[PATCH rdma-next v1] RDMA/srpt: Fix RCU debug build error

[PATCH rdma-next v1] RDMA/srpt: Fix RCU debug build error

[Leon Romanovsky]

From: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

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.

Fixes: 795bc112cd5a ("IB/srpt: Make it safe to use RCU for srpt_device.rch_list")
Fixes: a11253142e6d ("IB/srpt: Rework multi-channel support")
Signed-off-by: Bart Van Assche <bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
Signed-off-by: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
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(-)

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index bf37816a1b12..0373b7c40902 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -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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Re: [PATCH rdma-next v1] RDMA/srpt: Fix RCU debug build error

[Doug Ledford]

[-- Attachment #1: Type: text/plain, Size: 1154 bytes --]

On Wed, 2018-01-24 at 08:56 +0200, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> 
> 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.
> 
> Fixes: 795bc112cd5a ("IB/srpt: Make it safe to use RCU for srpt_device.rch_list")
> Fixes: a11253142e6d ("IB/srpt: Rework multi-channel support")
> Signed-off-by: Bart Van Assche <bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
> Signed-off-by: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Thanks, applied.

-- 
Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
    GPG KeyID: B826A3330E572FDD
    Key fingerprint = AE6B 1BDA 122B 23B4 265B  1274 B826 A333 0E57 2FDD

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