Re: [edk2-devel] [PATCH v1 3/3] UefiCpuPkg/CpuCacheInfoLib: Add QuickSort function on BaseLib

["Marvin Häuser" <mhaeuser@posteo.de>]

Good day Ianx,

On 15.10.21 16:33, IanX Kuo wrote:
> From: IanX Kuo <ianx.kuo@intel.com>
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3675
>
> Remove MdeModulePkg dependency
>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Rahul Kumar <rahul1.kumar@intel.com>
> Signed-off-by: IanX Kuo <ianx.kuo@intel.com>
> ---
>   UefiCpuPkg/Library/CpuCacheInfoLib/CpuCacheInfoLib.c         | 5 ++++-
>   UefiCpuPkg/Library/CpuCacheInfoLib/DxeCpuCacheInfoLib.inf    | 2 --
>   UefiCpuPkg/Library/CpuCacheInfoLib/InternalCpuCacheInfoLib.h | 1 -
>   UefiCpuPkg/Library/CpuCacheInfoLib/PeiCpuCacheInfoLib.inf    | 2 --
>   4 files changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/UefiCpuPkg/Library/CpuCacheInfoLib/CpuCacheInfoLib.c b/UefiCpuPkg/Library/CpuCacheInfoLib/CpuCacheInfoLib.c
> index c0077d6770..b5ed05bd43 100644
> --- a/UefiCpuPkg/Library/CpuCacheInfoLib/CpuCacheInfoLib.c
> +++ b/UefiCpuPkg/Library/CpuCacheInfoLib/CpuCacheInfoLib.c
> @@ -282,6 +282,7 @@ CpuCacheInfoCollectCpuCacheInfoData (
>     UINTN                     LocalCacheInfoCount;
>     UINTN                     Index;
>     UINTN                     NextIndex;
> +  VOID                      *QuickSortBuffer;
>   
>     //
>     // Get number of Packages and Package ID.
> @@ -369,7 +370,9 @@ CpuCacheInfoCollectCpuCacheInfoData (
>       //
>       // Sort LocalCacheInfo array by CPU package ID, core type, cache level and cache type.
>       //
> -    PerformQuickSort (LocalCacheInfo, LocalCacheInfoCount, sizeof (*LocalCacheInfo), (SORT_COMPARE) CpuCacheInfoCompare);
> +    QuickSortBuffer = AllocateZeroPool (sizeof (*LocalCacheInfo));
> +    ASSERT (QuickSortBuffer != NULL);

Dynamic allocations should always be handled with a proper runtime 
check, but I think LocalCacheInfo is small enough to live on the stack 
anyway, no?

Best regards,
Marvin

> +    QuickSort (LocalCacheInfo, LocalCacheInfoCount, sizeof (*LocalCacheInfo), (BASE_SORT_COMPARE) CpuCacheInfoCompare, QuickSortBuffer);
>       CopyMem (CacheInfo, LocalCacheInfo, sizeof (*CacheInfo) * LocalCacheInfoCount);
>       DEBUG_CODE (
>         CpuCacheInfoPrintCpuCacheInfoTable (CacheInfo, LocalCacheInfoCount);
> diff --git a/UefiCpuPkg/Library/CpuCacheInfoLib/DxeCpuCacheInfoLib.inf b/UefiCpuPkg/Library/CpuCacheInfoLib/DxeCpuCacheInfoLib.inf
> index c3d3f1e799..fdd79970f9 100644
> --- a/UefiCpuPkg/Library/CpuCacheInfoLib/DxeCpuCacheInfoLib.inf
> +++ b/UefiCpuPkg/Library/CpuCacheInfoLib/DxeCpuCacheInfoLib.inf
> @@ -25,7 +25,6 @@
>   
>   [Packages]
>     MdePkg/MdePkg.dec
> -  MdeModulePkg/MdeModulePkg.dec
>     UefiCpuPkg/UefiCpuPkg.dec
>   
>   [LibraryClasses]
> @@ -34,7 +33,6 @@
>     BaseMemoryLib
>     MemoryAllocationLib
>     UefiBootServicesTableLib
> -  SortLib
>   
>   [Protocols]
>     gEfiMpServiceProtocolGuid
> diff --git a/UefiCpuPkg/Library/CpuCacheInfoLib/InternalCpuCacheInfoLib.h b/UefiCpuPkg/Library/CpuCacheInfoLib/InternalCpuCacheInfoLib.h
> index 26e1f46516..829a9f43ce 100644
> --- a/UefiCpuPkg/Library/CpuCacheInfoLib/InternalCpuCacheInfoLib.h
> +++ b/UefiCpuPkg/Library/CpuCacheInfoLib/InternalCpuCacheInfoLib.h
> @@ -17,7 +17,6 @@
>   #include <Library/DebugLib.h>
>   #include <Library/BaseMemoryLib.h>
>   #include <Library/MemoryAllocationLib.h>
> -#include <Library/SortLib.h>
>   #include <Library/CpuCacheInfoLib.h>
>   
>   typedef union {
> diff --git a/UefiCpuPkg/Library/CpuCacheInfoLib/PeiCpuCacheInfoLib.inf b/UefiCpuPkg/Library/CpuCacheInfoLib/PeiCpuCacheInfoLib.inf
> index 0864497849..c643fc89be 100644
> --- a/UefiCpuPkg/Library/CpuCacheInfoLib/PeiCpuCacheInfoLib.inf
> +++ b/UefiCpuPkg/Library/CpuCacheInfoLib/PeiCpuCacheInfoLib.inf
> @@ -25,7 +25,6 @@
>   
>   [Packages]
>     MdePkg/MdePkg.dec
> -  MdeModulePkg/MdeModulePkg.dec
>     UefiCpuPkg/UefiCpuPkg.dec
>   
>   [LibraryClasses]
> @@ -34,7 +33,6 @@
>     BaseMemoryLib
>     MemoryAllocationLib
>     PeiServicesTablePointerLib
> -  SortLib
>   
>   [Ppis]
>     gEdkiiPeiMpServices2PpiGuid