On Thu, Jan 25, 2018 at 10:46:26AM +0800, Jia-Ju Bai wrote: > The function ioc_create_icq here is not called in atomic context. > Thus GFP_ATOMIC is not necessary, and it can be replaced with GFP_KERNEL. > > This is found by a static analysis tool named DCNS written by myself. Umm... Some human-readable analysis would be welcome. FWIW, I've tried to put a proof together, but... struct blk_mq_ops->timeout = nvme_timeout nvme_timeout() nvme_alloc_request() blk_mq_alloc_request_hctx() blk_mq_get_request() blk_mq_sched_assign_ioc() ... and while I have not traced the call chain further, the look of that function (nvme_timeout()) strongly suggests that it *is* meant to be called from bloody atomic context. "My tool has found that place/put together a proof" is nice, but it doesn't replace the proof itself...
