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

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Message-ID: <ZAnpdKV/VvvX0TZz@pc636>
Date:   Thu, 9 Mar 2023 15:13:08 +0100
From:   Uladzislau Rezki <urezki@...il.com>
To:     Zhu Yanjun <zyjzyj2000@...il.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>, linux-rdma@...r.kernel.org
Cc:     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 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>
> > ---
> >  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