From: Dennis Dalessandro <dennis.dalessandro@intel.com>
To: Jason Gunthorpe <jgg@ziepe.ca>, madhuparnabhowmik04@gmail.com
Cc: mike.marciniszyn@intel.com, paulmck@kernel.org,
joel@joelfernandes.org, frextrite@gmail.com,
linux-kernel-mentees@lists.linuxfoundation.org,
rcu@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] infiniband: hw: hfi1: verbs.c: Use built-in RCU list checking
Date: Tue, 14 Jan 2020 12:00:19 -0500 [thread overview]
Message-ID: <74adec84-ec5b-ea1b-7adf-3f8608838259@intel.com> (raw)
In-Reply-To: <20200114165740.GB22037@ziepe.ca>
On 1/14/2020 11:57 AM, Jason Gunthorpe wrote:
> On Tue, Jan 14, 2020 at 09:53:45PM +0530, madhuparnabhowmik04@gmail.com wrote:
>> From: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.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@gmail.com>
>> drivers/infiniband/hw/hfi1/verbs.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/infiniband/hw/hfi1/verbs.c b/drivers/infiniband/hw/hfi1/verbs.c
>> index 089e201d7550..22f2d4fd2577 100644
>> +++ b/drivers/infiniband/hw/hfi1/verbs.c
>> @@ -515,7 +515,7 @@ 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, lockdep_is_held(&(ibp->rvp.lock))) {
>
> Okay, this looks reasonable
>
> Mike, Dennis, is this the right lock to test?
>
I'm looking at that right now actually, I don't think this is correct.
Wanted to talk to Mike before I send a response though.
-Denny
next prev parent reply other threads:[~2020-01-14 17:00 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-14 16:23 [PATCH 1/3] infiniband: hw: hfi1: verbs.c: Use built-in RCU list checking madhuparnabhowmik04
2020-01-14 16:57 ` Jason Gunthorpe
2020-01-14 17:00 ` Dennis Dalessandro [this message]
2020-01-14 18:24 ` Dennis Dalessandro
2020-01-14 19:17 ` Joel Fernandes
2020-01-14 19:41 ` Jason Gunthorpe
2020-01-14 19:46 ` Dennis Dalessandro
[not found] ` <CAF65HP0RsW5FMRRf5Lia2=MTKex-KwO7-_NsCUef94YKBg+pfA@mail.gmail.com>
2020-02-14 17:24 ` Dennis Dalessandro
-- strict thread matches above, loose matches on Subject: below --
2020-01-07 19:29 madhuparnabhowmik04
2020-01-07 20:33 ` Jason Gunthorpe
2020-01-09 18:10 ` Jason Gunthorpe
2020-01-10 15:54 ` Joel Fernandes
2020-01-07 17:35 madhuparnabhowmik04
2020-01-07 18:26 ` Jason Gunthorpe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=74adec84-ec5b-ea1b-7adf-3f8608838259@intel.com \
--to=dennis.dalessandro@intel.com \
--cc=frextrite@gmail.com \
--cc=jgg@ziepe.ca \
--cc=joel@joelfernandes.org \
--cc=linux-kernel-mentees@lists.linuxfoundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=madhuparnabhowmik04@gmail.com \
--cc=mike.marciniszyn@intel.com \
--cc=paulmck@kernel.org \
--cc=rcu@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox