linux-kernel - Re: USB mass storage and ARM cache coherency

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Date:	Tue, 2 Feb 2010 20:15:52 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Ming Lei <tom.leiming@...il.com>, linux-usb@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Sebastian Siewior <bigeasy@...utronix.de>,
	Greg KH <greg@...ah.com>
Subject: Re: USB mass storage and ARM cache coherency

On Tue, Feb 02, 2010 at 11:05:39AM +0000, Catalin Marinas wrote:
> On Tue, 2010-02-02 at 06:39 +0000, Paul Mundt wrote:
> > On Mon, Feb 01, 2010 at 05:29:14PM +0000, Catalin Marinas wrote:
> > > diff --git a/drivers/usb/host/isp1760-hcd.c b/drivers/usb/host/isp1760-hcd.c
> > > index 27b8f7c..4d3eeee 100644
> > > --- a/drivers/usb/host/isp1760-hcd.c
> > > +++ b/drivers/usb/host/isp1760-hcd.c
> > > @@ -18,6 +18,8 @@
> > >  #include <linux/uaccess.h>
> > >  #include <linux/io.h>
> > >  #include <asm/unaligned.h>
> > > +#include <asm/cacheflush.h>
> > > +#include <asm/memory.h>
> > 
> > asm/memory.h isn't a portable header. If you are including it for
> > virt_to_page(), linux/io.h should already bring that in via asm/io.h.
> > If arm doesn't bring in virt_to_page() through its asm/io.h, then fix the
> > headers there please.
> 
> In the ARM case, yes, it brings virt_to_page() but I'm not sure that's
> the case for the other architectures. I think a better header is
> linux/mm.h which already uses this function in virt_to_head_page().
> 
For some reason I was thinking virt_to_phys() instead of virt_to_page()
when I wrote that, so just ignore me. linux/mm.h is obviously fine.
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