linux-kernel - Re: [BUG]x86: relocatable doesn't work with new binutils

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Message-ID: <1292594773.1746.2.camel@shli-laptop>
Date:	Fri, 17 Dec 2010 22:06:13 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Lu, Hongjiu" <hongjiu.lu@...el.com>,
	"Huang, Ying" <ying.huang@...el.com>
Subject: Re: [BUG]x86: relocatable doesn't work with new binutils

On Fri, 2010-12-17 at 18:05 +0800, Américo Wang wrote:
> On Fri, Dec 17, 2010 at 11:21:54AM +0800, Shaohua Li wrote:
> >On Fri, 2010-12-17 at 10:59 +0800, H. Peter Anvin wrote:
> >> On 12/16/2010 06:42 PM, Shaohua Li wrote:
> >> > We can easily workaround this issue by moving jiffies to a section or at
> >> > least warn people if such binutils are using. what should we do?
> >> 
> >> I think we should do the workaround, but still get distros to update the
> >> broken binutils.
> >Here is my workaround.
> >The problem is a lot of kernel versions are affected by this, fix all?
> >
> >
> >
> >The CONFIG_RELOCATABLE is broken with new binutils, which will make boot
> >panic. According to Lu Hongjiu, the affected binutils are from
> >2.20.51.0.12 to 2.21.51.0.3, which are release since Oct 22 this year.
> >At least ubuntu 10.10 is using such binutils. see:
> >http://sourceware.org/bugzilla/show_bug.cgi?id=12327
> >The reason of boot panic is we have 'jiffies = jiffies_64;' in
> >vmlinux.lds.S. The jiffies isn't in any section. In kernel build, there
> >is warning saying jiffies is an absolute address and can't be
> >relocatable. At runtime, jiffies will have virtual address 0.
> >
> 
> Just curious, what change in binutils caused this?
I'm not familiar with binutils, please check the bugzilla.

>  And what build
> warning did you see? Section mismatch warning?
Something like this: WARNING: Absolute relocations present

Thanks,
Shaohua

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