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Re: [PATCH 00/13] UAPI header file split

Michael Kerrisk <mtk.manpages@xxxxxxxxx> wrote:

> >>
> >> Some of the resulting uapi header files are empty:
> >> ...
> >> I imagine this should be reasonably easy to fix.
> >
> > Fix how?  The Kbuild files say these headers must exist in UAPI space, but
> > the __KERNEL__ guards therein don't define any content for them in UAPI.
> I'm not sure of the answer here. It certainly seems odd to have a
> bunch of new empty header files in the kernel tree, which is why I
> commented on it. Without digging much deeper, I've no idea whether the
> Kbuild files can be (automatically?) modified not to require these
> empty files.

You can't get rid of the empty header files completely.  They're exported to
userspace and so userspace may require their presence.

I could put a guard in there just so they're not empty, I suppose.

> So, a manual fix may be in order?

Or just apply the removal regexp to each line before I write the UAPI header
out.  I'll have a play with it later.

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