linux-kernel - [PATCH V2] LoongArch: Align ACPI structures if ARCH_STRICT

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Message-ID: <20250910091033.725716-1-chenhuacai@loongson.cn>
Date: Wed, 10 Sep 2025 17:10:33 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	Xuefeng Li <lixuefeng@...ngson.cn>,
	Guo Ren <guoren@...nel.org>,
	Xuerui Wang <kernel@...0n.name>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	linux-kernel@...r.kernel.org,
	Huacai Chen <chenhuacai@...ngson.cn>,
	stable@...r.kernel.org,
	Binbin Zhou <zhoubinbin@...ngson.cn>,
	Xi Ruoyao <xry111@...111.site>
Subject: [PATCH V2] LoongArch: Align ACPI structures if ARCH_STRICT_ALIGN enabled

ARCH_STRICT_ALIGN is used for hardware without UAL, now it only control
the -mstrict-align flag. However, ACPI structures are packed by default
so will cause unaligned accesses.

To avoid this, define ACPI_MISALIGNMENT_NOT_SUPPORTED in asm/acenv.h to
align ACPI structures if ARCH_STRICT_ALIGN enabled.

Cc: stable@...r.kernel.org
Reported-by: Binbin Zhou <zhoubinbin@...ngson.cn>
Suggested-by: Xi Ruoyao <xry111@...111.site>
Suggested-by: Jiaxun Yang <jiaxun.yang@...goat.com>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
V2: Modify asm/acenv.h instead of Makefile.

 arch/loongarch/include/asm/acenv.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/loongarch/include/asm/acenv.h b/arch/loongarch/include/asm/acenv.h
index 52f298f7293b..483c955f2ae5 100644
--- a/arch/loongarch/include/asm/acenv.h
+++ b/arch/loongarch/include/asm/acenv.h
@@ -10,9 +10,8 @@
 #ifndef _ASM_LOONGARCH_ACENV_H
 #define _ASM_LOONGARCH_ACENV_H
 
-/*
- * This header is required by ACPI core, but we have nothing to fill in
- * right now. Will be updated later when needed.
- */
+#ifdef CONFIG_ARCH_STRICT_ALIGN
+#define ACPI_MISALIGNMENT_NOT_SUPPORTED
+#endif /* CONFIG_ARCH_STRICT_ALIGN */
 
 #endif /* _ASM_LOONGARCH_ACENV_H */
-- 
2.47.3