Re: [PATCH v05 54/72] include/uapi/xen/privcmd.h: fix compilation in userspace

[Russell King - ARM Linux]

On Mon, Aug 22, 2016 at 08:33:11PM +0200, Mikko Rapeli wrote:
> xen/interface/xen.h is not exported from kernel headers so remove the
> dependency and provide needed defines for domid_t and xen_pfn_t if they
> are not already defined by some other e.g. Xen specific headers.

I'm confused.  How did we end up with a 64-bit PFN number on ARM?  It's
insane - especially as the kernel uses "unsigned long" almost everywhere
for PFNs - we can't have physical addresses more than 44 bits (32 bit
pfn + 4k page size).

> Suggested by Andrew Cooper <andrew.cooper3@xxxxxxxxxx> on lkml message
> <5569F9C9.8000607@xxxxxxxxxx>.
> 
> The ifdef for ARM is ugly but did not find better solutions for it.

#ifdef __arm__

maybe?  Even if not, the unsightly parens are not necessary.

-- 
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