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The idea is to allow any architecture to opt-in. Once [1] is accepted this may look redundant, but I still see the benefit in having it. I only did not manage to circumvent the ugly __no_sanitize_address for ptep_get_lockless() to make it avoid "bogus" kasan complains when gup_fast walks a page table that entered the lazy mmu mode. 1. https://lore.kernel.org/linux-mm/20260806083926.1807279-1-usama.anjum@arm.com/ > Thanks!