Re: [PATCH v8 9/9] dax/hmem: Reintroduce Soft Reserved ranges back into the iomem tree
From: Dan Williams
Date: Mon Mar 23 2026 - 17:09:46 EST
Smita Koralahalli wrote:
> Reworked from a patch by Alison Schofield <alison.schofield@xxxxxxxxx>
>
> Reintroduce Soft Reserved range into the iomem_resource tree for HMEM
> to consume.
>
> This restores visibility in /proc/iomem for ranges actively in use, while
> avoiding the early-boot conflicts that occurred when Soft Reserved was
> published into iomem before CXL window and region discovery.
I recommend dropping this patch. Given that the v7.0 kernel already set
a new precedent of not publishing "Soft Reserve", there is no pressing
need at this time to bring it back. We can always revive a patch like
this with a regression rationale, but otherwise a less busy /proc/iomem
is attractive.