[edk2-devel] [PATCH v2 10/10] MdePkg: use CpuPause() in CpuDeadLoop()

[Michael D Kinney]

Looks like a good improvement.  One minor comment is that the loop 
should have {} to follow coding style:

  for (Index = 0; Index == 0;) {
    CpuPause();
  }

With that change:

Reviewed-by: Michael D Kinney <michael.d.kinney at intel.com>

Mike

> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Ankur Arora
> Sent: Thursday, January 7, 2021 11:55 AM
> To: devel at edk2.groups.io
> Cc: lersek at redhat.com; imammedo at redhat.com; boris.ostrovsky at oracle.com; Ankur Arora <ankur.a.arora at oracle.com>; Kinney,
> Michael D <michael.d.kinney at intel.com>; Liming Gao <gaoliming at byosoft.com.cn>; Liu, Zhiguang <zhiguang.liu at intel.com>;
> Aaron Young <aaron.young at oracle.com>
> Subject: [edk2-devel] [PATCH v2 10/10] MdePkg: use CpuPause() in CpuDeadLoop()
> 
> Use CpuPause() to allow the CPU to go into a lower power state
> state while we spin wait.
> 
> Cc: Michael D Kinney <michael.d.kinney at intel.com>
> Cc: Liming Gao <gaoliming at byosoft.com.cn>
> Cc: Zhiguang Liu <zhiguang.liu at intel.com>
> Cc: Laszlo Ersek <lersek at redhat.com>
> Cc: Igor Mammedov <imammedo at redhat.com>
> Cc: Boris Ostrovsky <boris.ostrovsky at oracle.com>
> Cc: Aaron Young <aaron.young at oracle.com>
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
> Signed-off-by: Ankur Arora <ankur.a.arora at oracle.com>
> ---
>  MdePkg/Library/BaseLib/CpuDeadLoop.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/MdePkg/Library/BaseLib/CpuDeadLoop.c b/MdePkg/Library/BaseLib/CpuDeadLoop.c
> index 9e110cacbc96..e76312de7b4e 100644
> --- a/MdePkg/Library/BaseLib/CpuDeadLoop.c
> +++ b/MdePkg/Library/BaseLib/CpuDeadLoop.c
> @@ -28,5 +28,6 @@ CpuDeadLoop (
>  {
> 
>    volatile UINTN  Index;
> 
> 
> 
> -  for (Index = 0; Index == 0;);
> 
> +  for (Index = 0; Index == 0;)
> 
> +  	CpuPause();> 
>  }
> 
> --
> 2.9.3
> 
> 
> 
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