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Message-ID: <20250920234836.GA3857420@ax162>
Date: Sat, 20 Sep 2025 16:48:36 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Huacai Chen <chenhuacai@...ngson.cn>
Cc: Huacai Chen <chenhuacai@...nel.org>, 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,
stable@...r.kernel.org, Binbin Zhou <zhoubinbin@...ngson.cn>,
Xi Ruoyao <xry111@...111.site>
Subject: Re: [PATCH V2] LoongArch: Align ACPI structures if ARCH_STRICT_ALIGN
enabled
Hi Huacai,
On Wed, Sep 10, 2025 at 05:10:33PM +0800, Huacai Chen wrote:
> 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 */
I am seeing several ACPI errors in my QEMU testing after this change in
Linus's tree as commit a9d13433fe17 ("LoongArch: Align ACPI structures
if ARCH_STRICT_ALIGN enabled").
$ make -skj"$(nproc)" ARCH=loongarch CROSS_COMPILE=loongarch64-linux- clean defconfig vmlinuz.efi
kernel/sched/fair.o: warning: objtool: sched_update_scaling() falls through to next function init_entity_runnable_average()
mm/mempolicy.o: warning: objtool: alloc_pages_bulk_mempolicy_noprof+0x380: stack state mismatch: reg1[30]=-1+0 reg2[30]=-2-80
lib/crypto/mpi/mpih-div.o: warning: objtool: mpihelp_divrem+0x2d0: stack state mismatch: reg1[22]=-1+0 reg2[22]=-2-16
In file included from include/acpi/acpi.h:24,
from drivers/acpi/acpica/tbprint.c:10:
drivers/acpi/acpica/tbprint.c: In function 'acpi_tb_print_table_header':
include/acpi/actypes.h:530:43: warning: 'strncmp' argument 1 declared attribute 'nonstring' is smaller than the specified bound 8 [-Wstringop-overread]
530 | #define ACPI_VALIDATE_RSDP_SIG(a) (!strncmp (ACPI_CAST_PTR (char, (a)), ACPI_SIG_RSDP, (sizeof(a) < 8) ? ACPI_NAMESEG_SIZE : 8))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/acpi/acpica/tbprint.c:105:20: note: in expansion of macro 'ACPI_VALIDATE_RSDP_SIG'
105 | } else if (ACPI_VALIDATE_RSDP_SIG(ACPI_CAST_PTR(struct acpi_table_rsdp,
| ^~~~~~~~~~~~~~~~~~~~~~
In file included from include/acpi/acpi.h:26:
include/acpi/actbl.h:69:14: note: argument 'signature' declared here
69 | char signature[ACPI_NAMESEG_SIZE] ACPI_NONSTRING; /* ASCII table signature */
| ^~~~~~~~~
$ curl -LSso /tmp/loongarch-QEMU_EFI.fd https://github.com/loongson/Firmware/raw/main/LoongArchVirtMachine/QEMU_EFI.fd
$ curl -LSs https://github.com/ClangBuiltLinux/boot-utils/releases/download/20241120-044434/loongarch-rootfs.cpio.zst | zstd -d >/tmp/rootfs.cpio
$ sha256sum /tmp/loongarch-QEMU_EFI.fd /tmp/rootfs.cpio
b375639ebcf7a873d2cab67f0c9c1c6c208fc3f1bcba4083172fa20c4fb7e1ab /tmp/loongarch-QEMU_EFI.fd
1c17c9a4ea823931446fca5f5323b8e9384ba88b48d679e394ec5d4f6e258793 /tmp/rootfs.cpio
$ qemu-system-loongarch64 --version | head -1
QEMU emulator version 10.1.0 (qemu-10.1.0-8.fc44)
# Filtered by "ACPI" and "Linux version"
$ qemu-system-loongarch64 \
-display none \
-nodefaults \
-M virt \
-cpu la464 \
-bios /tmp/loongarch-QEMU_EFI.fd \
-no-reboot \
-append console=ttyS0,115200 \
-kernel arch/loongarch/boot/vmlinuz.efi \
-initrd /tmp/rootfs.cpio \
-m 2G \
-smp 2 \
-serial mon:stdio
[ 0.000000] Linux version 6.17.0-rc6+ (nathan@...p) (loongarch64-linux-gcc (GCC) 15.2.0, GNU ld (GNU Binutils) 2.45) #1 SMP PREEMPT_DYNAMIC Sat Sep 20 16:24:42 MST 2025
