Re: [PATCH 1/1] ACPI: XSDT: struct acpi_table_xsdt must be packed

[Rafael J. Wysocki]

On Sat, Nov 11, 2023 at 2:48 PM Heinrich Schuchardt
<heinrich.schuchardt@xxxxxxxxxxxxx> wrote:
>
> According to the ACPI 6.5 specification the component Entry starts at
> offset 36 in the XSDT table which is not a multiple of 8. Hence we must
> mark the structure as packed.

There is #pragma pack(1) at the beginning of actbl.h.  Is it not sufficient?

> We did not see an error due to the incorrect packing yet as in
> acpi_tb_parse_root_table() we use ACPI_ADD_PTR() to find the address of
> Entry.
>
> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@xxxxxxxxxxxxx>
> ---
>  include/acpi/actbl.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/acpi/actbl.h b/include/acpi/actbl.h
> index 451f6276da49..1a37ac378765 100644
> --- a/include/acpi/actbl.h
> +++ b/include/acpi/actbl.h
> @@ -148,7 +148,7 @@ struct acpi_table_rsdt {
>  struct acpi_table_xsdt {
>         struct acpi_table_header header;        /* Common ACPI table header */
>         u64 table_offset_entry[1];      /* Array of pointers to ACPI tables */
> -};
> +} __packed;
>
>  #define ACPI_RSDT_ENTRY_SIZE        (sizeof (u32))
>  #define ACPI_XSDT_ENTRY_SIZE        (sizeof (u64))
> --
> 2.40.1
>