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LoongArch: Align ACPI structures if ARCH_STRICT_ALIGN enabled

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commit a9d13433fe17be0e867e51e71a1acd2731fbef8d upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huacai Chen 2025-09-18 19:44:01 +08:00 committed by Greg Kroah-Hartman
parent 83ca7939cc
commit e481c2fd34
1 changed files with 3 additions and 4 deletions
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7
arch/loongarch/include/asm/acenv.h
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@ -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 */