linux-kernel - Re: [PATCH v2] MIPS: do not compile generic functions for CONFIG_CAVIUM_OCTEON

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Message-ID: <20200325173215.GC17524@alpha.franken.de>
Date:   Wed, 25 Mar 2020 18:32:15 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-mips@...r.kernel.org,
        "Maciej W . Rozycki" <macro@...ux-mips.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        Alexander Lobakin <alobakin@...nk.ru>,
        Paul Burton <paulburton@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] MIPS: do not compile generic functions for
 CONFIG_CAVIUM_OCTEON_SOC

On Wed, Mar 25, 2020 at 04:45:29PM +0900, Masahiro Yamada wrote:
> MIPS provides multiple definitions for the following functions:
> 
>   fw_init_cmdline
>   __delay
>   __udelay
>   __ndelay
>   memmove
>   __rmemcpy
>   memcpy
>   __copy_user
> 
> The generic ones are defined in lib-y objects, which are overridden by
> the Octeon ones when CONFIG_CAVIUM_OCTEON_SOC is enabled.
> 
> The use of EXPORT_SYMBOL in static libraries potentially causes a
> problem for the llvm linker [1]. So, I want to forcibly link lib-y
> objects to vmlinux when CONFIG_MODULES=y.
> 
> As a groundwork, we must fix multiple definitions that have previously
> been hidden by lib-y.
> 
> If you look at lib/string.c, arch can define __HAVE_ARCH_* to opt out
> the generic implementation.
> 
> Similarly, this commit adds CONFIG_HAVE_PLAT_* to allow a platform
> to opt out the MIPS generic code.
> 
> [1]: https://github.com/ClangBuiltLinux/linux/issues/515
> 
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
> Changes in v2:
>   - Use #ifdef instead of __weak. This avoids increasing image size.
> 
>  arch/mips/Kconfig          | 12 ++++++++++++
>  arch/mips/fw/lib/cmdline.c |  2 ++
>  arch/mips/lib/delay.c      |  4 ++++
>  arch/mips/lib/memcpy.S     |  3 +++
>  4 files changed, 21 insertions(+)

applied to mips-next.

Thomas.

-- 
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