linux-kernel - Re: [PATCH 1/4] vdpa_sim: switch to use __vdpa_alloc

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Date:   Wed, 21 Dec 2022 14:29:33 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, eperezma@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] vdpa_sim: switch to use __vdpa_alloc_device()

On Wed, Dec 21, 2022 at 02:16:49PM +0800, Jason Wang wrote:
>This allows us to control the allocation size of the structure.
>
>Signed-off-by: Jason Wang <jasowang@...hat.com>
>---
> drivers/vdpa/vdpa_sim/vdpa_sim.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

>
>diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
>index b071f0d842fb..757afef86ba0 100644
>--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
>+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
>@@ -250,6 +250,7 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr,
> 			       const struct vdpa_dev_set_config *config)
> {
> 	const struct vdpa_config_ops *ops;
>+	struct vdpa_device *vdpa;
> 	struct vdpasim *vdpasim;
> 	struct device *dev;
> 	int i, ret = -ENOMEM;
>@@ -267,14 +268,16 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr,
> 	else
> 		ops = &vdpasim_config_ops;
>
>-	vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops,
>-				    dev_attr->ngroups, dev_attr->nas,
>-				    dev_attr->name, false);
>-	if (IS_ERR(vdpasim)) {
>-		ret = PTR_ERR(vdpasim);
>+	vdpa = __vdpa_alloc_device(NULL, ops,
>+				   dev_attr->ngroups, dev_attr->nas,
>+				   sizeof(struct vdpasim),
>+				   dev_attr->name, false);
>+	if (IS_ERR(vdpa)) {
>+		ret = PTR_ERR(vdpa);
> 		goto err_alloc;
> 	}
>
>+	vdpasim = vdpa_to_sim(vdpa);
> 	vdpasim->dev_attr = *dev_attr;
> 	INIT_WORK(&vdpasim->work, dev_attr->work_fn);
> 	spin_lock_init(&vdpasim->lock);
>-- 
>2.25.1
>