Commit a9d13433 authored Sep 18, 2025 by Huacai Chen

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@vger.kernel.org
Reported-by: Binbin Zhou <zhoubinbin@loongson.cn>
Suggested-by: Xi Ruoyao <xry111@xry111.site>
Suggested-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

parent f5003098

arch/loongarch/include/asm/acenv.h

+3 −4

Original line number	Diff line number	Diff line
		@@ -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 */