linux-kernel - Re: [2.6.30-rc8] gcc 3.3 : _

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Message-ID: <20090605023835.GA7933@cr0.nay.redhat.com>
Date:	Fri, 5 Jun 2009 10:38:35 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [2.6.30-rc8] gcc 3.3 : __udivdi3 undefined.

On Fri, Jun 05, 2009 at 09:38:04AM +0900, Tetsuo Handa wrote:
>[2.6.30-rc8] gcc 3.3 : __udivdi3 undefined.
>
>"make allmodconfig" + "CONFIG_KVM=n" on 2.6.30-rc8 triggers build failure
>when built with gcc 3.3.5 .
>
># make -s
>/usr/src/all/vanilla/src/linux-2.6.30-rc8/arch/x86/Makefile:82: stack protector enabled but no compiler support
>WARNING: modpost: Found 2 section mismatch(es).
>To see full details build your kernel with:
>'make CONFIG_DEBUG_SECTION_MISMATCH=y'
>arch/x86/mm/built-in.o(.init.text+0x43f7): In function `__change_page_attr':
>arch/x86/mm/pageattr.c:114: undefined reference to `__udivdi3'
>make: *** [.tmp_vmlinux1] Error 1
>

Probably you are compiling on i386?

Weird... 

All the types in __change_page_attr() are either 'long' or 'int', how
can gcc generate software divide for these integer operations?
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