> timer interrupt could happen also in the other CPU a picosecond before
> we'll release the global_bh_count lock. So to fix all races a spinlock is
> necessary. [..]
i believe that is completely unnecessery - remember, if an IRQ happens on
another CPU, then _that_ CPU will call do_bottom_halves soon. So the only
thing that has to be ensured: the bh flags manipulated atomically.
-- mingo
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