arm64: kaslr: Reserve size of ARM64_MEMSTART_ALIGN in linear region
When KASLR is enabled (CONFIG_RANDOMIZE_BASE=y), the top 4K of kernel virtual address space may be mapped to physical addresses despite being reserved for ERR_PTR values. Fix the randomization of the linear region so that we avoid mapping the last page of the virtual address space. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Nliyueyi <liyueyi@live.com> [will: rewrote commit message; merged in suggestion from Ard] Signed-off-by: NWill Deacon <will.deacon@arm.com>
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