Subject: Re: [BUG]x86: relocatable doesn't work with new binutils
From: Shaohua Li <shaohua.li@intel.com>
To: =?ISO-8859-1?Q?Am=E9rico?= Wang <xiyou.wangcong@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, lkml <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Lu, Hongjiu" <hongjiu.lu@intel.com>,
        "Huang, Ying" <ying.huang@intel.com>
In-Reply-To: <20101217100559.GB8413@cr0.nay.redhat.com>
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	 <20101217100559.GB8413@cr0.nay.redhat.com>
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Date: Fri, 17 Dec 2010 22:06:13 +0800
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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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