From 022333427a8aa4ccb318a9db90cea4e69ca1826b Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Tue, 10 Mar 2015 23:49:26 -0400 Subject: [PATCH] dm: optimize dm_mq_queue_rq to _not_ use kthread if using pure blk-mq dm_mq_queue_rq() is in atomic context so care must be taken to not sleep -- as such GFP_ATOMIC is used for the md->bs bioset allocations and dm-mpath's call to blk_get_request(). In the future the bioset allocations will hopefully go away (by removing support for partial completions of bios in a cloned request). Also prepare for supporting DM blk-mq ontop of old-style request_fn device(s) if a new dm-mod 'use_blk_mq' parameter is set. The kthread will still be used to queue work if blk-mq is used ontop of old-style request_fn device(s). Signed-off-by: Mike Snitzer --- Reading git-format-patch failed