arm64: update stale PAGE_OFFSET comment
Commit ab893fb9 ("arm64: introduce KIMAGE_VADDR as the virtual base of the kernel region") logically split KIMAGE_VADDR from PAGE_OFFSET, and since commit f9040773 ("arm64: move kernel image to base of vmalloc area") the two have been distinct values. Unfortunately, neither commit updated the comment above these definitions, which now erroneously states that PAGE_OFFSET is the start of the kernel image rather than the start of the linear mapping. This patch fixes said comment, and introduces an explanation of KIMAGE_VADDR. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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