
+ Unlock:
+ xchg(&kexec_lock, 0);
+
+ return error;
+}