linux-kernel - Re: Patch "i386: Relocatable kernel support" causes instant reboot

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Message-ID: <20061227040022.GA6699@in.ibm.com>
Date:	Wed, 27 Dec 2006 09:30:22 +0530
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	Segher Boessenkool <segher@...nel.crashing.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jean Delvare <khali@...ux-fr.org>, Andi Kleen <ak@...e.de>,
	Alexander van Heukelum <heukelum@...tmail.fm>
Subject: Re: Patch "i386: Relocatable kernel support" causes instant reboot

On Tue, Dec 26, 2006 at 01:43:31PM +0100, Segher Boessenkool wrote:
> >Thanks Jean. Your compressed/head.o looks fine.
> 
> No it doesn't -- the .text.head section doesn't have
> the ALLOC attribute set.  The section then ends up not
> being assigned to an output segment (during the linking
> of vmlinux) and all hell breaks loose.  The linker gives
> you a warning about this btw.
> 

Thanks Segher. You are right. I did not notice that.

Section Headers:
  [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
  [ 0]                   NULL            00000000 000000 000000 00      0   0  0
  [ 1] .text             PROGBITS        00000000 000034 000044 00  AX  0   0  4
  [ 2] .rel.text         REL             00000000 0005c8 000040 08      8   1  4
  [ 3] .data             PROGBITS        00000000 000078 000000 00  WA  0   0  4
  [ 4] .bss              NOBITS          00000000 000078 001000 00  WA  0   0  4
  [ 5] .text.head        PROGBITS        00000000 000078 00006e 00      0   0  1

.text.head is not type AX so it will be left out from the linked output.
This reminds me that I have put another patch in kernel/head.S creating
a new section .text.head. I think I shall have to put a patch there too
to make it work with older binutils.

Thanks
Vivek
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