linux-kernel - Re: [PATCH 1/7] dynamic debug v2

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Date:	Wed, 13 Aug 2008 16:54:25 -0700
From:	Greg KH <greg@...ah.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, jbaron@...hat.com,
	randy.dunlap@...cle.com, linux-kernel@...r.kernel.org,
	joe@...ches.com, nick@...k-andrew.net
Subject: Re: [PATCH 1/7] dynamic debug v2 - infrastructure

On Wed, Aug 13, 2008 at 10:00:47PM +0200, Sam Ravnborg wrote:
> On Tue, Aug 12, 2008 at 08:38:59PM -0700, Greg KH wrote:
> > On Tue, Aug 12, 2008 at 06:16:53PM -0700, Andrew Morton wrote:
> > > On Tue, 12 Aug 2008 18:08:04 -0700
> > > Greg KH <greg@...ah.com> wrote:
> > > 
> > > > On Tue, Aug 12, 2008 at 04:46:19PM -0400, Jason Baron wrote:
> > > > > On Tue, Aug 12, 2008 at 01:09:08PM -0700, Greg KH wrote:
> > > > > > So close, can I have a good changelog comment with the patch so people
> > > > > > know what it is when they look in the logs?
> > > > > > 
> > > > > > Care to resend it with that?
> > > > > > 
> > > > > 
> > > > > Base infrastructure to enable per-module debug messages.
> > > > 
> > > > Ah, so close...
> > > > 
> > > > With this patch, I get the following build error:
> > > > 
> > > >   CC [M]  drivers/usb/gadget/u_ether.o
> > > > drivers/usb/gadget/u_ether.c: In function ___gether_setup___:
> > > > drivers/usb/gadget/u_ether.c:787: error: ___KBUILD_MODNAME___ undeclared (first use in this function)
> > > > drivers/usb/gadget/u_ether.c:787: error: (Each undeclared identifier is reported only once
> > > > drivers/usb/gadget/u_ether.c:787: error: for each function it appears in.)
> > > > drivers/usb/gadget/u_ether.c:787: error: unknown field ___Usage___ specified in initializer
> > > > drivers/usb/gadget/u_ether.c:787: error: expected expression before ___.___ token
> > > > drivers/usb/gadget/u_ether.c:787: error: initializer element is not constant
> > > > drivers/usb/gadget/u_ether.c:787: error: (near initialization for ___descriptor.hash___)
> > > > drivers/usb/gadget/u_ether.c:787: error: ___Usage___ undeclared (first use in this function)
> > > > drivers/usb/gadget/u_ether.c:787: error: invalid operands to binary << (have ___long long int___ and ___char *___)
> > > > drivers/usb/gadget/u_ether.c:787: error: expected ___)___ before ___:___ token
> > > > drivers/usb/gadget/u_ether.c:787: error: invalid operands to binary & (have ___long long int___ and ___char *___)
> > > > drivers/usb/gadget/u_ether.c:787: error: invalid operands to binary << (have ___long long int___ and ___char *___)
> > > > drivers/usb/gadget/u_ether.c:787: error: expected ___)___ before ___:___ token
> > > > drivers/usb/gadget/u_ether.c:787: error: invalid operands to binary & (have ___long long int___ and ___char *___)
> > > > drivers/usb/gadget/u_ether.c:787: error: expected ___)___ before ___:___ token
> > > > drivers/usb/gadget/u_ether.c:787: warning: passing argument 4 of _____dynamic_dbg_enabled_helper___ makes integer from pointer without a cast
> > > > drivers/usb/gadget/u_ether.c:787: error: expected ___)___ before ___KBUILD_MODNAME___
> > > 
> > > (lol at gcc crap)
> > > 
> > > > drivers/usb/gadget/u_ether.c:787: warning: too few arguments for format
> > > 
> > > argh, not that again.  We had this with a patch from Jesse a while
> > > back, which I fixed thusly:
> > 
> > <patch moving KBUILD_MODNAME from a inline function to a macro snipped>
> > 
> > Yeah, I remember that too, but in this case, KBUILD_MODNAME is being
> > used in a macro, not an inline function, the exact opposite.
> > 
> > Sam, any ideas here?  I'll bounce the original patch at you if you
> > missed it last time.
> 
> I have not looked into the particular error but what happens is
> that u_ether.o is used by more than one module so kbuild does
> not know what value to assign the KBUILD_MODNAME and therefore
> decide not to assign KBUILD_MODNAME at all.

Ick.

Hm, how do I fix this?  Build u_ether.c into two different .o files,
depending on which module it is being included into?

Or do:
	#include "u_ether.c"
in the source code that was linking it in?

Actually, as ugly as that last one is, it probably would solve this
issue, and be the same end-result, right?

thanks,

greg k-h
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