linux-kernel - Re: [PATCH 07/13] RDMA/rxe: Rename kfree_rcu() to kfree_rcu

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Date:   Tue, 14 Mar 2023 14:31:07 +0800
From:   Zhu Yanjun <zyjzyj2000@...il.com>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>,
        linux-rdma@...r.kernel.org, Bob Pearson <rpearsonhpe@...il.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
        Jens Axboe <axboe@...nel.dk>,
        Philipp Reisner <philipp.reisner@...bit.com>,
        Bryan Tan <bryantan@...are.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Ariel Levkovich <lariel@...dia.com>,
        "Theodore Ts'o" <tytso@....edu>, Julian Anastasov <ja@....bg>
Subject: Re: [PATCH 07/13] RDMA/rxe: Rename kfree_rcu() to kfree_rcu_mightsleep()

On Thu, Mar 9, 2023 at 10:13 PM Uladzislau Rezki <urezki@...il.com> wrote:
>
> > On Wed, Feb 01, 2023 at 04:08:13PM +0100, Uladzislau Rezki (Sony) wrote:
> > > The kfree_rcu()'s single argument name is deprecated therefore
> > > rename it to kfree_rcu_mightsleep() variant. The goal is explicitly
> > > underline that it is for sleepable contexts.
> > >
> > > Please check the RXE driver in a way that a single argument can
> > > be used. Briefly looking at it and rcu_head should be embed to
> > > free an obj over RCU-core. The context might be atomic.
> > >
> > > Cc: Bob Pearson <rpearsonhpe@...il.com>
> > > Cc: Jason Gunthorpe <jgg@...dia.com>
> > > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>

Thanks.
Acked-by: Zhu Yanjun <zyjzyj2000@...il.com>

Zhu Yanjun

> > > ---
> > >  drivers/infiniband/sw/rxe/rxe_pool.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > Could you please add you reviwed-by or Acked-by tags so we can bring
> > our series with renaming for the next merge window?
> >
> > Thanks!
> >
> __rxe_cleanup() can be called in two contexts, sleepable and not.
> Therefore usage of a single argument of the kvfree_rcu() is not correct
> here.
>
> Could you please fix and check your driver? If my above statement
> is not correct, please provide Acked-by or Reviwed-by tags to the
> path that is in question.
>
> Otherwise please add an rcu_head in your data to free objects over
> kvfree_rcu() using double argument API.
>
> Could you please support?
>
> --
> Uladzislau Rezki