Chris:
  Does ACPI 6.4 spec have removed them? If yes, I agree this change.

Thanks
Liming
> -----邮件原件-----
> 发件人: Chris Jones <christopher.jones@arm.com>
> 发送时间: 2021年10月18日 23:11
> 收件人: devel@edk2.groups.io
> 抄送: michael.d.kinney@intel.com; gaoliming@byosoft.com.cn;
> zhiguang.liu@intel.com; ray.ni@intel.com; zhichao.gao@intel.com;
> Alexei.Fedorov@arm.com; Sami.Mujawar@arm.com; nd@arm.com
> 主题: [PATCH v1 2/7] MdePkg: Remove PPTT ID type structure
>
> Bugzilla: 3697 (https://bugzilla.tianocore.org/show_bug.cgi?id=3697)
>
> The ACPI 6.3A specification deprecated the PPTT ID type structure (type
> 2) therefore remove it from Acpi64.h.
>
> Mantis ID: 2072 (https://mantis.uefi.org/mantis/view.php?id=2072)
>
> Signed-off-by: Chris Jones <christopher.jones@arm.com>
> ---
>  MdePkg/Include/IndustryStandard/Acpi64.h | 16 ----------------
>  1 file changed, 16 deletions(-)
>
> diff --git a/MdePkg/Include/IndustryStandard/Acpi64.h
> b/MdePkg/Include/IndustryStandard/Acpi64.h
> index
> 625504ba77b4000c0a0b540299d2e0e42c768400..bc1522722424156f0381e8
> 48c2617760f2d31aba 100644
> --- a/MdePkg/Include/IndustryStandard/Acpi64.h
> +++ b/MdePkg/Include/IndustryStandard/Acpi64.h
> @@ -2613,7 +2613,6 @@ typedef struct {
>  ///
>  #define EFI_ACPI_6_4_PPTT_TYPE_PROCESSOR     0x00
>  #define EFI_ACPI_6_4_PPTT_TYPE_CACHE         0x01
> -#define EFI_ACPI_6_4_PPTT_TYPE_ID            0x02
>
>  ///
>  /// PPTT Structure Header
> @@ -2737,21 +2736,6 @@ typedef struct {
>    UINT32                                        CacheId;
>  } EFI_ACPI_6_4_PPTT_STRUCTURE_CACHE;
>
> -///
> -/// ID structure
> -///
> -typedef struct {
> -  UINT8                         Type;
> -  UINT8                         Length;
> -  UINT8                         Reserved[2];
> -  UINT32                        VendorId;
> -  UINT64                        Level1Id;
> -  UINT64                        Level2Id;
> -  UINT16                        MajorRev;
> -  UINT16                        MinorRev;
> -  UINT16                        SpinRev;
> -} EFI_ACPI_6_4_PPTT_STRUCTURE_ID;
> -
>  ///
>  /// Platform Health Assessment Table (PHAT) Format
>  ///
> --
> Guid("CE165669-3EF3-493F-B85D-6190EE5B9759")