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From: Dennis Dalessandro <dennis.dalessandro@intel.com>
To: madhuparnabhowmik04@gmail.com, mike.marciniszyn@intel.com,
	jgg@ziepe.ca, paulmck@kernel.org
Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
	rcu@vger.kernel.org, joel@joelfernandes.org,
	linux-kernel-mentees@lists.linuxfoundation.org
Subject: Re: [Linux-kernel-mentees] [PATCH 3/3] infiniband: sw: rdmavt: mcast.c: Use built-in RCU list checking
Date: Fri, 14 Feb 2020 12:26:34 -0500
Message-ID: <b9a48945-7fc7-2463-2b56-61ad43e54754@intel.com> (raw)
In-Reply-To: <20200114162536.20388-1-madhuparnabhowmik04@gmail.com>

On 1/14/2020 11:25 AM, madhuparnabhowmik04@gmail.com wrote:
> From: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
> 
> Use built-in RCU and lock-checking for list_for_each_entry_rcu()
> by passing the cond argument.
> 
> Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
> ---
>   drivers/infiniband/sw/rdmavt/mcast.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/sw/rdmavt/mcast.c b/drivers/infiniband/sw/rdmavt/mcast.c
> index dd11c6fcd060..31c7f12c7665 100644
> --- a/drivers/infiniband/sw/rdmavt/mcast.c
> +++ b/drivers/infiniband/sw/rdmavt/mcast.c
> @@ -224,7 +224,7 @@ static int rvt_mcast_add(struct rvt_dev_info *rdi, struct rvt_ibport *ibp,
>   		}
>   
>   		/* Search the QP list to see if this is already there. */
> -		list_for_each_entry_rcu(p, &tmcast->qp_list, list) {
> +		list_for_each_entry_rcu(p, &tmcast->qp_list, list, lockdep_is_held(&(ibp->lock))) {
>   			if (p->qp == mqp->qp) {
>   				ret = ESRCH;
>   				goto bail;
> 

This one is OK. The lock is held and it is the correct one to use when 
updating the list.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-14 16:25 madhuparnabhowmik04
2020-02-14 17:26 ` Dennis Dalessandro [this message]
  -- strict thread matches above, loose matches on Subject: below --
2020-01-07 19:31 madhuparnabhowmik04
2020-01-07 17:35 [Linux-kernel-mentees] [PATCH 1/3] infiniband: hw: hfi1: verbs.c: " madhuparnabhowmik04
2020-01-07 17:35 ` [Linux-kernel-mentees] [PATCH 3/3] infiniband: sw: rdmavt: mcast.c: " madhuparnabhowmik04

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