linux-kernel - Re: [PATCH v2 2/8] lib: vdso: Build 32 bit specific functions in the right context

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Date:   Tue, 14 Jan 2020 10:33:50 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     catalin.marinas@....com, will@...nel.org, paul.burton@...s.com,
        salyzyn@...roid.com, 0x7f454c46@...il.com, luto@...nel.org
Subject: Re: [PATCH v2 2/8] lib: vdso: Build 32 bit specific functions in the right context

Thomas Gleixner <tglx@...utronix.de> writes:

> Vincenzo Frascino <vincenzo.frascino@....com> writes:
>
>> clock_gettime32 and clock_getres_time32 should be compiled only with a
>> 32 bit vdso library.
>>
>> Exclude these symbols when BUILD_VDSO32 is not defined.
>
> This breaks the ARM build with:
>
> arch/arm/vdso/vgettimeofday.c: In function ‘__vdso_clock_gettime’:
> arch/arm/vdso/vgettimeofday.c:15:9: error: implicit declaration of function ‘__cvdso_clock_gettime32’; did you mean ‘__cvdso_clock_gettime’? [-Werror=implicit-function-declaration]
>   return __cvdso_clock_gettime32(clock, ts);
>          ^~~~~~~~~~~~~~~~~~~~~~~
>          __cvdso_clock_gettime
> arch/arm/vdso/vgettimeofday.c: In function ‘__vdso_clock_getres’:
> arch/arm/vdso/vgettimeofday.c:33:9: error: implicit declaration of function ‘__cvdso_clock_getres_time32’; did you mean ‘__cvdso_clock_getres_common’? [-Werror=implicit-function-declaration]
>   return __cvdso_clock_getres_time32(clock_id, res);
>          ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>          __cvdso_clock_getres_common
> cc1: some warnings being treated as errors
>
> The patch below 'fixes' at least the build. Can someone please confirm
> the correctness?

Bah, it's not fixing it. That's what you get when you compile the wrong
tree...