On Tue, 2018-07-24 at 16:10 +-0800, jianchao.wang wrote: +AD4- The blk+AF8-mq+AF8-hw+AF8-ctx structure is also per request+AF8-queue +AD4- Please refer to blk+AF8-mq+AF8-init+AF8-allocated+AF8-queue -+AD4- blk+AF8-mq+AF8-realloc+AF8-hw+AF8-ctxs Hello Jianchao, I think that Ming Lei's patch +ACI-blk-mq: remove synchronize+AF8-rcu() from blk+AF8-mq+AF8-del+AF8-queue+AF8-tag+AF8-set()+ACI- makes Roman's patch superfluous. When I reposted Roman's patch I had not yet noticed that Ming's patch is already in Jens' tree. See also https://www.mail-archive.com/linux-block+AEA-vger.kernel.org/msg22956.html. Bart.