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Subject[BUG] mm/vmalloc: ___might_sleep is called under a spinlock in __purge_vmap_area_lazy
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The ___might_sleep is called under a spinlock, and the function call 
graph is:
__purge_vmap_area_lazy (acquire the spinlock)
cond_resched_lock
___might_sleep

In this situation, ___might_sleep may prints error log message because a
spinlock is held.
A possible fix is to remove ___might_sleep in cond_resched_lock.

This bug is found by my static analysis tool and my code review.


Thanks,
Jia-Ju Bai

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