linux-kernel - Re: RFC: call_rcu_outstanding (was Re: WARNING in _

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Message-ID: <20190722160448.GH7607@ziepe.ca>
Date:   Mon, 22 Jul 2019 13:04:48 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Matthew Wilcox <willy@...radead.org>, aarcange@...hat.com,
        akpm@...ux-foundation.org, christian@...uner.io,
        davem@...emloft.net, ebiederm@...ssion.com,
        elena.reshetova@...el.com, guro@...com, hch@...radead.org,
        james.bottomley@...senpartnership.com, jasowang@...hat.com,
        jglisse@...hat.com, keescook@...omium.org, ldv@...linux.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-parisc@...r.kernel.org,
        luto@...capital.net, mhocko@...e.com, mingo@...nel.org,
        namit@...are.com, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk,
        wad@...omium.org
Subject: Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)

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