linux-kernel - Re: [PATCH] MIPS: select ARCH_KEEP

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Message-ID: <20210423121132.GE8582@alpha.franken.de>
Date:   Fri, 23 Apr 2021 14:11:32 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: select ARCH_KEEP_MEMBLOCK unconditionally

On Wed, Apr 07, 2021 at 10:35:43AM -0700, Nick Desaulniers wrote:
> While removing allnoconfig_y from Kconfig, ARCH=mips allnoconfig builds
> started failing with the error:
> 
> WARNING: modpost: vmlinux.o(.text+0x9c70): Section mismatch in reference
> from the function reserve_exception_space() to the function
> .meminit.text:memblock_reserve()
> The function reserve_exception_space() references the function __meminit
> memblock_reserve().
> This is often because reserve_exception_space lacks a __meminit
> annotation or the annotation of memblock_reserve is wrong.
> ERROR: modpost: Section mismatches detected.
> Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.
> 
> allnoconfig disables DEBUG_KERNEL and thus ARCH_KEEP_MEMBLOCK, which
> changes __init_memblock to be equivalent to __meminit triggering the
> above error.
> 
> Link: https://lore.kernel.org/linux-kbuild/20210313194836.372585-11-masahiroy@kernel.org/
> Fixes: commit a8c0f1c634507 ("MIPS: Select ARCH_KEEP_MEMBLOCK if
> DEBUG_KERNEL to enable sysfs memblock debug")
> Cc: Masahiro Yamada <masahiroy@...nel.org>
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  arch/mips/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

applied to mips-next. I've dropped the Fixes tag, because it doesn't
fix this commit. Sidenode wouldn't it make sence to make 
reserve_exception_space() as __meminit ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]