[ 0.000000] efi: SMBIOS=0xf3c0000 SMBIOS 3.0=0xdd50000 MEMATTR=0xe832118 ACPI=0xe12f000 ACPI 2.0=0xe12f014 INITRD=0xe125f18 MEMRESERVE=0xe125f98 MEMMAP=0xe122018
[ 0.000000] ACPI: Early table checksum verification disabled
[ 0.000000] ACPI: RSDP 0x000000000E12F014 000024 (v02 BOCHS )
[ 0.000000] ACPI: XSDT 0x000000000E12E0E8 000054 (v01 BOCHS BXPC 00000001 01000013)
[ 0.000000] ACPI: FACP 0x000000000E12B000 00010C (v05 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: DSDT 0x000000000E12C000 00125D (v01 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: FACS 0x000000000C770000 000040
[ 0.000000] ACPI: APIC 0x000000000E12A000 00007B (v01 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: PPTT 0x000000000E129000 000074 (v02 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: SRAT 0x000000000E128000 0000A0 (v01 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: SPCR 0x000000000E127000 000050 (v02 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: MCFG 0x000000000E126000 00003C (v01 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: SPCR: console: uart,mmio,0x1fe001e0,115200
[ 0.000000] ACPI: SRAT: Node 0 PXM 0 [mem 0x00000000-0x0fffffff]
[ 0.000000] ACPI: SRAT: Node 0 PXM 0 [mem 0x80000000-0xefffffff]
[ 0.014877] ACPI: Core revision 20250404
[ 0.854788] ACPI: Added _OSI(Module Device)
[ 0.854920] ACPI: Added _OSI(Processor Device)
[ 0.854935] ACPI: Added _OSI(Processor Aggregator Device)
[ 0.885597] ACPI: 1 ACPI AML tables successfully acquired and loaded
[ 0.906695] ACPI: Interpreter enabled
[ 0.910327] ACPI: PM: (supports S0 S5)
[ 0.910495] ACPI: Using LPIC for interrupt routing
[ 0.911650] ACPI: MCFG table detected, 1 entries
[ 0.925560] ACPI Error: AE_AML_ALIGNMENT, Returned by Handler for [SystemMemory] (20250404/evregion-301)
[ 0.928083] ACPI Error: Aborting method \_SB.CPUS.CSTA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.930036] ACPI Error: Aborting method \_SB.CPUS.C000._STA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.930585] ACPI Error: Method execution failed \_SB.CPUS.C000._STA due to previous error (AE_AML_ALIGNMENT) (20250404/uteval-68)
[ 0.931693] ACPI Error: AE_AML_ALIGNMENT, Returned by Handler for [SystemMemory] (20250404/evregion-301)
[ 0.931878] ACPI Error: Aborting method \_SB.CPUS.CSTA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.932035] ACPI Error: Aborting method \_SB.CPUS.C001._STA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.932171] ACPI Error: Method execution failed \_SB.CPUS.C001._STA due to previous error (AE_AML_ALIGNMENT) (20250404/uteval-68)
[ 0.969018] ACPI Error: AE_AML_ALIGNMENT, Returned by Handler for [SystemMemory] (20250404/evregion-301)
[ 0.969139] ACPI Error: Aborting method \_SB.CPUS.CSTA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.969238] ACPI Error: Aborting method \_SB.CPUS.C000._STA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.971203] ACPI Error: AE_AML_ALIGNMENT, Returned by Handler for [SystemMemory] (20250404/evregion-301)
[ 0.971307] ACPI Error: Aborting method \_SB.CPUS.CSTA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.971399] ACPI Error: Aborting method \_SB.CPUS.C001._STA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.992513] ACPI Error: AE_AML_ALIGNMENT, Returned by Handler for [SystemMemory] (20250404/evregion-301)
