linux-kernel - [PATCH] acpica: Work around bogus -Wstringop-overread warning since GCC 11

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Message-ID: <20251021092825.822007-1-xry111@xry111.site>
Date: Tue, 21 Oct 2025 17:28:25 +0800
From: Xi Ruoyao <xry111@...111.site>
To: "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Cc: loongarch@...ts.linux.dev,
	Mingcong Bai <jeffbai@...c.io>,
	Guenter Roeck <linux@...ck-us.net>,
	Xi Ruoyao <xry111@...111.site>,
	stable@...r.kernel.org,
	Saket Dumbre <saket.dumbre@...el.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Robert Moore <robert.moore@...el.com>,
	Len Brown <lenb@...nel.org>,
	Huacai Chen <chenhuacai@...nel.org>,
	linux-acpi@...r.kernel.org (open list:ACPI COMPONENT ARCHITECTURE (ACPICA)),
	acpica-devel@...ts.linux.dev (open list:ACPI COMPONENT ARCHITECTURE (ACPICA)),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] acpica: Work around bogus -Wstringop-overread warning since GCC 11

When ACPI_MISALIGNMENT_NOT_SUPPORTED, GCC can produce a bogus
-Wstringop-overread warning, see https://gcc.gnu.org/PR122073.

To me it's very clear that we have a compiler bug here, thus just
disable the warning.

Cc: stable@...r.kernel.org
Fixes: a9d13433fe17 ("LoongArch: Align ACPI structures if ARCH_STRICT_ALIGN enabled")
Link: https://lore.kernel.org/all/899f2dec-e8b9-44f4-ab8d-001e160a2aed@roeck-us.net/
Link: https://github.com/acpica/acpica/commit/abf5b573
Co-developed-by: Saket Dumbre <saket.dumbre@...el.com>
Signed-off-by: Saket Dumbre <saket.dumbre@...el.com>
Signed-off-by: Xi Ruoyao <xry111@...111.site>
---
 drivers/acpi/acpica/tbprint.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/acpi/acpica/tbprint.c b/drivers/acpi/acpica/tbprint.c
index 049f6c2f1e32..e5631027f7f1 100644
--- a/drivers/acpi/acpica/tbprint.c
+++ b/drivers/acpi/acpica/tbprint.c
@@ -95,6 +95,11 @@ acpi_tb_print_table_header(acpi_physical_address address,
 {
 	struct acpi_table_header local_header;
 
+#pragma GCC diagnostic push
+#if defined(__GNUC__) && __GNUC__ >= 11
+#pragma GCC diagnostic ignored "-Wstringop-overread"
+#endif
+
 	if (ACPI_COMPARE_NAMESEG(header->signature, ACPI_SIG_FACS)) {
 
 		/* FACS only has signature and length fields */
@@ -143,4 +148,5 @@ acpi_tb_print_table_header(acpi_physical_address address,
 			   local_header.asl_compiler_id,
 			   local_header.asl_compiler_revision));
 	}
+#pragma GCC diagnostic pop
 }
-- 
2.51.1