about in_atomic

["Min-Hua Chen" <orca.chen@xxxxxxxxx>]

hi:

Can anyone tell me the usage of in_atomic() macro?

(preempt_count() & ~PREEMPT_ACTIVE) means in interrupt or softirq or kernel preemption is disabled.
kernel_locked() means we are in BKL.



# define in_atomic()    ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())

thx