Re: [PATCH v2] arm64/mm: Check the requested PFN range during memory removal

[Will Deacon]

On Tue, 21 Jul 2026 18:00:26 +0800, Richard Cheng wrote:
> prevent_memory_remove_notifier() advances pfn while scanning the requested
> range for early memory. When the loop completes, pfn is at or beyond
> end_pfn. Passing it to can_unmap_without_split() therefore checks a range
> after the one being offlined.
> 
> Consequently, a valid request can be rejected based on the following
> range, while a request that would split a leaf mapping can be accepted if
> the shifted range can be unmapped without a split. This was observed with
> CXL DAX memory, where the final memory block was incorrectly allowed to
> be offlined.
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64/mm: Check the requested PFN range during memory removal
      https://git.kernel.org/arm64/c/285f90a4d1141

Cheers,
-- 
Will

https://fixes.arm64.dev
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