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authorEric W. Biederman <ebiederm@xmission.com>2005-07-26 11:24:14 -0600
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-26 14:35:41 -0700
commit4a00ea1e18228e5ef99d4780671fda97226bda30 (patch)
treed77c793ef68df78b3c9a73eab16438732f875c3c
parent47f61f397cc08b5a9a815bd03cb10c48dab66034 (diff)
[PATCH] Refactor sys_reboot into reusable parts
Because the factors of sys_reboot don't exist people calling into the reboot path duplicate the code badly, leading to inconsistent expectations of code in the reboot path. This patch should is just code motion. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--include/linux/reboot.h9
-rw-r--r--kernel/sys.c106
2 files changed, 73 insertions, 42 deletions
diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index 2d4dd23168d..828ba4f107d 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -55,6 +55,15 @@ extern void machine_shutdown(void);
struct pt_regs;
extern void machine_crash_shutdown(struct pt_regs *);
+/*
+ * Architecture independent implemenations of sys_reboot commands.
+ */
+
+extern void kernel_restart(char *cmd);
+extern void kernel_halt(void);
+extern void kernel_power_off(void);
+extern void kernel_kexec(void);
+
#endif
#endif /* _LINUX_REBOOT_H */
diff --git a/kernel/sys.c b/kernel/sys.c
index 5fc10d3e389..7e033809ef5 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -361,6 +361,62 @@ out_unlock:
return retval;
}
+void kernel_restart(char *cmd)
+{
+ notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
+ system_state = SYSTEM_RESTART;
+ device_suspend(PMSG_FREEZE);
+ device_shutdown();
+ if (!cmd) {
+ printk(KERN_EMERG "Restarting system.\n");
+ } else {
+ printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
+ }
+ printk(".\n");
+ machine_restart(cmd);
+}
+EXPORT_SYMBOL_GPL(kernel_restart);
+
+void kernel_kexec(void)
+{
+#ifdef CONFIG_KEXEC
+ struct kimage *image;
+ image = xchg(&kexec_image, 0);
+ if (!image) {
+ return;
+ }
+ notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
+ system_state = SYSTEM_RESTART;
+ device_suspend(PMSG_FREEZE);
+ device_shutdown();
+ printk(KERN_EMERG "Starting new kernel\n");
+ machine_shutdown();
+ machine_kexec(image);
+#endif
+}
+EXPORT_SYMBOL_GPL(kernel_kexec);
+
+void kernel_halt(void)
+{
+ notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
+ system_state = SYSTEM_HALT;
+ device_suspend(PMSG_SUSPEND);
+ device_shutdown();
+ printk(KERN_EMERG "System halted.\n");
+ machine_halt();
+}
+EXPORT_SYMBOL_GPL(kernel_halt);
+
+void kernel_power_off(void)
+{
+ notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
+ system_state = SYSTEM_POWER_OFF;
+ device_suspend(PMSG_SUSPEND);
+ device_shutdown();
+ printk(KERN_EMERG "Power down.\n");
+ machine_power_off();
+}
+EXPORT_SYMBOL_GPL(kernel_power_off);
/*
* Reboot system call: for obvious reasons only root may call it,
@@ -389,12 +445,7 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
lock_kernel();
switch (cmd) {
case LINUX_REBOOT_CMD_RESTART:
- notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
- system_state = SYSTEM_RESTART;
- device_suspend(PMSG_FREEZE);
- device_shutdown();
- printk(KERN_EMERG "Restarting system.\n");
- machine_restart(NULL);
+ kernel_restart(NULL);
break;
case LINUX_REBOOT_CMD_CAD_ON:
@@ -406,23 +457,13 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
break;
case LINUX_REBOOT_CMD_HALT:
- notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
- system_state = SYSTEM_HALT;
- device_suspend(PMSG_SUSPEND);
- device_shutdown();
- printk(KERN_EMERG "System halted.\n");
- machine_halt();
+ kernel_halt();
unlock_kernel();
do_exit(0);
break;
case LINUX_REBOOT_CMD_POWER_OFF:
- notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
- system_state = SYSTEM_POWER_OFF;
- device_suspend(PMSG_SUSPEND);
- device_shutdown();
- printk(KERN_EMERG "Power down.\n");
- machine_power_off();
+ kernel_power_off();
unlock_kernel();
do_exit(0);
break;
@@ -434,33 +475,14 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
}
buffer[sizeof(buffer) - 1] = '\0';
- notifier_call_chain(&reboot_notifier_list, SYS_RESTART, buffer);
- system_state = SYSTEM_RESTART;
- device_suspend(PMSG_FREEZE);
- device_shutdown();
- printk(KERN_EMERG "Restarting system with command '%s'.\n", buffer);
- machine_restart(buffer);
+ kernel_restart(buffer);
break;
-#ifdef CONFIG_KEXEC
case LINUX_REBOOT_CMD_KEXEC:
- {
- struct kimage *image;
- image = xchg(&kexec_image, 0);
- if (!image) {
- unlock_kernel();
- return -EINVAL;
- }
- notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
- system_state = SYSTEM_RESTART;
- device_suspend(PMSG_FREEZE);
- device_shutdown();
- printk(KERN_EMERG "Starting new kernel\n");
- machine_shutdown();
- machine_kexec(image);
- break;
- }
-#endif
+ kernel_kexec();
+ unlock_kernel();
+ return -EINVAL;
+
#ifdef CONFIG_SOFTWARE_SUSPEND
case LINUX_REBOOT_CMD_SW_SUSPEND:
{