Modify the reboot() syscall handler in kernel/reboot.c to call liveupdate_reboot() when processing the LINUX_REBOOT_CMD_KEXEC command. This ensures that the Live Update Orchestrator is notified just before the kernel executes the kexec jump. The liveupdate_reboot() function triggers the final LIVEUPDATE_FREEZE event, allowing participating subsystems to perform last-minute state saving within the blackout window, and transitions the LUO state machine to FROZEN. The call is placed immediately before kernel_kexec() to ensure LUO finalization happens at the latest possible moment before the kernel transition. If liveupdate_reboot() returns an error (indicating a failure during LUO finalization), the kexec operation is aborted to prevent proceeding with an inconsistent state. Signed-off-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx> --- kernel/reboot.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/reboot.c b/kernel/reboot.c index ec087827c85c..bdeb04a773db 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -13,6 +13,7 @@ #include <linux/kexec.h> #include <linux/kmod.h> #include <linux/kmsg_dump.h> +#include <linux/liveupdate.h> #include <linux/reboot.h> #include <linux/suspend.h> #include <linux/syscalls.h> @@ -797,6 +798,9 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, #ifdef CONFIG_KEXEC_CORE case LINUX_REBOOT_CMD_KEXEC: + ret = liveupdate_reboot(); + if (ret) + break; ret = kernel_kexec(); break; #endif -- 2.50.1.565.gc32cd1483b-goog