[ 0.992762] ACPI Error: Aborting method \_SB.CPUS.CSTA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.993027] ACPI Error: Aborting method \_SB.CPUS.C000._STA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.993511] ACPI Error: AE_AML_ALIGNMENT, Returned by Handler for [SystemMemory] (20250404/evregion-301)
[ 0.993593] ACPI Error: Aborting method \_SB.CPUS.CSTA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.993664] ACPI Error: Aborting method \_SB.CPUS.C001._STA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 0.994569] ACPI: PCI: Interrupt link L000 configured for IRQ 80
[ 0.994887] ACPI: PCI: Interrupt link L001 configured for IRQ 81
[ 0.995038] ACPI: PCI: Interrupt link L002 configured for IRQ 82
[ 0.995167] ACPI: PCI: Interrupt link L003 configured for IRQ 83
[ 0.998540] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-7f])
[ 1.009539] ACPI: Remapped I/O 0x0000000018004000 to [io 0x0000-0xbfff window]
[ 1.039462] ACPI: bus type USB registered
[ 1.125150] pnp: PnP ACPI init
[ 1.135025] ACPI Error: AE_AML_ALIGNMENT, Returned by Handler for [SystemMemory] (20250404/evregion-301)
[ 1.135162] ACPI Error: Aborting method \_SB.CPUS.CSTA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 1.135433] ACPI Error: Aborting method \_SB.CPUS.C000._STA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 1.135539] ACPI Error: Method execution failed \_SB.CPUS.C000._STA due to previous error (AE_AML_ALIGNMENT) (20250404/uteval-68)
[ 1.136219] ACPI Error: AE_AML_ALIGNMENT, Returned by Handler for [SystemMemory] (20250404/evregion-301)
[ 1.136328] ACPI Error: Aborting method \_SB.CPUS.CSTA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 1.136426] ACPI Error: Aborting method \_SB.CPUS.C001._STA due to previous error (AE_AML_ALIGNMENT) (20250404/psparse-529)
[ 1.136516] ACPI Error: Method execution failed \_SB.CPUS.C001._STA due to previous error (AE_AML_ALIGNMENT) (20250404/uteval-68)
[ 1.144655] pnp: PnP ACPI: found 5 devices
[ 1.316259] ACPI: bus type thunderbolt registered
[ 1.441002] ACPI: button: Power Button [PWRB]
[ 1.719602] ACPI: bus type drm_connector registered
[ 8.642000] ACPI: PM: Preparing to enter system sleep state S5
At the parent change, this is all I see for ACPI messages.
[ 0.000000] efi: SMBIOS=0xf3c0000 SMBIOS 3.0=0xdd50000 MEMATTR=0xe832118 ACPI=0xe12f000 ACPI 2.0=0xe12f014 INITRD=0xe125f18 MEMRESERVE=0xe125f98 MEMMAP=0xe122018
[ 0.000000] ACPI: Early table checksum verification disabled
[ 0.000000] ACPI: RSDP 0x000000000E12F014 000024 (v02 BOCHS )
[ 0.000000] ACPI: XSDT 0x000000000E12E0E8 000054 (v01 BOCHS BXPC 00000001 01000013)
[ 0.000000] ACPI: FACP 0x000000000E12B000 00010C (v05 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: DSDT 0x000000000E12C000 00125D (v01 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: FACS 0x000000000C770000 000040
[ 0.000000] ACPI: APIC 0x000000000E12A000 00007B (v01 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: PPTT 0x000000000E129000 000074 (v02 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: SRAT 0x000000000E128000 0000A0 (v01 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: SPCR 0x000000000E127000 000050 (v02 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: MCFG 0x000000000E126000 00003C (v01 BOCHS BXPC 00000001 BXPC 00000001)
