linux-kernel - Re: [PATCH -next] xen: fix header export to userspace

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Message-ID: <alpine.LSU.2.00.1011151017570.8553@hermes-2.csi.cam.ac.uk>
Date:	Mon, 15 Nov 2010 10:23:48 +0000
From:	Tony Finch <dot@...at.at>
To:	Randy Dunlap <randy.dunlap@...cle.com>
cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	akpm <akpm@...ux-foundation.org>, linux-next@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	xen-devel@...ts.xensource.com, virtualization@...ts.osdl.org
Subject: Re: [PATCH -next] xen: fix header export to userspace

On Sat, 13 Nov 2010, Randy Dunlap wrote:

> From: Randy Dunlap <randy.dunlap@...cle.com>
>
> scripts/headers_install.pl prevents "__user" from being exported
> to userspace headers, so just use compiler.h to make sure that
> __user is defined and avoid the error.
>
> unifdef: linux-next-20101112/xx64/usr/include/xen/privcmd.h.tmp: 79: Premature EOF (#if line 33 depth 1)

I suggest the following slightly more informative message

> scripts/headers_install.pl strips "__user" when exporting headers to
> userspace and can introduce a syntax error (detected by unifdef) if
> "__user" appears in an unexpected place. Simplify by using compiler.h to
> make sure that __user is defined and avoid the error.
>
> unifdef: linux-next-20101112/xx64/usr/include/xen/privcmd.h.tmp: 79: Premature EOF (#if line 33 depth 1)

In any case,

Acked-By:	Tony Finch <dot@...at.at>

Tony.
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