From: Caleb Sander Mateos Date: Thu, 18 Sep 2025 01:49:45 +0000 (-0600) Subject: ublk: don't access ublk_queue in ublk_daemon_register_io_buf() X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ce88e3ef33d35c740d26342be5d8f65972fd5597;p=users%2Fhch%2Fmisc.git ublk: don't access ublk_queue in ublk_daemon_register_io_buf() For ublk servers with many ublk queues, accessing the ublk_queue in ublk_daemon_register_io_buf() is a frequent cache miss. Get the flags from the ublk_device instead, which is accessed earlier in ublk_ch_uring_cmd_local(). Signed-off-by: Caleb Sander Mateos Reviewed-by: Ming Lei Signed-off-by: Jens Axboe --- diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 751ec62655f8..266b46d40886 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -2169,7 +2169,7 @@ ublk_daemon_register_io_buf(struct io_uring_cmd *cmd, return ublk_register_io_buf(cmd, ub, ubq, io, index, issue_flags); - if (!ublk_support_zero_copy(ubq) || !ublk_rq_has_data(req)) + if (!ublk_dev_support_zero_copy(ub) || !ublk_rq_has_data(req)) return -EINVAL; ret = io_buffer_register_bvec(cmd, req, ublk_io_release, index,