[U-Boot] [PATCH v1 1/4] x86: acpi: Annotate struct acpi_table_header with __packed

[Andy Shevchenko]

GCC starts complaining about possible pointer misalignment of pointers to the
unpacked (alignment=4) structures in the packed (alignment=1) ones:

  CC      arch/x86/cpu/tangier/acpi.o
arch/x86/cpu/tangier/acpi.c: In function ‘acpi_create_fadt’:
arch/x86/cpu/tangier/acpi.c:22:37: warning: taking address of packed member of ‘struct acpi_fadt’ may result in an unaligned pointer value [-Waddress-of-packed-member]
  22 |  struct acpi_table_header *header = &(fadt->header);

  CC      arch/x86/lib/acpi_table.o
arch/x86/lib/acpi_table.c: In function ‘acpi_create_spcr’:
arch/x86/lib/acpi_table.c:366:37: warning: taking address of packed member of ‘struct acpi_spcr’ may result in an unaligned pointer value [-Waddress-of-packed-member]
  366 |  struct acpi_table_header *header = &(spcr->header);

Fix the potential issues by annotating embedded structures with __packed even
though they are packed naturally.

Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
---
 arch/x86/include/asm/acpi_table.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/acpi_table.h b/arch/x86/include/asm/acpi_table.h
index 02aea127c1..7588913f93 100644
--- a/arch/x86/include/asm/acpi_table.h
+++ b/arch/x86/include/asm/acpi_table.h
@@ -34,7 +34,7 @@ struct acpi_rsdp {
 };
 
 /* Generic ACPI header, provided by (almost) all tables */
-struct acpi_table_header {
+struct __packed acpi_table_header {
 	char signature[4];	/* ACPI signature (4 ASCII characters) */
 	u32 length;		/* Table length in bytes (incl. header) */
 	u8 revision;		/* Table version (not ACPI version!) */
-- 
2.23.0.rc1