linux-kernel - Re: [PATCH] MIPS: vdso: Define BUILD_VDSO32 when building a 32bit kernel

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Message-ID: <20200116201114.44l7ou24ppz2jjjt@pburton-laptop>
Date:   Thu, 16 Jan 2020 12:11:14 -0800
From:   Paul Burton <paulburton@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        paul.burton@...s.com, luto@...nel.org,
        kbuild test robot <lkp@...el.com>
Subject: Re: [PATCH] MIPS: vdso: Define BUILD_VDSO32 when building a 32bit
 kernel

Hi Thomas,

On Thu, Jan 16, 2020 at 08:43:41PM +0100, Thomas Gleixner wrote:
> The confinement of the 32bit specific VDSO functions missed to define
> BUILD_VDSO32 when building a 32bit MIPS kernel:
> 
> arch/mips/vdso/vgettimeofday.c: In function ‘__vdso_clock_gettime’:
> arch/mips/vdso/vgettimeofday.c:17:9: error: implicit declaration of function ‘__cvdso_clock_gettime32’
> 
> arch/mips/vdso/vgettimeofday.c: In function ‘__vdso_clock_getres’:
> arch/mips/vdso/vgettimeofday.c:39:9: error: implicit declaration of function ‘__cvdso_clock_getres_time32’
> 
> Force the define for 32bit builds in the VDSO Makefile.
> 
> Fixes: bf279849ad59 ("lib/vdso: Build 32 bit specific functions in the right context")
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Presuming you want to take this through timers/core along with the patch
it fixes:

    Acked-by: Paul Burton <paulburton@...nel.org>

Thanks,
    Paul

> ---
>  arch/mips/vdso/Makefile |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> --- a/arch/mips/vdso/Makefile
> +++ b/arch/mips/vdso/Makefile
> @@ -18,6 +18,10 @@ ccflags-vdso := \
>  	$(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
>  	-D__VDSO__
>  
> +ifndef CONFIG_64BIT
> +ccflags-vdso += -DBUILD_VDSO32
> +endif
> +
>  ifdef CONFIG_CC_IS_CLANG
>  ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
>  endif