Re: [PATCH RFC 0/3] MAP_POPULATE for device memory
From: Christoph Hellwig
Date: Mon Mar 07 2022 - 02:48:47 EST
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.