Jens Axboe d373812398 blk-stat: don't use this_cpu_ptr() in a preemptable section ...

If PREEMPT_RCU is enabled, rcu_read_lock() isn't strong enough
for us to use this_cpu_ptr() in that section. Use the safer
get/put_cpu_ptr() variants instead.

Reported-by: Mike Galbraith <efault@gmx.de>
Fixes: 34dbad5d26 ("blk-stat: convert to callback-based statistics reporting")
Signed-off-by: Jens Axboe <axboe@fb.com>

2017-05-10 07:40:18 -06:00

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