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SubjectRe: [PATCH 2/4] printk: disable optimistic spin during panic
Date
> Is there something that prevents panic CPU from NMI hlt CPU which is
> in console_trylock() under raw_spin_lock_irqsave()?
>
> CPU0 CPU1
> console_trylock_spinnning()
> console_trylock()
> down_trylock()
> raw_spin_lock_irqsave(&sem->lock)
>
> panic()
> crash_smp_send_stop()
> NMI -> HALT

This is a good point. I wonder if console_flush_on_panic() should
perform a sema_init() before it does console_trylock().

John

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