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:

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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