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

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Date:   Tue, 23 Aug 2016 11:02:01 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Mikko Rapeli <mikko.rapeli@....fi>
Cc:     linux-kernel@...r.kernel.org,
        David Vrabel <david.vrabel@...rix.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        xen-devel@...ts.xenproject.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v05 54/72] include/uapi/xen/privcmd.h: fix compilation in
 userspace

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@...rix.com> on lkml message
> <5569F9C9.8000607@...rix.com>.
> 
> 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.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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