linux-kernel - Re: [PATCH 02/16] device/dax: update devdax to use mmap

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Message-ID: <a97321dd-d8a4-4658-8894-14b854661d34@lucifer.local>
Date: Mon, 8 Sep 2025 16:28:36 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
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Subject: Re: [PATCH 02/16] device/dax: update devdax to use mmap_prepare

On Mon, Sep 08, 2025 at 05:03:54PM +0200, David Hildenbrand wrote:
> On 08.09.25 13:10, Lorenzo Stoakes wrote:
> > The devdax driver does nothing special in its f_op->mmap hook, so
> > straightforwardly update it to use the mmap_prepare hook instead.
> >
> > Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> > ---
> >   drivers/dax/device.c | 32 +++++++++++++++++++++-----------
> >   1 file changed, 21 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/dax/device.c b/drivers/dax/device.c
> > index 2bb40a6060af..c2181439f925 100644
> > --- a/drivers/dax/device.c
> > +++ b/drivers/dax/device.c
> > @@ -13,8 +13,9 @@
> >   #include "dax-private.h"
> >   #include "bus.h"
> > -static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
> > -		const char *func)
> > +static int __check_vma(struct dev_dax *dev_dax, vm_flags_t vm_flags,
> > +		       unsigned long start, unsigned long end, struct file *file,
> > +		       const char *func)
>
> In general
>
> Acked-by: David Hildenbrand <david@...hat.com>

Thanks!

>
> The only thing that bugs me is __check_vma() that does not check a vma.

Ah yeah, you're right.

>
> Maybe something along the lines of
>
> "check_vma_properties"

maybe check_vma_desc()?

>
> Not sure.
>
> --
> Cheers
>
> David / dhildenb
>

Cheers, Lorenzo