netdev - Re: [PATCH] vhost-vdpa: Remove usage of the deprecated ida_simple

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Date: Sun, 14 Apr 2024 05:09:38 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, kvm@...r.kernel.org,
	virtualization@...ts.linux.dev, netdev@...r.kernel.org
Subject: Re: [PATCH] vhost-vdpa: Remove usage of the deprecated
 ida_simple_xx() API

On Sun, Apr 14, 2024 at 10:59:06AM +0200, Christophe JAILLET wrote:
> Le 14/04/2024 à 10:35, Michael S. Tsirkin a écrit :
> > On Mon, Jan 15, 2024 at 09:35:50PM +0100, Christophe JAILLET wrote:
> > > ida_alloc() and ida_free() should be preferred to the deprecated
> > > ida_simple_get() and ida_simple_remove().
> > > 
> > > Note that the upper limit of ida_simple_get() is exclusive, buInputt the one of
> > 
> > What's buInputt? But?
> 
> Yes, sorry. It is "but".
> 
> Let me know if I should send a v2, or if it can be fixed when it is applied.
> 
> CJ

Yes it's easier if you do. Thanks!

> > 
> > > ida_alloc_max() is inclusive. So a -1 has been added when needed.
> > > 
> > > Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> > 
> > 
> > Jason, wanna ack?
> > 
> > > ---
> > >   drivers/vhost/vdpa.c | 6 +++---
> > >   1 file changed, 3 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> > > index bc4a51e4638b..849b9d2dd51f 100644
> > > --- a/drivers/vhost/vdpa.c
> > > +++ b/drivers/vhost/vdpa.c
> > > @@ -1534,7 +1534,7 @@ static void vhost_vdpa_release_dev(struct device *device)
> > >   	struct vhost_vdpa *v =
> > >   	       container_of(device, struct vhost_vdpa, dev);
> > > -	ida_simple_remove(&vhost_vdpa_ida, v->minor);
> > > +	ida_free(&vhost_vdpa_ida, v->minor);
> > >   	kfree(v->vqs);
> > >   	kfree(v);
> > >   }
> > > @@ -1557,8 +1557,8 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
> > >   	if (!v)
> > >   		return -ENOMEM;
> > > -	minor = ida_simple_get(&vhost_vdpa_ida, 0,
> > > -			       VHOST_VDPA_DEV_MAX, GFP_KERNEL);
> > > +	minor = ida_alloc_max(&vhost_vdpa_ida, VHOST_VDPA_DEV_MAX - 1,
> > > +			      GFP_KERNEL);
> > >   	if (minor < 0) {
> > >   		kfree(v);
> > >   		return minor;
> > > -- 
> > > 2.43.0
> > 
> > 
> >