Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)

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To: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxx>
Subject: Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
From: Jason Gunthorpe <jgg@xxxxxxxx>
Date: Mon, 22 Jul 2019 13:04:48 -0300
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, aarcange@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, christian@xxxxxxxxxx, davem@xxxxxxxxxxxxx, ebiederm@xxxxxxxxxxxx, elena.reshetova@xxxxxxxxx, guro@xxxxxx, hch@xxxxxxxxxxxxx, james.bottomley@xxxxxxxxxxxxxxxxxxxxx, jasowang@xxxxxxxxxx, jglisse@xxxxxxxxxx, keescook@xxxxxxxxxxxx, ldv@xxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, luto@xxxxxxxxxxxxxx, mhocko@xxxxxxxx, mingo@xxxxxxxxxx, namit@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, syzkaller-bugs@xxxxxxxxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, wad@xxxxxxxxxxxx
In-reply-to: <20190722155235.GF14271@linux.ibm.com>
References: <000000000000964b0d058e1a0483@google.com> <20190721044615-mutt-send-email-mst@kernel.org> <20190721081933-mutt-send-email-mst@kernel.org> <20190721131725.GR14271@linux.ibm.com> <20190721210837.GC363@bombadil.infradead.org> <20190721233113.GV14271@linux.ibm.com> <20190722035042-mutt-send-email-mst@kernel.org> <20190722115149.GY14271@linux.ibm.com> <20190722134152.GA13013@ziepe.ca> <20190722155235.GF14271@linux.ibm.com>
User-agent: Mutt/1.9.4 (2018-02-28)

On Mon, Jul 22, 2019 at 08:52:35AM -0700, Paul E. McKenney wrote:
> So why then is there a problem?

I'm not sure there is a real problem, I thought Michael was just
asking how to design with RCU in the case where the user controls the
kfree_rcu??

Sounds like the answer is "don't worry about it" ?

Thanks,
Jason

Follow-Ups:
- Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
  - From: Paul E. McKenney
- Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
  - From: Michael S. Tsirkin

References:
- Re: WARNING in __mmdrop
  - From: syzbot
- Re: WARNING in __mmdrop
  - From: Michael S. Tsirkin
- RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
  - From: Michael S. Tsirkin
- Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
  - From: Paul E. McKenney
- Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
  - From: Matthew Wilcox
- Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
  - From: Paul E. McKenney
- Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
  - From: Michael S. Tsirkin
- Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
  - From: Paul E. McKenney
- Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
  - From: Jason Gunthorpe
- Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
  - From: Paul E. McKenney

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