In the old days, RDS used FMR (Fast Memory Registration) to register IB MRs to be used by RDMA. A newer and better verbs based registration/de-registration method called FRWR (Fast Registration Work Request) was added to RDS by commit 1659185fb4d0 ("RDS: IB: Support Fastreg MR (FRMR) memory registration mode") in 2016.

Detection and enablement of FRWR was done in commit 2cb2912d6563 ("RDS: IB: add Fastreg MR (FRMR) detection support"). But said commit added an extern bool prefer_frmr, which was not used by said commit - nor used by later commits. Hence, remove it.

Signed-off-by: Håkon Bugge haakon.bugge@oracle.com Reviewed-by: Allison Henderson allison.henderson@oracle.com

---

v3 -> v4: * Added Allison's r-b * Removed indentation for this section

v2 -> v3: * As per Jakub's request, removed Cc: and Fixes: tags * Subject to net-next (instead of net)

v1 -> v2: * Added commit message * Added Cc: stable@vger.kernel.org --- net/rds/ib_mr.h | 1 - 1 file changed, 1 deletion(-)

diff --git a/net/rds/ib_mr.h b/net/rds/ib_mr.h index ea5e9aee4959e..5884de8c6f45b 100644 --- a/net/rds/ib_mr.h +++ b/net/rds/ib_mr.h @@ -108,7 +108,6 @@ struct rds_ib_mr_pool { };

extern struct workqueue_struct *rds_ib_mr_wq; -extern bool prefer_frmr;

struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev, int npages);