The 1st patch enhances BLK_MQ_F_NO_SCHED so that we can't change/ show available io schedulers on devices which don't support io scheduler. The 2nd patch passes BLK_MQ_F_NO_SCHED for avoiding one regression on mtip32xx, which is introduced by blk-mq io scheduler. The last two patches introduce BLK_MQ_F_SCHED_USE_HW_TAG so that we can allow to use hardware tag for scheduler, then mq-deadline can work well on mtip32xx. Even though other devices with enough hardware tag space can benefit from this feature too. The 1st two patches aims on v4.11, and the last two are for v4.12. Thanks, Ming Ming Lei (4): block: respect BLK_MQ_F_NO_SCHED mtip32xx: pass BLK_MQ_F_NO_SCHED blk-mq: introduce BLK_MQ_F_SCHED_USE_HW_TAG mtip32xx: use BLK_MQ_F_USE_SCHED_TAG block/blk-mq-sched.c | 10 +++++++++- block/blk-mq.c | 35 +++++++++++++++++++++++++++++------ block/elevator.c | 12 ++++++++++-- drivers/block/mtip32xx/mtip32xx.c | 2 +- include/linux/blk-mq.h | 1 + 5 files changed, 50 insertions(+), 10 deletions(-) -- 2.9.3
