On Mon, Oct 09, 2017 at 12:00:33PM +0800, Jia-Ju Bai wrote: > 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.
This analysis doesn't makes sense. The point of cond_resched_lock() is that it drops the lock, if resched is required. ___might_sleep() is called with preempt_offset equal to PREEMPT_LOCK_OFFSET, so it won't report error if it's the only lock we hold. -- Kirill A. Shutemov
