x86/reboot: Execute the kernel restart handler upon machine restart

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.

  [ bp: Massage commit message. ]

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260225-x86_do_kernel_restart-v2-1-81396cf3d44c@dev.tdt.de

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 6032fa9ec753ce938b1b523a7eab76370ee802de..ddff25a1efbe71171ca22ec21f50541517c1a464 100644 (file)
--- 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);
 }