linux-kernel - Re: [PATCH v2 06/14] net/mlx5: Rename kfree_rcu() to kfree_rcu

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Message-ID: <ZCGxk5k2yRGg3o33@x130>
Date:   Mon, 27 Mar 2023 08:09:07 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Boris Pismenny <borisp@...dia.com>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        Ariel Levkovich <lariel@...dia.com>,
        Vlad Buslov <vladbu@...dia.com>,
        "Paul E . McKenney" <paulmck@...nel.org>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/14] net/mlx5: Rename kfree_rcu() to
 kfree_rcu_mightsleep()

On 26 Mar 08:34, Joel Fernandes wrote:
>On Wed, Mar 15, 2023 at 2:19 PM Joel Fernandes (Google)
><joel@...lfernandes.org> wrote:
>>
>> From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
>>
>> The kfree_rcu() and kvfree_rcu() macros' single-argument forms are
>> deprecated.  Therefore switch to the new kfree_rcu_mightsleep() and
>> kvfree_rcu_mightsleep() variants. 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.
>
>In a world where patches anxiously await their precious Ack, could
>today be our lucky day on this one?
>
>We need Acks to take this in for 6.4. David? Others?
>

For mlx5 usually me, but since this is a larger series that is not mlx5
centric and targeting multiple tree, I really don't know which subsystem
you should be targeting.. for netdev submissions you need to specify the
targeted branch e.g. [PATCH v2 net-next 06/14] ... 


FWIW:

Reviewed-by: Saeed Mahameed <saeedm@...dia.com>


> - Joel
>
>
>>
>> Cc: Ariel Levkovich <lariel@...dia.com>
>> Cc: Saeed Mahameed <saeedm@...dia.com>
>> Cc: Vlad Buslov <vladbu@...dia.com>
>> 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/net/ethernet/mellanox/mlx5/core/en/tc/int_port.c  | 2 +-
>>  drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c | 4 ++--
>>  2 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/int_port.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/int_port.c
>> index ca834bbcb44f..8afcec0c5d3c 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/int_port.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/int_port.c
>> @@ -242,7 +242,7 @@ mlx5e_int_port_remove(struct mlx5e_tc_int_port_priv *priv,
>>                 mlx5_del_flow_rules(int_port->rx_rule);
>>         mapping_remove(ctx, int_port->mapping);
>>         mlx5e_int_port_metadata_free(priv, int_port->match_metadata);
>> -       kfree_rcu(int_port);
>> +       kfree_rcu_mightsleep(int_port);
>>         priv->num_ports--;
>>  }
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
>> index 08d0929e8260..b811dad7370a 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
>> @@ -670,7 +670,7 @@ static int mlx5e_macsec_del_txsa(struct macsec_context *ctx)
>>
>>         mlx5e_macsec_cleanup_sa(macsec, tx_sa, true);
>>         mlx5_destroy_encryption_key(macsec->mdev, tx_sa->enc_key_id);
>> -       kfree_rcu(tx_sa);
>> +       kfree_rcu_mightsleep(tx_sa);
>>         macsec_device->tx_sa[assoc_num] = NULL;
>>
>>  out:
>> @@ -849,7 +849,7 @@ static void macsec_del_rxsc_ctx(struct mlx5e_macsec *macsec, struct mlx5e_macsec
>>         xa_erase(&macsec->sc_xarray, rx_sc->sc_xarray_element->fs_id);
>>         metadata_dst_free(rx_sc->md_dst);
>>         kfree(rx_sc->sc_xarray_element);
>> -       kfree_rcu(rx_sc);
>> +       kfree_rcu_mightsleep(rx_sc);
>>  }
>>
>>  static int mlx5e_macsec_del_rxsc(struct macsec_context *ctx)
>> --
>> 2.40.0.rc1.284.g88254d51c5-goog
>>