Re: [PATCH v2] MIPS: do not compile generic functions for CONFIG_CAVIUM_OCTEON_SOC

[Thomas Bogendoerfer <tsbogend@alpha.franken.de>]

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@intel.com>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.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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