debugging enabled? (was Re: KGDB command line options not working for kernel 2.6.32)

[Prabhu nath]

Hi Mulyadi/Spiro,

           Can you please help me in partially enabling/disabling
optimizations, because I was consistently hitting at the below problem when
building the kernel after disabling the optimization

ERROR: "intel_gmbus_is_forced_bit" [drivers/gpu/drm/i915/i915.ko] undefined!
ERROR: "__udivdi3" [drivers/gpu/drm/i915/i915.ko] undefined!
make[2]: *** [__modpost] Error 1
make[1]: *** [modules] Error 2
make: *** [sub-make] Error 2

Can I enable optimization for this i915 driver, so that I can contine with
my kernel building ?

Thanks,
Prabhu


On Tue, Jun 28, 2011 at 7:21 AM, Mulyadi Santosa
<mulyadi.santosa at gmail.com>wrote:

> Hi Spiro
>
> On Tue, Jun 28, 2011 at 01:40, Spiro Trikaliotis
> <ml-kernelnewbies at spiro.trikaliotis.net> wrote:
> >
> > On the other hand: With optimisations disabled, the kernel behaves
> > differently than it would with optimisations. That's why many people
> > prefer to keep them switched on, and only disable them partially if
> > really, really needed.
>
> I agree...even I still have mixed conclusion whether to go or no go
> with -O when dealing with -O and debugging. I guess one of the biggest
> offenders are: inlining, dead code (and symbols) elimination,
> substitution with specific machine specific opcode (not really sure,
> is -march has relationship with -O)...
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>
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