linux-kernel - Re: [PATCH] RDMA/hfi1: Switch to kvfree

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Date:   Wed, 15 Dec 2021 21:51:58 +0100
From:   Uladzislau Rezki <urezki@...il.com>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     linux-rdma@...r.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Axtens <dja@...ens.net>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: Re: [PATCH] RDMA/hfi1: Switch to kvfree_rcu() API

On Wed, Dec 15, 2021 at 8:49 PM Jason Gunthorpe <jgg@...dia.com> wrote:
>
> On Wed, Dec 15, 2021 at 08:47:38PM +0100, Uladzislau Rezki wrote:
> > On Wed, Dec 15, 2021 at 12:18:44PM +0100, Uladzislau Rezki (Sony) wrote:
> > > Instead of invoking a synchronize_rcu() to free a pointer
> > > after a grace period we can directly make use of new API
> > > that does the same but in more efficient way.
> > >
> > > TO: linux-rdma@...r.kernel.org
> > > TO: Jason Gunthorpe <jgg@...dia.com>
> > > TO: Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
> > > Acked-by: Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
> > > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> > >  drivers/infiniband/hw/hfi1/sdma.c | 3 +--
> > >  1 file changed, 1 insertion(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/infiniband/hw/hfi1/sdma.c b/drivers/infiniband/hw/hfi1/sdma.c
> > > index f07d328689d3..7264a35e8f4c 100644
> > > +++ b/drivers/infiniband/hw/hfi1/sdma.c
> > > @@ -1292,8 +1292,7 @@ void sdma_clean(struct hfi1_devdata *dd, size_t num_engines)
> > >     sdma_map_free(rcu_access_pointer(dd->sdma_map));
> > >     RCU_INIT_POINTER(dd->sdma_map, NULL);
> > >     spin_unlock_irq(&dd->sde_map_lock);
> > > -   synchronize_rcu();
> > > -   kfree(dd->per_sdma);
> > > +   kvfree_rcu(dd->per_sdma);
> > >     dd->per_sdma = NULL;
> > >
> > >     if (dd->sdma_rht) {
> > + linux-rdma@...r.kernel.org
> > + Jason Gunthorpe <jgg@...dia.com>
> > + Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
>
> If it is not in the rdma patchworks it won't get applied..
>
> https://patchwork.kernel.org/project/linux-rdma/list/
>
Do you mean that i should:

Cc: <linux-rdma@...r.kernel.org>
Cc: Jason Gunthorpe <jgg@...dia.com>
Cc: Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>

instead?

Thanks!

-- 
Uladzislau Rezki