linux-kernel - Re: [PATCH 2/2] powerpc/vdso32: link vdso64 with linker

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Message-ID: <0c895acf-b6d7-baaf-d613-236f8be8e1fe@csgroup.eu>
Date:   Wed, 2 Sep 2020 17:43:03 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Segher Boessenkool <segher@...nel.crashing.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Fangrui Song <maskray@...gle.com>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/2] powerpc/vdso32: link vdso64 with linker

Hi,

Le 02/09/2020 à 16:14, Segher Boessenkool a écrit :
> Hi!
> 
> On Wed, Sep 02, 2020 at 06:46:45AM +0000, Christophe Leroy wrote:
>> ld crashes:
>>
>>    LD      arch/powerpc/kernel/vdso32/vdso32.so.dbg
>> /bin/sh: line 1: 23780 Segmentation fault      (core dumped)
>> ppc-linux-ld -EB -m elf32ppc -shared -soname linux-vdso32.so.1
>> --eh-frame-hdr --orphan-handling=warn -T
>> arch/powerpc/kernel/vdso32/vdso32.lds
>> arch/powerpc/kernel/vdso32/sigtramp.o
>> arch/powerpc/kernel/vdso32/gettimeofday.o
>> arch/powerpc/kernel/vdso32/datapage.o
>> arch/powerpc/kernel/vdso32/cacheflush.o
>> arch/powerpc/kernel/vdso32/note.o arch/powerpc/kernel/vdso32/getcpu.o -o
>> arch/powerpc/kernel/vdso32/vdso32.so.dbg
>> make[4]: *** [arch/powerpc/kernel/vdso32/vdso32.so.dbg] Error 139
>>
>>
>> [root@...alhost linux-powerpc]# ppc-linux-ld --version
>> GNU ld (GNU Binutils) 2.26.20160125
> 
> [ Don't build as root :-P ]
> 
> Try with a newer ld?  If it still happens with current versions, please
> open a bug report?  https://sourceware.org/bugzilla

Yes it works with 2.30 and 2.34
But minimum for building kernel is supposed to be 2.23

Christophe