linux-kernel - Re: Warning about init section reference in start

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Message-Id: <20070906131706.376af88b.randy.dunlap@oracle.com>
Date:	Thu, 6 Sep 2007 13:17:06 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	hpa@...or.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, sam@...nborg.org
Subject: Re: Warning about init section reference in start_kernel
 (2.6.23-rc4-mm1)

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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