[ 0.000000] ACPI: SPCR: console: uart,mmio,0x1fe001e0,115200
[ 0.000000] ACPI: SRAT: Node 0 PXM 0 [mem 0x00000000-0x0fffffff]
[ 0.000000] ACPI: SRAT: Node 0 PXM 0 [mem 0x80000000-0xefffffff]
[ 0.014597] ACPI: Core revision 20250404
[ 0.915706] ACPI: Added _OSI(Module Device)
[ 0.915755] ACPI: Added _OSI(Processor Device)
[ 0.915764] ACPI: Added _OSI(Processor Aggregator Device)
[ 0.945135] ACPI: 1 ACPI AML tables successfully acquired and loaded
[ 0.960197] ACPI: Interpreter enabled
[ 0.961985] ACPI: PM: (supports S0 S5)
[ 0.962069] ACPI: Using LPIC for interrupt routing
[ 0.962718] ACPI: MCFG table detected, 1 entries
[ 1.013706] ACPI: PCI: Interrupt link L000 configured for IRQ 80
[ 1.013966] ACPI: PCI: Interrupt link L001 configured for IRQ 81
[ 1.014076] ACPI: PCI: Interrupt link L002 configured for IRQ 82
[ 1.014176] ACPI: PCI: Interrupt link L003 configured for IRQ 83
[ 1.014977] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-7f])
[ 1.022475] ACPI: Remapped I/O 0x0000000018004000 to [io 0x0000-0xbfff window]
[ 1.058781] ACPI: bus type USB registered
[ 1.125533] pnp: PnP ACPI init
[ 1.140430] pnp: PnP ACPI: found 5 devices
[ 1.270053] ACPI: bus type thunderbolt registered
[ 1.382724] ACPI: button: Power Button [PWRB]
[ 1.673533] ACPI: bus type drm_connector registered
[ 8.715507] ACPI: PM: Preparing to enter system sleep state S5
Is this expected?
Cheers,
Nathan
# bad: [3b08f56fbbb9ef75c7454487f8d3db80a84deef7] Merge tag 'x86-urgent-2025-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
# good: [f83ec76bf285bea5727f478a68b894f5543ca76e] Linux 6.17-rc6
git bisect start '3b08f56fbbb9ef75c7454487f8d3db80a84deef7' 'v6.17-rc6'
# good: [cbf658dd09419f1ef9de11b9604e950bdd5c170b] Merge tag 'net-6.17-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
git bisect good cbf658dd09419f1ef9de11b9604e950bdd5c170b
# good: [e8442d5b7bc6338d553040f5b1f7bd43f5ab30e0] Merge tag 'sound-6.17-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect good e8442d5b7bc6338d553040f5b1f7bd43f5ab30e0
# bad: [ffa7119cd1294dc1814e582dc07ffeb953ae7b26] Merge tag 'mmc-v6.17-rc2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
git bisect bad ffa7119cd1294dc1814e582dc07ffeb953ae7b26
# bad: [8dc5245673cf7f33743e5c0d2a4207c0b8df3067] LoongArch: KVM: Avoid copy_*_user() with lock hold in kvm_pch_pic_regs_access()
git bisect bad 8dc5245673cf7f33743e5c0d2a4207c0b8df3067
# bad: [d6d69f0edde63b553345d4efaceb7daed89fe04c] LoongArch: Replace sprintf() with sysfs_emit()
git bisect bad d6d69f0edde63b553345d4efaceb7daed89fe04c
# good: [74f8295c6fb8436bec9995baf6ba463151b6fb68] LoongArch: Handle jump tables options for RUST
git bisect good 74f8295c6fb8436bec9995baf6ba463151b6fb68
# bad: [a9d13433fe17be0e867e51e71a1acd2731fbef8d] LoongArch: Align ACPI structures if ARCH_STRICT_ALIGN enabled
git bisect bad a9d13433fe17be0e867e51e71a1acd2731fbef8d
# good: [f5003098e2f337d8e8a87dc636250e3fa978d9ad] LoongArch: Update help info of ARCH_STRICT_ALIGN
git bisect good f5003098e2f337d8e8a87dc636250e3fa978d9ad
# first bad commit: [a9d13433fe17be0e867e51e71a1acd2731fbef8d] LoongArch: Align ACPI structures if ARCH_STRICT_ALIGN enabled
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