Warning about init section reference in start_kernel (2.6.23-rc4-mm1)

Warning about init section reference in start_kernel (2.6.23-rc4-mm1)

[Mathieu Desnoyers]

Hi Peter,

I have seen the following warning on the recent -mm kernels when
compiling a i386 kernel:

  scripts/mod/modpost   -o /home/compudj/git/morestable/linux-2.6-lttng/Module.symvers    vmlinux.o
WARNING: vmlinux.o(.text.head+0x223): Section mismatch: reference to .init.text.1:start_kernel (between 'is386' and 'check_x87')

It looks like head.S jumps to start_kernel at the end of is386. Is this
ok and valid ? If yes, then I guess modpost should be updated.

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

Re: Warning about init section reference in start_kernel (2.6.23-rc4-mm1)

[Randy Dunlap]

On Thu, 6 Sep 2007 15:46:32 -0400 Mathieu Desnoyers wrote:

> Hi Peter,
> 
> I have seen the following warning on the recent -mm kernels when
> compiling a i386 kernel:
> 
>   scripts/mod/modpost   -o /home/compudj/git/morestable/linux-2.6-lttng/Module.symvers    vmlinux.o
> WARNING: vmlinux.o(.text.head+0x223): Section mismatch: reference to .init.text.1:start_kernel (between 'is386' and 'check_x87')
> 
> It looks like head.S jumps to start_kernel at the end of is386. Is this
> ok and valid ? If yes, then I guess modpost should be updated.

[added Sam]

This has come up several times.  Yes, it's OK.

If we could add __init_refok to is386 in head.S, this problem would
be fixed, but afaik we cannot do that.
Or modpost could have special knowledge of this one quirk, but that's
not desirable either.


---
~Randy
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