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@xxxxxxxxx> wrote:
Hi Spiro
I agree...even I still have mixed conclusion whether to go or no go
On Tue, Jun 28, 2011 at 01:40, Spiro Trikaliotis
<ml-kernelnewbies@xxxxxxxxxxxxxxxxxxxxx> 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.
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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