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[ Upstream commit 8246601 ] If non-leaf PTEs I.E pmd, pud or p4d is modified, a sfence.vma is a must for safe, imagine if an implementation caches the non-leaf translation in TLB, although I didn't meet this HW so far, but it's possible in theory. Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Fixes: c5e9b2c ("riscv: Improve tlb_flush()") Link: https://lore.kernel.org/r/20231219175046.2496-2-jszhang@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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