From: "Laszlo Ersek" <lersek@redhat.com>
To: devel@edk2.groups.io, ankur.a.arora@oracle.com
Cc: Liming Gao <gaoliming@byosoft.com.cn>,
Michael D Kinney <michael.d.kinney@intel.com>
Subject: Re: [edk2-devel] [PATCH] MdePkg: use CpuPause() in CpuDeadLoop()
Date: Wed, 17 Mar 2021 19:30:55 +0100 [thread overview]
Message-ID: <2212bc34-f8b5-fd65-aa2e-c91b7b97915c@redhat.com> (raw)
In-Reply-To: <20210316225918.2625938-1-ankur.a.arora@oracle.com>
On 03/16/21 23:59, Ankur Arora wrote:
> Use CpuPause() to allow the CPU to go into a lower power state
> state while we spin wait.
>
> Cc: Liming Gao <gaoliming@byosoft.com.cn>
> Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
> ---
> MdePkg/Library/BaseLib/CpuDeadLoop.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/MdePkg/Library/BaseLib/CpuDeadLoop.c b/MdePkg/Library/BaseLib/CpuDeadLoop.c
> index 9e110cacbc96..3cd304351a65 100644
> --- a/MdePkg/Library/BaseLib/CpuDeadLoop.c
> +++ b/MdePkg/Library/BaseLib/CpuDeadLoop.c
> @@ -28,5 +28,7 @@ CpuDeadLoop (
> {
> volatile UINTN Index;
>
> - for (Index = 0; Index == 0;);
> + for (Index = 0; Index == 0;) {
> + CpuPause();
> + }
> }
>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
(for RISC-V and ARM64, the implementations seem to be "nop" instructions)
Thanks
Laszlo
prev parent reply other threads:[~2021-03-17 18:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-16 22:59 [PATCH] MdePkg: use CpuPause() in CpuDeadLoop() Ankur Arora
2021-03-17 1:08 ` 回复: " gaoliming
2021-03-17 3:54 ` Ankur Arora
2021-03-17 18:30 ` Laszlo Ersek [this message]
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