mm: arm64: document why pte is not advanced in contpte_ptep_set_access_flags()

According to David and Ryan, there isn't a bug here, even though we
don't advance the PTE entry, because __ptep_set_access_flags() only
uses the access flags from the entry.

However, we always check pte_same(pte, entry) using the first entry
in __ptep_set_access_flags(). This means that the checks from 1 to
nr - 1 are not comparing the same PTE indexes (thus, they always
return false), which can be a bit confusing. To clarify the code, let's
add some comments.

Reviewed-by: Ryan Roberts <[email protected]>
Signed-off-by: Barry Song <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: John Hubbard <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Will Deacon <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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