linux-kernel - Re: [PATCH v2 01/14] drbd: Rename kvfree_rcu() to kvfree_rcu

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Message-ID: <CAEXW_YQehT7Zj0G4nBj-0b+Ndq_FTxFzxQ-WYnBGJ=87wPBHYw@mail.gmail.com>
Date:   Sun, 26 Mar 2023 08:27:10 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Philipp Reisner <philipp.reisner@...bit.com>,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>, Jens Axboe <axboe@...nel.dk>
Cc:     "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        drbd-dev@...ts.linbit.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 01/14] drbd: Rename kvfree_rcu() to kvfree_rcu_mightsleep()

On Wed, Mar 15, 2023 at 2:19 PM Joel Fernandes (Google)
<joel@...lfernandes.org> wrote:
>
> From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
>
> The kvfree_rcu() macro's single-argument form is deprecated.  Therefore
> switch to the new kvfree_rcu_mightsleep() variant. The goal is to
> avoid accidental use of the single-argument forms, which can introduce
> functionality bugs in atomic contexts and latency bugs in non-atomic
> contexts.
>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Philipp Reisner <philipp.reisner@...bit.com>
> Cc: Lars Ellenberg <lars.ellenberg@...bit.com>

Jens/Others, any chance for an Ack here?

 - Joel

> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> ---
>  drivers/block/drbd/drbd_nl.c       | 6 +++---
>  drivers/block/drbd/drbd_receiver.c | 4 ++--
>  drivers/block/drbd/drbd_state.c    | 2 +-
>  3 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
> index 60757ac31701..f49f2a5282e1 100644
> --- a/drivers/block/drbd/drbd_nl.c
> +++ b/drivers/block/drbd/drbd_nl.c
> @@ -1615,7 +1615,7 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
>                         drbd_send_sync_param(peer_device);
>         }
>
> -       kvfree_rcu(old_disk_conf);
> +       kvfree_rcu_mightsleep(old_disk_conf);
>         kfree(old_plan);
>         mod_timer(&device->request_timer, jiffies + HZ);
>         goto success;
> @@ -2446,7 +2446,7 @@ int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
>
>         mutex_unlock(&connection->resource->conf_update);
>         mutex_unlock(&connection->data.mutex);
> -       kvfree_rcu(old_net_conf);
> +       kvfree_rcu_mightsleep(old_net_conf);
>
>         if (connection->cstate >= C_WF_REPORT_PARAMS) {
>                 struct drbd_peer_device *peer_device;
> @@ -2860,7 +2860,7 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
>                 new_disk_conf->disk_size = (sector_t)rs.resize_size;
>                 rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
>                 mutex_unlock(&device->resource->conf_update);
> -               kvfree_rcu(old_disk_conf);
> +               kvfree_rcu_mightsleep(old_disk_conf);
>                 new_disk_conf = NULL;
>         }
>
> diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
> index 757f4692b5bd..e197b2a465d2 100644
> --- a/drivers/block/drbd/drbd_receiver.c
> +++ b/drivers/block/drbd/drbd_receiver.c
> @@ -3759,7 +3759,7 @@ static int receive_protocol(struct drbd_connection *connection, struct packet_in
>                 drbd_info(connection, "peer data-integrity-alg: %s\n",
>                           integrity_alg[0] ? integrity_alg : "(none)");
>
> -       kvfree_rcu(old_net_conf);
> +       kvfree_rcu_mightsleep(old_net_conf);
>         return 0;
>
>  disconnect_rcu_unlock:
> @@ -4127,7 +4127,7 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info
>
>                         rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
>                         mutex_unlock(&connection->resource->conf_update);
> -                       kvfree_rcu(old_disk_conf);
> +                       kvfree_rcu_mightsleep(old_disk_conf);
>
>                         drbd_info(device, "Peer sets u_size to %lu sectors (old: %lu)\n",
>                                  (unsigned long)p_usize, (unsigned long)my_usize);
> diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
> index 75d13ea0024f..2aeea295fa28 100644
> --- a/drivers/block/drbd/drbd_state.c
> +++ b/drivers/block/drbd/drbd_state.c
> @@ -2071,7 +2071,7 @@ static int w_after_conn_state_ch(struct drbd_work *w, int unused)
>                 conn_free_crypto(connection);
>                 mutex_unlock(&connection->resource->conf_update);
>
> -               kvfree_rcu(old_conf);
> +               kvfree_rcu_mightsleep(old_conf);
>         }
>
>         if (ns_max.susp_fen) {
> --
> 2.40.0.rc1.284.g88254d51c5-goog
>