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Oleg Nesterov
07c54cc598
After the recent commit5097cbcb38("sched/isolation: Prevent boot crash when the boot CPU is nohz_full") the kernel no longer crashes, but there is another problem. In this case tick_setup_device() calls tick_take_do_timer_from_boot() to update tick_do_timer_cpu and this triggers the WARN_ON_ONCE(irqs_disabled) in smp_call_function_single(). Kill tick_take_do_timer_from_boot() and just use WRITE_ONCE(), the new comment explains why this is safe (thanks Thomas!). Fixes:08ae95f4fd("nohz_full: Allow the boot CPU to be nohz_full") Signed-off-by: Oleg Nesterov <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Cc: [email protected] Link: https://lore.kernel.org/r/[email protected] Link: https://lore.kernel.org/all/[email protected]