linux-kernel - RE: [PATCHv2 06/11] unicore32 core architecture: mm related: generic codes

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Date:	Tue, 22 Feb 2011 22:16:40 +0800
From:	"Guan Xuetao" <gxt@...c.pku.edu.cn>
To:	"'Arnd Bergmann'" <arnd@...db.de>
Cc:	<linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
	"'Greg KH'" <greg@...ah.com>
Subject: RE: [PATCHv2 06/11] unicore32 core architecture: mm related: generic codes



> -----Original Message-----
> From: Arnd Bergmann [mailto:arnd@...db.de]
> Sent: Friday, February 18, 2011 1:28 AM
> To: Guan Xuetao
> Cc: linux-kernel@...r.kernel.org; linux-arch@...r.kernel.org; 'Greg KH'
> Subject: Re: [PATCHv2 06/11] unicore32 core architecture: mm related: generic codes
> 
> On Sunday 13 February 2011, Guan Xuetao wrote:
> > This patch includes generic codes for memory management.
> >
> > Signed-off-by: Guan Xuetao <gxt@...c.pku.edu.cn>
> 
> Reviewed-by: Arnd Bergmann <arnd@...db.de>
> 
> > +#ifdef __io
> > +void __iomem *ioport_map(unsigned long port, unsigned int nr)
> > +{
> > +       /* we map PC lagcy 64K IO port to PCI IO space 0x80030000 */
> > +       return (void __iomem *) (unsigned long)
> > +                       io_p2v((port & 0xffff) + PKUNITY_PCILIO_BASE);
> > +}
> 
> Interestingly, this function looks completely correct, but I don't see
> the definition for __io, so I suspect that the function is not actually
> getting used.
When I want to use pci device driver,  I will define __io and use ioport_map for drivers.
It is obviously a trick. And with your patch for asm-generic/io.h, these codes could be removed.

> 
> Best make this unconditional. The code is obviously derived from the
> ARM version, which uses a macro called __io, but you don't need this
> macro because you only support one SoC platform.
> 
> 	Arnd

Thanks & Regards.
Guan Xuetao

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