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Add the missing code to allocate P4D level page tables when cloning the the kernel page tables. This fixes a crash that may be observed when attempting to resume from hibernation on an LPA2 capable system with 4k pages, which therefore uses 5 levels of paging. Presumably, kexec is equally affected. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250110175145.785702-2-ardb+git@google.com Signed-off-by: Will Deacon <will@kernel.org>