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

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Date:	Tue, 12 Aug 2008 18:16:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Greg KH <greg@...ah.com>
Cc:	jbaron@...hat.com, randy.dunlap@...cle.com,
	linux-kernel@...r.kernel.org, joe@...ches.com,
	nick@...k-andrew.net, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH 1/7] dynamic debug v2 - infrastructure

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:

From: Andrew Morton <akpm@...ux-foundation.org>

alpha:

CC [M]  drivers/usb/gadget/u_ether.o
In file included from include/asm/dma-mapping.h:7,
                 from include/linux/dma-mapping.h:52,
                 from include/linux/dmaengine.h:29,
                 from include/linux/skbuff.h:29,
                 from include/linux/if_ether.h:114,
                 from include/linux/etherdevice.h:27,
                 from drivers/usb/gadget/u_ether.c:29:
include/linux/pci.h: In function 'pci_register_driver':
include/linux/pci.h:673: error: 'KBUILD_MODNAME' undeclared (first use in this function)
include/linux/pci.h:673: error: (Each undeclared identifier is reported only once
include/linux/pci.h:673: error: for each function it appears in.)


Sam says:

The problem is that u_ether.o is used by two modules so when we build it
KBUILD_MODNAME is not defined because kbuild does not know what value to
use.

And in pci.h we have the following inline:

static inline int __must_check pci_register_driver(struct pci_driver *driver)
{
        return __pci_register_driver(driver, THIS_MODULE, KBUILD_MODNAME);
}

And alpha uses dma-mapping.h to nullify a number of functions that seem to
require something from pci.h.

Making it a macro seems to fix this.

Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: Greg KH <greg@...ah.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 include/linux/pci.h |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff -puN include/linux/pci.h~pci-make-pci_register_driver-a-macro include/linux/pci.h
--- a/include/linux/pci.h~pci-make-pci_register_driver-a-macro
+++ a/include/linux/pci.h
@@ -680,10 +680,12 @@ void pci_enable_bridges(struct pci_bus *
 /* Proper probing supporting hot-pluggable devices */
 int __must_check __pci_register_driver(struct pci_driver *, struct module *,
 				       const char *mod_name);
-static inline int __must_check pci_register_driver(struct pci_driver *driver)
-{
-	return __pci_register_driver(driver, THIS_MODULE, KBUILD_MODNAME);
-}
+
+/*
+ * pci_register_driver must be a macro so that KBUILD_MODNAME can be expanded
+ */
+#define pci_register_driver(driver)		\
+	__pci_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
 
 void pci_unregister_driver(struct pci_driver *dev);
 void pci_remove_behind_bridge(struct pci_dev *dev);
_

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