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[79.180.2.31]) by smtp.gmail.com with ESMTPSA id bx24sm731233ejc.88.2021.03.01.07.33.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Mar 2021 07:33:18 -0800 (PST) Date: Mon, 1 Mar 2021 10:33:14 -0500 From: "Michael S. Tsirkin" To: Jason Wang Cc: Eli Cohen , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Subject: Re: [PATCH] vdpa/mlx5: Fix wrong use of bit numbers Message-ID: <20210301103214-mutt-send-email-mst@kernel.org> References: <20210301062817.39331-1-elic@nvidia.com> <959916f2-5fc9-bdb4-31ca-632fe0d98979@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <959916f2-5fc9-bdb4-31ca-632fe0d98979@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 01, 2021 at 03:52:45PM +0800, Jason Wang wrote: > > On 2021/3/1 2:28 下午, Eli Cohen wrote: > > VIRTIO_F_VERSION_1 is a bit number. Use BIT_ULL() with mask > > conditionals. > > > > Also, in mlx5_vdpa_is_little_endian() use BIT_ULL for consistency with > > the rest of the code. > > > > Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices") > > Signed-off-by: Eli Cohen > > > Acked-by: Jason Wang And CC stable I guess? > > > --- > > drivers/vdpa/mlx5/net/mlx5_vnet.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c > > index dc7031132fff..7d21b857a94a 100644 > > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c > > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c > > @@ -821,7 +821,7 @@ static int create_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtque > > MLX5_SET(virtio_q, vq_ctx, event_qpn_or_msix, mvq->fwqp.mqp.qpn); > > MLX5_SET(virtio_q, vq_ctx, queue_size, mvq->num_ent); > > MLX5_SET(virtio_q, vq_ctx, virtio_version_1_0, > > - !!(ndev->mvdev.actual_features & VIRTIO_F_VERSION_1)); > > + !!(ndev->mvdev.actual_features & BIT_ULL(VIRTIO_F_VERSION_1))); > > MLX5_SET64(virtio_q, vq_ctx, desc_addr, mvq->desc_addr); > > MLX5_SET64(virtio_q, vq_ctx, used_addr, mvq->device_addr); > > MLX5_SET64(virtio_q, vq_ctx, available_addr, mvq->driver_addr); > > @@ -1578,7 +1578,7 @@ static void teardown_virtqueues(struct mlx5_vdpa_net *ndev) > > static inline bool mlx5_vdpa_is_little_endian(struct mlx5_vdpa_dev *mvdev) > > { > > return virtio_legacy_is_little_endian() || > > - (mvdev->actual_features & (1ULL << VIRTIO_F_VERSION_1)); > > + (mvdev->actual_features & BIT_ULL(VIRTIO_F_VERSION_1)); > > } > > static __virtio16 cpu_to_mlx5vdpa16(struct mlx5_vdpa_dev *mvdev, u16 val)