RDMA/srpt: Fix RCU debug build error

From: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/[email protected]>

Combination of CONFIG_DEBUG_OBJECTS_RCU_HEAD=y and CONFIG_INFINIBAND_SRPT=m produces the following build error.

ERROR: "init_rcu_head" [drivers/infiniband/ulp/srpt/ib_srpt.ko] undefined! make[1]: *** [scripts/Makefile.modpost:92: __modpost] Error 1
make: *** [Makefile:1216: modules] Error 2

The reason to it that init_rcu_head() is not exported and not supposed to be used in modules. It is needed for dynamic initialization of statically allocated rcu_head structures.

---
Changelog:
v0->v1:
* Added Bart's SOB.
* Updated commit message.
* Removed init_rcu_head() from srpt code.

---
 drivers/infiniband/ulp/srpt/ib_srpt.c | 2 --
 1 file changed, 2 deletions(-)

index bf37816a1b12..0373b7c40902 100644
@@ -1950,7 +1950,6 @@ static struct srpt_nexus *srpt_get_nexus(struct srpt_port *sport,
 			nexus = ERR_PTR(-ENOMEM);
 			break;
 		}
-		init_rcu_head(&tmp_nexus->rcu);
 		INIT_LIST_HEAD(&tmp_nexus->ch_list);
 		memcpy(tmp_nexus->i_port_id, i_port_id, 16);
 		memcpy(tmp_nexus->t_port_id, t_port_id, 16);

@@ -2110,7 +2109,6 @@ static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
 		goto reject;
 	}
 
-	init_rcu_head(&ch->rcu);
 	kref_init(&ch->kref);
 	ch->pkey = be16_to_cpu(pkey);
 	ch->nexus = nexus;

--
2.15.1

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Thanks, applied.

Doug Ledford <[email protected]>
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