linux-kernel - Re: [tip:x86/x32] x32: Drop non-__vdso weak symbols from the x32 VDSO

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Message-ID: <4F464EF4.80902@zytor.com>
Date:	Thu, 23 Feb 2012 06:36:36 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-tip-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com, luto@....edu, tglx@...utronix.de,
	hjl.tools@...il.com
Subject: Re: [tip:x86/x32] x32: Drop non-__vdso weak symbols from the x32
 VDSO

On 02/23/2012 02:55 AM, Ingo Molnar wrote:
> 
> * tip-bot for H. Peter Anvin <hpa@...or.com> wrote:
> 
>> Commit-ID:  862ae3132dc393ab6ea750b9ee9e0e1c276b9abb
>> Gitweb:     http://git.kernel.org/tip/862ae3132dc393ab6ea750b9ee9e0e1c276b9abb
>> Author:     H. Peter Anvin <hpa@...or.com>
>> AuthorDate: Wed, 22 Feb 2012 20:37:10 -0800
>> Committer:  H. Peter Anvin <hpa@...or.com>
>> CommitDate: Wed, 22 Feb 2012 20:40:07 -0800
>>
>> x32: Drop non-__vdso weak symbols from the x32 VDSO
> 
> One of the recent x32 commit broke the build on some configs:
> 
>   VDSO    arch/x86/vdso/vdsox32.so.dbg
> /usr/bin/ld: arch/x86/vdso/vgetcpu-x32.o: relocation R_X86_64_64 
> against symbol `.rodata' isn't supported in x32 mode
> arch/x86/vdso/vgetcpu-x32.o: could not read symbols: Bad value
> collect2: error: ld returned 1 exit status
> 
> config attached.
> 
> binutils-2.21.51, gcc-4.7.0.
> 
> Thanks,
> 
> 	Ingo

Yes, this is known: binutils-2.21.51 has some x32 support, but that
version of the ABI is too old for what the kernel needs; in other words
it's not functional.

	-hpa

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