[PATCH] Add emergency_restart()

When the kernel is working well and we want to restart cleanly
kernel_restart is the function to use.   But in many instances
the kernel wants to reboot when thing are expected to be working
very badly such as from panic or a software watchdog handler.

This patch adds the function emergency_restart() so that
callers can be clear what semantics they expect when calling
restart.  emergency_restart() is expected to be callable
from interrupt context and possibly reliable in even more
trying circumstances.

This is an initial generic implementation for all architectures.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/kernel/sys.c b/kernel/sys.c
index 31ac41a73329..a74039036fb4 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -361,6 +361,12 @@ out_unlock:
         return retval;
 }
 
+void emergency_restart(void)
+{
+        machine_emergency_restart();
+}
+EXPORT_SYMBOL_GPL(emergency_restart);
+
 void kernel_restart(char *cmd)
 {
         notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);