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rds: ib: Remove unused extern definition

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>
Link: https://patch.msgid.link/20250905101958.4028647-1-haakon.bugge@oracle.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

authored by

Håkon Bugge and committed by
Jakub Kicinski 9f0730b0 6e0cca6b

-1
-1
net/rds/ib_mr.h
··· 108 108 }; 109 109 110 110 extern struct workqueue_struct *rds_ib_mr_wq; 111 - extern bool prefer_frmr; 112 111 113 112 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev, 114 113 int npages);