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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 commit1659185fb4("RDS: IB: Support Fastreg MR (FRMR) memory registration mode") in 2016. Detection and enablement of FRWR was done in commit2cb2912d65("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>