Kexec Handover Performance Improvements
summary
Replaces the xarray+serialize linked‑list handover with a rad‑tree key encoding that packs physical address and page order so the kernel only passes a single root pointer in the device tree, making the KHO handover a constant‑time handover and removing the serialization/state machine step; a patch set is submitted for mainline. Restoration still requires walking the tree early boot, depends on initialized struct page so it blocks deferred page init and needs strategies for parallel preserved‑page reservation and versioned FDT compatibility.
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