linux-kernel - Re: [PATCH v1 4/9] powerpc/vdso: Remove unnecessary ifdefs in vdso

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Message-ID: <51cab2a3-044c-f76b-db3a-490ac7533cd2@csgroup.eu>
Date:   Wed, 26 Aug 2020 17:21:04 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v1 4/9] powerpc/vdso: Remove unnecessary ifdefs in
 vdso_pagelist initialization



Le 26/08/2020 à 16:58, Michael Ellerman a écrit :
> Christophe Leroy <christophe.leroy@...roup.eu> writes:
>> diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
>> index daef14a284a3..bbb69832fd46 100644
>> --- a/arch/powerpc/kernel/vdso.c
>> +++ b/arch/powerpc/kernel/vdso.c
>> @@ -718,16 +710,14 @@ static int __init vdso_init(void)
> ...
>>   
>> -
>> -#ifdef CONFIG_VDSO32
>>   	vdso32_kbase = &vdso32_start;
>>   
>>   	/*
>> @@ -735,8 +725,6 @@ static int __init vdso_init(void)
>>   	 */
>>   	vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
>>   	DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
>> -#endif
> 
> This didn't build for ppc64le:
> 
>    /opt/cross/gcc-8.20_binutils-2.32/powerpc64-unknown-linux-gnu/bin/powerpc64-unknown-linux-gnu-ld: arch/powerpc/kernel/vdso.o:(.toc+0x0): undefined reference to `vdso32_end'
>    /opt/cross/gcc-8.20_binutils-2.32/powerpc64-unknown-linux-gnu/bin/powerpc64-unknown-linux-gnu-ld: arch/powerpc/kernel/vdso.o:(.toc+0x8): undefined reference to `vdso32_start'
>    make[1]: *** [/scratch/michael/build/maint/Makefile:1166: vmlinux] Error 1
>    make: *** [Makefile:185: __sub-make] Error 2
> 
> So I just put that ifdef back.
> 

Argh. I guess that's the DBG() that hurts. I'll think about it.

Christophe