linux-kernel - Re: [PATCH] x86: usb debug port early console v2

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Date:	Wed, 23 Jul 2008 17:06:46 -0700
From:	Greg KH <greg@...ah.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Arjan van de Ven <arjan@...radead.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: usb debug port early console v2

On Wed, Jul 23, 2008 at 04:46:36PM -0700, Yinghai Lu wrote:
> On Wed, Jul 23, 2008 at 4:21 PM, Greg KH <greg@...ah.com> wrote:
> > On Wed, Jul 23, 2008 at 03:54:09PM -0700, Yinghai Lu wrote:
> >> On Wed, Jul 23, 2008 at 3:45 PM, Greg KH <greg@...ah.com> wrote:
> >> > On Wed, Jul 23, 2008 at 02:00:53PM -0700, Yinghai Lu wrote:
> >> >> --- linux-2.6.orig/drivers/usb/host/ehci.h
> >> >> +++ linux-2.6/drivers/usb/host/ehci.h
> >> >
> >> > I don't understand the issue of any of these #ifdefs here.  Why are they
> >> > needed?
> >>
> >> In file included from arch/x86/kernel/early_printk.c:19:
> >> arch/x86/kernel/../../../drivers/usb/host/ehci.h:109: error: field
> >> 'iaa_watchdog' has incomplete type
> >
> > Ah, so you are papering over the real problem here, right?
> >
> > Why not just include the properly needed #includes either where you are
> > including this header file, or add the dependancies to the ehci.h file
> > itself (which is usually preferred.)
> 
> how about moving
> 
> struct ehci_caps;
> struct ehci_regs;
> struct ehci_dbg_port;
> 
> to one header file in include/usb
> so could use
> #include <linux/usb/ehci_def.h>
> instead of
> #include "../../../drivers/usb/host/ehci.h"

Sure, feel free to do that instead, that makes more sense.

> >> > And shouldn't there be a separate config option for early printk through
> >> > the ehci debug port?
> >>
> >> under usb or processor?
> >
> > Somewhere.
> >
> > Also, usb patches should be cc:ed to the linux-usb mailing list.  I'm
> > sure the EHCI authors would like to comment on this patch...
> 
> oh, i thought you wrote the ehci code.

Heh, no.

thanks,

greg k-h
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