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KHO currently restricts the maximum order of a restored page to the maximum order supported by the buddy allocator. While this works fine for much of the data passed across kexec, it is possible to have pages larger than MAX_PAGE_ORDER. For one, it is possible to get a larger order when using kho_preserve_pages() if the number of pages is large enough, since it tries to combine multiple aligned 0-order preservations into one higher order preservation. For another, upcoming support for hugepages can have gigantic hugepages being preserved over KHO. There is no real reason for this limit. The KHO preservation machinery can handle any page order. Remove this artificial restriction on max page order. Link: https://lkml.kernel.org/r/20260309123410.382308-2-pratyush@kernel.org Signed-off-by: Pratyush Yadav <pratyush@kernel.org> Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org> Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Cc: Alexander Graf <graf@amazon.com> Cc: Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Samiullah Khawaja <skhawaja@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>