[PATCH RFC 0/3] MAP_POPULATE for device memory

[Jarkko Sakkinen]

On Sun, Mar 06, 2022 at 11:48:26PM -0800, Christoph Hellwig wrote:
> On Sun, Mar 06, 2022 at 11:33:02AM +0000, Matthew Wilcox wrote:
> > On Sun, Mar 06, 2022 at 07:32:04AM +0200, Jarkko Sakkinen wrote:
> > > For device memory (aka VM_IO | VM_PFNMAP) MAP_POPULATE does nothing. Allow
> > > to use that for initializing the device memory by providing a new callback
> > > f_ops->populate() for the purpose.
> > 
> > As I said, NAK.
> 
> Agreed.  This is an amazingly bad interface.

So what would you suggest to sort out the issue? I'm happy to go with
ioctl if nothing else is acceptable.

BR, Jarkko