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

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Message-ID: <20080813200047.GA2053@uranus.ravnborg.org>
Date:	Wed, 13 Aug 2008 22:00:47 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Greg KH <greg@...ah.com>
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 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.

And because any usage of KBUILD_MODNAME is anyway flawed in u_ether.c
as we do not know for what module it is being used it makes sense for
kbuild to do so.

The above error happens because u_ether.c uses something that require KBUILD_MODNAME
to be define.
So the correct fix is to avid usage of this macro in the source.

Note: The old error Andrew mentions was caused by alpha indirectly
pulling in a inline function that used KBUILD_MODNAME - something
that did not happen on the other architectures.

	Sam
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