linux-kernel - Re: Section conflicts with percpu variables

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Date:	Fri, 29 Oct 2010 07:16:02 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Tejun Heo <tj@...nel.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Xen-devel@...ts.xensource.com" <Xen-devel@...ts.xensource.com>,
	Teck Choon Giam <giamteckchoon@...il.com>
Subject: Re: Section conflicts with percpu variables

 On 10/28/2010 02:21 AM, Tejun Heo wrote:
> On 10/27/2010 09:05 PM, Jeremy Fitzhardinge wrote:
>>  Hi Tejun,
>>
>> I wonder if you could have a look at this.  I have someone reporting
>> compilation failures when using the stock Centos 5 compiler:
>>
>> arch/x86/xen/mmu.c:163: error: __pcpu_scope_xen_cr3 causes a section type conflict
>> arch/x86/xen/mmu.c:164: error: __pcpu_scope_xen_current_cr3 causes a section type conflict
>> arch/x86/xen/mmu.c:163: error: __pcpu_unique_xen_cr3 causes a section type conflict
>> arch/x86/xen/mmu.c:164: error: __pcpu_unique_xen_current_cr3 causes a section type conflict
>>
>> Looking at mmu.i, I can't see why it is picking on these particular
>> per-cpu variables.  Do you have any insight into this.
> Hmmm... me neither.  section type conflict?  Does it make any
> different if you move the definitions near the top of the file or use
> a different compiler version?

This is the first report of this kind I've seen, so it mostly works. 
The compiler in question is the stock Centos 5 (.1?) compiler, so it
would be nice to make sure it works as-is.

I've seen section type conflicts with .discard before when discarding a
function and a data type with the same section, which is why I added
general support for .discard.* so they can all get their own sections. 
But that doesn't seem to be the case here.

    J
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