[PATCH] reboot: re-enable the function of variable reboot_default

[Chuansheng Liu <chuansheng.liu@intel.com>]

commit b3a5d02ee070c(reboot: move arch/x86 reboot= handling to generic kernel)
did some cleanup for reboot= command line, but it made the reboot_default
to be invalidated.

The default value of variable reboot_default should be 1, and if command line
reboot= is not set, system will use the default reboot mode.

Signed-off-by: Li Fei <fei.li@intel.com>
Signed-off-by: liu chuansheng <chuansheng.liu@intel.com>
---
 kernel/reboot.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/kernel/reboot.c b/kernel/reboot.c
index 269ed93..d82eb6e 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -32,7 +32,14 @@ EXPORT_SYMBOL(cad_pid);
 #endif
 enum reboot_mode reboot_mode DEFAULT_REBOOT_MODE;
 
-int reboot_default;
+/*
+ * This variable is used privately to keep track of whether or not
+ * reboot_type is still set to its default value (i.e., reboot= hasn't
+ * been set on the command line).  This is needed so that we can
+ * suppress DMI scanning for reboot quirks.  Without it, it's
+ * impossible to override a faulty reboot quirk without recompiling.
+*/
+int reboot_default = 1;
 int reboot_cpu;
 enum reboot_type reboot_type = BOOT_ACPI;
 int reboot_force;
-- 
1.7.0.4