On Wed, Dec 06, 2017 at 01:25:11PM +0100, Christian Borntraeger wrote: t > commit 11b2025c3326f7096ceb588c3117c7883850c068 -> bad > blk-mq: create a blk_mq_ctx for each possible CPU > does not boot on DASD and > commit 9c6ae239e01ae9a9f8657f05c55c4372e9fc8bcc -> good > genirq/affinity: assign vectors to all possible CPUs > does boot with DASD disks. > > Also adding Stefan Haberland if he has an idea why this fails on DASD and adding Martin (for the > s390 irq handling code). That is interesting as it really isn't related to interrupts at all, it just ensures that possible CPUs are set in ->cpumask. I guess we'd really want: e005655c389e3d25bf3e43f71611ec12f3012de0 "blk-mq: only select online CPUs in blk_mq_hctx_next_cpu" before this commit, but it seems like the whole stack didn't work for your either. I wonder if there is some weird thing about nr_cpu_ids in s390?
