checkpatch.pl should check UAPI headers don't #include <uapi/...>

[David Howells]

Hi Joe,

Can you make checkpatch.pl check that lines added to UAPI headers don't have
the form:

	#include <uapi/...>

or:

	#include "uapi/..."

Such as these should be regarded as errors as they will likely break userspace
which shouldn't get to see any uapi/ directories.

An example of this is in:

	commit 19bf7f8ac3f8131100027281c495dbbe00cd5ae0
	Merge: 787c57c 35fd3dc
	Author: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
	Date:   Mon Oct 29 19:15:32 2012 -0200

where during the conflict resolution, the following change was made:

	- #include <asm/epapr_hcalls.h>
	++#include <uapi/asm/epapr_hcalls.h>

I recognise that checkpatch.pl might not have helped in this case since it
isn't normally applied to merged as far as I know.

Thanks,
David
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