Re: [PATCH v3 19/35] acpi: build_waet: use acpi_table_begin()/acpi_table_end() instead of build_header()

[Eric Auger]

On 9/7/21 4:47 PM, Igor Mammedov wrote:
> it replaces error-prone pointer arithmetic for build_header() API,
> with 2 calls to start and finish table creation,
> which hides offsets magic from API user.
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
> v3:
>   * s/acpi_init_table|acpi_table_composed/acpi_table_begin|acpi_table_end/
> 
> CC: marcel.apfelbaum@gmail.com
> ---
>  hw/i386/acpi-build.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 2875c4f393..45724469b0 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -2201,10 +2201,10 @@ static void
>  build_waet(GArray *table_data, BIOSLinker *linker, const char *oem_id,
>             const char *oem_table_id)
>  {
> -    int waet_start = table_data->len;
> +    AcpiTable table = { .sig = "WAET", .rev = 1, .oem_id = oem_id,
> +                        .oem_table_id = oem_table_id };
>  
> -    /* WAET header */
> -    acpi_data_push(table_data, sizeof(AcpiTableHeader));
> +    acpi_table_begin(&table, table_data);
>      /*
>       * Set "ACPI PM timer good" flag.
>       *
> @@ -2213,9 +2213,7 @@ build_waet(GArray *table_data, BIOSLinker *linker, 
> const char *oem_id,
>       * Which avoids costly VMExits caused by guest re-reading it 
> unnecessarily.
>       */
>      build_append_int_noprefix(table_data, 1 << 1 /* ACPI PM timer good */, 
> 4);
> -
> -    build_header(linker, table_data, (void *)(table_data->data + waet_start),
> -                 "WAET", table_data->len - waet_start, 1, oem_id, 
> oem_table_id);
> +    acpi_table_end(linker, &table);
>  }
>  
>  /*
> 
an easy one

Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric