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Date:   Wed,  7 Apr 2021 10:35:43 -0700
Message-Id: <20210407173543.3598006-1-ndesaulniers@google.com>
Mime-Version: 1.0
Subject: [PATCH] MIPS: select ARCH_KEEP_MEMBLOCK unconditionally
From:   Nick Desaulniers <ndesaulniers@google.com>
To:     Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc:     Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Guenter Roeck <linux@roeck-us.net>, linux-mips@vger.kernel.org,
        linux-kernel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

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@kernel.org>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
 arch/mips/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index e9893cd34992..702648f60e41 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -12,7 +12,7 @@ config MIPS
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_HAS_UBSAN_SANITIZE_ALL
 	select ARCH_HAS_GCOV_PROFILE_ALL
-	select ARCH_KEEP_MEMBLOCK if DEBUG_KERNEL
+	select ARCH_KEEP_MEMBLOCK
 	select ARCH_SUPPORTS_UPROBES
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_CMPXCHG_LOCKREF if 64BIT
-- 
2.31.1.295.g9ea45b61b8-goog