linux-kernel - [PATCH] lib/Kconfig.debug: add ARCH dependency for FUNCTION

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Date:   Thu,  3 Mar 2022 16:20:48 +0800
From:   Feng Tang <feng.tang@...el.com>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kernel test robot <lkp@...el.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Feng Tang <feng.tang@...el.com>, Guo Ren <guoren@...nel.org>
Subject: [PATCH] lib/Kconfig.debug: add ARCH dependency for FUNCTION_ALIGN option

0Day robots reported there is compiling issue for 'csky' ARCH
when CONFIG_DEBUG_FORCE_DATA_SECTION_ALIGNED is enabled [1]:

"
All errors (new ones prefixed by >>):

   {standard input}: Assembler messages:
>> {standard input}:2277: Error: pcrel offset for branch to .LS000B too far (0x3c)
"

Which has been discussed in [2]. And as there is no solution for csky
yet, add some dependency for this config to limit it to several ARCHs
which have no compiling issue so far.

[1]. https://lore.kernel.org/lkml/202202271612.W32UJAj2-lkp@intel.com/
[2]. https://www.spinics.net/lists/linux-kbuild/msg30298.html

Reported-by: kernel test robot <lkp@...el.com>
Cc: Guo Ren <guoren@...nel.org>
Signed-off-by: Feng Tang <feng.tang@...el.com>
---
 lib/Kconfig.debug | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index d6b5c94df099..a270a64e4429 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -401,8 +401,8 @@ config SECTION_MISMATCH_WARN_ONLY
 	  If unsure, say Y.
 
 config DEBUG_FORCE_FUNCTION_ALIGN_64B
-	bool "Force all function address 64B aligned" if EXPERT
-	depends on PPC || ARM || X86
+	bool "Force all function address 64B aligned"
+	depends on EXPERT && (X86_64 || ARM64 || PPC32 || PPC64 || ARC)
 	help
 	  There are cases that a commit from one domain changes the function
 	  address alignment of other domains, and cause magic performance
-- 
2.27.0