Re: [LTP] Fw: 2.6.9 & 2.6.11 kernel with gcov patch says modversions.h is missing

[Leann O. <oga...@os...>]

On Tue, 2006-05-16 at 07:59 -0500, Paul Larson wrote:
> 
> Forwarding this to the proper list 
> 
> ---
> Paul Larson
> Linux Technology Center
> IBM Corporation
> ph: (512) 838-9303 tl: 678-9303
> pl...@us... 
> ----- Forwarded by Paul Larson/Austin/IBM on 05/16/2006 07:56 AM
> ----- 
> 
> ltp...@li... wrote on 05/12/2006 01:50:03
> PM:
> 
> > I cannot compile the 2.6.9 or 2.6.11 kernel with the gcov patch.
>  Both
> > say that modversions.h is missing.  
> > 
> >      CC      drivers/gcov/gcov-proc.o
> >    /usr/src/kernels/linux-2.6.11/drivers/gcov/gcov-proc.c:31:31:
> > linux/modversions.h: No such file or directory
> >    make[2]: *** [drivers/gcov/gcov-proc.o] Error 1
> >    make[1]: *** [drivers/gcov] Error 2
> >    make: *** [drivers] Error 2
> > 
> > I don't do the kernel much and I just know enough to get into
> trouble so
> > forgive me if I say something completely idiotic.
> > 
> > On the 2.6.9, I can comment out the include for modversions.h and it
> > will compile but I will not the gcov files in /proc/gcov.  They
> > directory structure is there and there are a number of .tmp_...
> Files.
> > 
> > I can also point it to the other modversions.h that is located in
> > include/config/modversions.h which allows me to compile as well but
> I
> > receive a number of warnings
> > 
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/microcode.ko needs
> > unknown symbol __gcov_init
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/microcode.ko needs
> > unknown symbol __gcov_merge_add
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k8
> > .ko needs unknown symbol __gcov_init
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k8
> > .ko needs unknown symbol __gcov_merge_add
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-s
> > mi.ko needs unknown symbol __gcov_init
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-s
> > mi.ko needs unknown symbol __gcov_merge_add
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/cpu/cpufreq/p4-clockmod
> > .ko needs unknown symbol __gcov_init
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/cpu/cpufreq/p4-clockmod
> > .ko needs unknown symbol __gcov_merge_add
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k6
> > .ko needs unknown symbol __gcov_init
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k6
> > .ko needs unknown symbol __gcov_merge_add
> >    WARNING: /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/msr.ko
> > needs unknown symbol __gcov_init
> >    WARNING: /lib/modules/2.6.11-gcov/kernel/arch/i386/kernel/msr.ko
> > needs unknown symbol __gcov_merge_add
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/crypto/aes-i586.ko needs
> > unknown symbol __gcov_init
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/crypto/aes-i586.ko needs
> > unknown symbol __gcov_merge_add
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/oprofile/oprofile.ko needs
> > unknown symbol __gcov_init
> >    WARNING:
> > /lib/modules/2.6.11-gcov/kernel/arch/i386/oprofile/oprofile.ko needs
> > unknown symbol __gcov_merge_add
> > 
> > 
> > Any suggestions?

Hi Jason,

Just a few days ago I tried the linux-2.6.14-gcov.patch against the
2.6.14 kernel and ran into similar problems.  I had to edit some
Makefiles to get rid of those warnings.  I can kind of replicate your
warnings now by commenting out the "CFLAGS := $(CFLAGS_NOGCOV)" line in
my arch/i386/boot/compressed/Makefile

arch/i386/boot/compressed/misc.o: In function `global constructors keyed to stack_start_GCOV':
misc.c:(.text+0x3a5f): undefined reference to `__gcov_init'
arch/i386/boot/compressed/misc.o:(.data+0x184): undefined reference to `__gcov_merge_add'

To get rid of those warnings you are seeing, maybe try adding the
following line to the appropriate Makefiles where you are seeing those
warnings pop up:

CFLAGS := $(CFLAGS_NOGCOV)

After I had originally patched all the Makefiles to get rid of the
warnings like you are seeing, I eventually wound up updating my version
of gcc.  I updated to gcc-3.4.5.  I was running gcc-3.3.x and it didn't
seem to like that.  It appeared that ctors_start and ctors_end were not
getting set in kernel/module.c and as such my /proc/gcov directory would
never get populated.  Updating gcc seemed to fix that.

Once I did update my gcc, I unpacked a new 2.6.14 kernel and applied the
linux-2.6.14-gcov patch.  When I compiled this time, I had no warnings
at all and I never had to edit any Makefiles.   

Hope that helps,

Leann