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GCC 9.2 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@linux.intel.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> [bmeng: add GCC version number in the commit message] Signed-off-by: Bin Meng <bmeng.cn@gmail.com> |
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