Re: [for-next v4 2/5] net: ionic: Add PHC state page for user space access

[sashiko-bot@kernel.org]

> Add a page associated with the PHC that can be mapped to user space,
> allowing applications to access hardware timestamp information.
> 
> In order to synchronize between kernel and user space, a sequence
> number is incremented at the beginning and end of each update.
> An odd number means the data is being updated while an even number
> means the update is complete. To guarantee that the data structure
> was accessed atomically, user space will:
> 
> repeat:
>         seq1 = <read sequence>
>         goto <repeat> if odd
>         <read PHC state>
>         seq2 = <read sequence>
>         if seq1 != seq2 goto repeat
> 
> This mechanism acts as a guard against reading invalid state during
> concurrent updates.
> 
> Co-developed-by: Allen Hubbe <allen.hubbe@amd.com>
> Signed-off-by: Allen Hubbe <allen.hubbe@amd.com>
> Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20260610154216.712374-1-abhijit.gangurde@amd.com?part=2