linux-kernel - Re: [PATCH 1/3] infiniband: hw: hfi1: verbs.c: Use built-in RCU list checking

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Date:   Tue, 7 Jan 2020 16:33:54 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     madhuparnabhowmik04@...il.com
Cc:     dennis.dalessandro@...el.com, mike.marciniszyn@...el.com,
        dledford@...hat.com, paulmck@...nel.org, rcu@...r.kernel.org,
        joel@...lfernandes.org, frextrite@...il.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] infiniband: hw: hfi1: verbs.c: Use built-in RCU list
 checking

On Wed, Jan 08, 2020 at 12:59:12AM +0530, madhuparnabhowmik04@...il.com wrote:
> From: Madhuparna Bhowmik <madhuparnabhowmik04@...il.com>
> 
> list_for_each_entry_rcu has built-in RCU and lock checking.
> Pass cond argument to list_for_each_entry_rcu.
> 
> Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@...il.com>
>  drivers/infiniband/hw/hfi1/verbs.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/hw/hfi1/verbs.c b/drivers/infiniband/hw/hfi1/verbs.c
> index 089e201d7550..e6abdbcb4ffb 100644
> +++ b/drivers/infiniband/hw/hfi1/verbs.c
> @@ -515,7 +515,8 @@ static inline void hfi1_handle_packet(struct hfi1_packet *packet,
>  				       opa_get_lid(packet->dlid, 9B));
>  		if (!mcast)
>  			goto drop;
> -		list_for_each_entry_rcu(p, &mcast->qp_list, list) {
> +		list_for_each_entry_rcu(p, &mcast->qp_list, list,
> +					lock_is_held(&(ibp->rvp.lock).dep_map)) {

Why .dep_map? Does this compile?

Jason