# Re: \[PATCH v3 1/2\] arm64: Move handling of erratum 1418040 into C code

- From: Stephen Boyd \<hidden\>
- Date: 2020-07-31 18:02:25 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2020/07/8797325
- Thread: https://ratatoskr.run/linux-arm-kernel/2020/07/8797321/t.md

```text
Quoting Marc Zyngier (2020-07-31 10:38:23)
> Instead of dealing with erratum 1418040 on each entry and exit,
> let's move the handling to __switch_to() instead, which has
> several advantages:
> 
> - It can be applied when it matters (switching between 32 and 64
>   bit tasks).
> - It is written in C (yay!)
> - It can rely on static keys rather than alternatives
> 
> Tested-by: Sai Prakash Ranjan <redacted>
> Acked-by: Will Deacon <will@kernel.org>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---

Reviewed-by: Stephen Boyd <redacted>

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```