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

[Ankur Arora]

On 2021-01-07 2:30 p.m., Kinney, Michael D wrote:
> 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>

Thanks. Will fix up the coding style and resend with the rest of the series.

Ankur

> 
> 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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