get_user_pages and pinning

[Rik van Riel]

On Sun, 2021-01-03 at 12:54 -0500, Sadanand Warrier wrote:
> 
> So the question is what should happen if the memory isn't actually
> allocated. Should get_user_pages check?
> It doesn't seem to be doing so.  Can it?

If the driver needs the memory to be allocated, why not
use the FOLL_POPULATE flag when calling get_user_pages?

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