linux-kernel - Re: [PATCH v2] x86: export 'pcibios

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Date:	Wed, 21 Mar 2012 09:29:50 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Wang YanQing <udknight@...il.com>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Michal Januszewski <spock@...too.org>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	linux-fbdev@...r.kernel.org, x86@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com
Subject: Re: [PATCH v2] x86: export 'pcibios_enabled' as GPL

On Wed, 21 Mar 2012 12:37:21 +0800
Wang YanQing <udknight@...il.com> wrote:

> On Sun, Mar 18, 2012 at 06:03:41PM -0700, Randy Dunlap wrote:
> > From: Randy Dunlap <rdunlap@...otime.net>
> > 
> > Export 'pcibios_enabled' so that when uvesafb is built as a
> > loadable module (on X86_32), the build will succeed.
> > 
> > ERROR: "pcibios_enabled" [drivers/video/uvesafb.ko] undefined!
> > 
> > Patch v2 uses EXPORT_SYMBOL_GPL() as requested.
> > 
> > Signed-off-by: Randy Dunlap <rdunlap@...otime.net>
> > Cc:	Michal Januszewski <spock@...too.org>
> > Cc:	Florian Tobias Schandinat <FlorianSchandinat@....de>
> > Cc:	linux-fbdev@...r.kernel.org
> > Cc:	x86@...nel.org
> > ---
> >  arch/x86/pci/pcbios.c |    1 +
> >  1 file changed, 1 insertion(+)
> > 
> > --- linux-next-20120313.orig/arch/x86/pci/pcbios.c
> > +++ linux-next-20120313/arch/x86/pci/pcbios.c
> > @@ -27,6 +27,7 @@
> >  #define PCIBIOS_HW_TYPE2_SPEC		0x20
> >  
> >  int pcibios_enabled;
> > +EXPORT_SYMBOL_GPL(pcibios_enabled);
> >  
> >  /* According to the BIOS specification at:
> >   * http://members.datafast.net.au/dft0802/specs/bios21.pdf, we could
> Acked-by: Wang YanQing <udknight@...il.com>

NAKked again by Alan Cox <alan@...ux.intel.com>

The fb code shouldn't be playing guessing games with thsi variable.
I've pointed out both how to check if NX is enabled and how to set pages
NX/non-NX.

Even if you wanted to check the pci bios state we should export a helper
method.

So NAK.

Alan
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