From mboxrd@z Thu Jan  1 00:00:00 1970
From: gprabhunath@gmail.com (Prabhu nath)
Date: Tue, 28 Jun 2011 11:55:00 +0530
Subject: debugging enabled? (was Re: KGDB command line options not working
	for kernel 2.6.32)
In-Reply-To: <BANLkTi=B5BpS226h3P-Jm=Vqj=VMjWcq+w@mail.gmail.com>
References: <BANLkTi=ee7A-O-2LYuvCdFM_wfs7z2mgew@mail.gmail.com>
	<20110627184043.GC15361@trikaliotis.net>
	<BANLkTi=B5BpS226h3P-Jm=Vqj=VMjWcq+w@mail.gmail.com>
Message-ID: <BANLkTineCVLz-3+a98b9iT490u4RG6Satg@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

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@gmail.com>wrote:

> Hi Spiro
>
> On Tue, Jun 28, 2011 at 01:40, Spiro Trikaliotis
> <ml-kernelnewbies@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
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
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