Hi Mauro,
On Monday 20 June 2011 16:05:39 Mauro Carvalho Chehab wrote:
> Em 20-06-2011 10:38, Laurent Pinchart escreveu:
> > On Monday 20 June 2011 14:50:28 Mauro Carvalho Chehab wrote:
> >> Em 20-06-2011 09:35, Laurent Pinchart escreveu:
> >>> On Sunday 19 June 2011 13:47:16 Mauro Carvalho Chehab wrote:
> >>>> Em 19-06-2011 02:00, Helmut Auer escreveu:
> >>>>> Am 18.06.2011 23:38, schrieb Oliver Endriss:
> >>>>>> On Saturday 18 June 2011 23:11:21 Helmut Auer wrote:
> >>>>>>> Hi
> >>>>>>>
> >>>>>>>> Replacing
> >>>>>>>>
> >>>>>>>> ifdef CONFIG_VIDEO_OMAP3_DEBUG
> >>>>>>>>
> >>>>>>>> by
> >>>>>>>>
> >>>>>>>> ifeq ($(CONFIG_VIDEO_OMAP3_DEBUG),y)
> >>>>>>>>
> >>>>>>>> would do the trick.
> >>>>>>>
> >>>>>>> I guess that would not ive the intended result.
> >>>>>>> Setting CONFIG_VIDEO_OMAP3_DEBUG to yes should not lead to debug
> >>>>>>> messages in all media modules,
> >>>>>>
> >>>>>> True, but it will happen only if you manually enable
> >>>>>> CONFIG_VIDEO_OMAP3_DEBUG in Kconfig.
> >>>>>>
> >>>>>> You cannot avoid this without major changes of the
> >>>>>> media_build system - imho not worth the effort.
> >>>>>
> >>>>> Then imho it would be better to drop the CONFIG_VIDEO_OMAP3_DEBUG
> >>>>> variable completely, you can set CONFIG_DEBUG which would give the
> >>>>> same results.
> >>>>
> >>>> Good catch!
> >>>>
> >>>> Yes, I agree that the better is to just drop CONFIG_VIDEO_OMAP3_DEBUG
> >>>> variable completely. If someone wants to build with -DDEBUG, he can
> >>>> just use CONFIG_DEBUG.
> >>>>
> >>>> Laurent,
> >>>>
> >>>> Any comments?
> >>>
> >>> CONFIG_VIDEO_OMAP3_DEBUG is used to build the OMAP3 ISP driver in debug
> >>> mode, without having to compile the whole kernel with debugging
> >>> enabled. I'd like to keep that feature if possible.
> >>
> >> If you want that, build it using media_build. I don't care of having
> >> such hacks there, but having it upstream is not the right thing to do.
> >
> > It's not a hack. Lots of drivers have debugging Kconfig options.
> >
> > $ find linux-2.6 -type f -name Kconfig* -exec grep '^config.*DEBUG' {} \;
> > | wc
> >
> > 243 486 5826
>
> Your query is wrong. The proper query is:
> $ find . -type f -name Makefile -exec grep -rH 'EXTRA_CFLAGS.*\-DDEBUG$' {}
> \; ./arch/x86/pci/Makefile:EXTRA_CFLAGS += -DDEBUG
> ./drivers/pps/generators/Makefile:EXTRA_CFLAGS += -DDEBUG
> ./drivers/media/video/omap3isp/Makefile:EXTRA_CFLAGS += -DDEBUG
>
> There's nothing wrong with a debug Kconfig option
> for omap3. What's wrong is:
>
> 1) It is badly implemented: it is just enabling -DDEBUG for the entire
> subsystem, as the test is wrong;
I'm fine with replacing 'ifdef CONFIG_VIDEO_OMAP3_DEBUG' with 'ifeq
($(CONFIG_VIDEO_OMAP3_DEBUG),y)'.
> 2) Even if you fix, you'll be enabling debug to the entire subsystem, if
> you keep adding things to EXTRA_CFLAGS.
That's the main issue. The Makefile has been designed for the kernel, where it
doesn't get merged in a single Makefile like media_build does. That's does a
media_build issue.
> It should be noticed that several places use a different syntax for
> enabling per-driver/per-subsystem -D flag:
>
> find . -type f -name Makefile -exec grep -rH '\-DDEBUG$' {} \;
> ...
> ./drivers/mmc/Makefile:subdir-ccflags-$(CONFIG_MMC_DEBUG) := -DDEBUG
> ...
> ./drivers/infiniband/hw/cxgb3/Makefile:ccflags-$(CONFIG_INFINIBAND_CXGB3_DE
> BUG) += -DDEBUG
>
> I _suspect_ that using ccflags-$(foo_DEBUG) may work.
I've seen that, but it doubt it will work better. v4l/Makefile.media will end
up containing
ccflags-$(CONFIG_VIDEO_OMAP3_DEBUG) += -DDEBUG
which will get expanded to
ccflags-y += -DDEBUG
All media_build drivers will thus be compiled with debugging enabled.
--
Regards,
Laurent Pinchart
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