For ublk servers with many ublk queues, accessing the ublk_queue in ublk_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 --- drivers/block/ublk_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index cb51f3f3cd33..751ec62655f8 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -2131,11 +2131,11 @@ static int ublk_register_io_buf(struct io_uring_cmd *cmd, unsigned int index, unsigned int issue_flags) { struct request *req; int ret; - if (!ublk_support_zero_copy(ubq)) + if (!ublk_dev_support_zero_copy(ub)) return -EINVAL; req = __ublk_check_and_get_req(ub, ubq, io, 0); if (!req) return -EINVAL; -- 2.45.2