linux-kernel - Re: Detecting section mismatches in vmlinux

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Message-Id: <20070226.004838.126574842.anemo@mba.ocn.ne.jp>
Date:	Mon, 26 Feb 2007 00:48:38 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	sam@...nborg.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Detecting section mismatches in vmlinux

On Sun, 25 Feb 2007 00:25:27 +0100, Sam Ravnborg <sam@...nborg.org> wrote:
> Attached patch does:
> 1) Do not check vmlinux but check all .o files that is used to create vmlinux
> 2) Teach modpost to skip non-elf files (.a files and empty .o files etc)
> 
> With this change we get proper check of vmlinux (or files used to create vmlinux)

Thanks!  It works fine for me too.

> This gives following errors in a x86_64 defconfig build:
> 
> WARNING: init/built-in.o - Section mismatch: reference to .init.text:init from .text between 'rest_init' (at offset 0xe) and 'run_init_process'

This is because rest_init() (non __init) references 'init' (__init) as
an argument of kernel_thread().  No idea how to avoid this warning...

> WARNING: mm/built-in.o - Section mismatch: reference to .init.data:initkmem_list3 from .text between 'set_up_list3s' (at offset 0x1e6fb) and 'slab_get_obj'
> WARNING: mm/built-in.o - Section mismatch: reference to .init.data:initkmem_list3 from .text between 'set_up_list3s' (at offset 0x1e71c) and 'slab_get_obj'

This is because set_up_list3s() (non __init) references
initkmem_list3[] (__initdata).  The set_up_list3s() is only used on
early stage so can be __init, but it cause an another mismatch ---
setup_cpu_cache() (non __init) calls __init function.  Some trick
using a function pointer might solve this issue, but I wonder it is a
right thing to do...

Or we need another whitelist for vmlinux?

---
Atsushi Nemoto
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