Hi Jiri, Geert,

On Wed, 15 Aug 2012 22:01:38 +0200, Jiri Slaby wrote:

On 08/04/2012 11:24 AM, Geert Uytterhoeven wrote:

quoted

Below is the list of build error/warning regressions/improvements in
v3.6-rc1[1] compared to v3.5[2].

...

quoted

  + drivers/i2c/busses/i2c-designware-core.c: error: 'KBUILD_MODNAME' undeclared (first use in this function):

This is a real problem we are facing here. It happens on PPC when all
I2C_DESIGNWARE_PLATFORM, I2C_DESIGNWARE_PCI and DYNAMIC_DEBUG are set.

It's because i2c-designware-core.c is used in two modules
(i2c-designware-platform and i2c-designware-pci) and KBUILD_MODNAME is
not defined for those because (scripts/Makefile.lib):
# $(modname_flags) #defines KBUILD_MODNAME as the name of the module
# it will end up in (or would, if it gets compiled in)
# Note: Files that end up in two or more modules are compiled
#       without the KBUILD_MODNAME definition. The reason is
#       that any made-up name would differ in different configs.

But DYNAMIC_DEBUG needs KBUILD_MODNAME for dev_dbg used in that source.

Any ideas? Why is it not a separate module for example?

It should be. Axel Lin has posted a patch which does that and it should
fix your problem:
https://lkml.org/lkml/2012/6/13/233

Please test and confirm it does the right thing. I'll push the patch
upstream if it does.

-- 
Jean Delvare