RE: [PATCH] staging: comedi: cast to (unsigned int *)

David Laight
2021-02-19T09:09:03Z

> It's kind of moot anyway because the patch is outdated. But the reason
> for the ___force is that the same `struct comedi_cmd` is used in both
> user and kernel contexts. In user contexts, the `chanlist` member
> points to user memory and in kernel contexts it points to kernel memory
> (copied from userspace).

Can't you use a union of the user and kernel pointers?
(Possibly even anonymous?)
Although, ideally, keeping them in separate fields is better.
8 bytes for a pointer isn't going make a fat lot of difference.

David

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