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

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Date:   Thu, 27 Aug 2020 00:58:26 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        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

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.

cheers