might_sleep() debugging and smp_processor_id() debugging should be active right after the scheduler starts working. The init task can invoke smp_processor_id() from preemptible context as it is pinned on the boot cpu until sched_smp_init() removes the pinning and lets it schedule on all non isolated cpus.
Add a new state which allows to enable those checks earlier and add it to the xen do_poweroff() function. No functional change. Signed-off-by: Thomas Gleixner <[email protected]> Cc: Boris Ostrovsky <[email protected]> Cc: Juergen Gross <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> --- V2: Use only one intermediate state and document that state order matters. drivers/xen/manage.c | 1 + include/linux/kernel.h | 6 +++++- 2 files changed, 6 insertions(+), 1 deletion(-) --- a/drivers/xen/manage.c +++ b/drivers/xen/manage.c @@ -190,6 +190,7 @@ static void do_poweroff(void) { switch (system_state) { case SYSTEM_BOOTING: + case SYSTEM_SCHEDULING: orderly_poweroff(true); break; case SYSTEM_RUNNING: --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -490,9 +490,13 @@ extern int root_mountflags; extern bool early_boot_irqs_disabled; -/* Values used for system_state */ +/* + * Values used for system_state. Ordering of the states must not be changed + * as code checks for <, <=, >, >= STATE. + */ extern enum system_states { SYSTEM_BOOTING, + SYSTEM_SCHEDULING, SYSTEM_RUNNING, SYSTEM_HALT, SYSTEM_POWER_OFF,
