[PATCH v2] x86/reboot: Add call to do_kernel_restart()

[Martin Schiller]

SoC devices like the Intel / MaxLinear Lightning Mountain must be reset
by the Reset Control Unit (RCU) instead of using  "normal"
x86 mechanisms like ACPI, BIOS, KBD, etc.

Therefore, the RCU driver (reset-intel-gw) registers a restart handler
which triggers the global reset signal.

Unfortunately, this is of no use as long as the restart chain is not
processed during reboot on x86 systems.

That's why do_kernel_restart() must be called when a reboot is
performed. This has long been common practice for other architectures.

Signed-off-by: Martin Schiller <ms@xxxxxxxxxx>
---
Changes in v2:
- Updated the commit message.
- Link to v1: https://lore.kernel.org/r/20260220-x86_do_kernel_restart-v1-1-a0cee49bbc80@xxxxxxxxxx
---
 arch/x86/kernel/reboot.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 6032fa9ec753ce938b1b523a7eab76370ee802de..ddff25a1efbe71171ca22ec21f50541517c1a464 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -773,12 +773,15 @@ static void __machine_emergency_restart(int emergency)
 	machine_ops.emergency_restart();
 }
 
-static void native_machine_restart(char *__unused)
+static void native_machine_restart(char *command)
 {
 	pr_notice("machine restart\n");
 
 	if (!reboot_force)
 		machine_shutdown();
+
+	do_kernel_restart(command);
+
 	__machine_emergency_restart(0);
 }
 

---
base-commit: 05f7e89ab9731565d8a62e3b5d1ec206485eeb0b
change-id: 20260220-x86_do_kernel_restart-ac125c71c5c3

Best regards,
-- 
Martin Schiller <ms@xxxxxxxxxx>