On Tue, 31 Jan 2023 22:14:07 +1100, Michael Ellerman wrote:

Commit baf1ed24b27d ("powerpc/mm: Remove empty hash__ functions")
removed some empty hash MMU flushing routines, but got a bit overeager
and also removed the call to hash__tlb_flush() from tlb_flush().

In regular use this doesn't lead to any noticable breakage, which is a
little concerning. Presumably there are flushes happening via other
paths such as arch_leave_lazy_mmu_mode(), and/or a bit of luck.

[...]

Applied to powerpc/fixes.

[1/1] powerpc/64s: Reconnect tlb_flush() to hash__tlb_flush()
      https://git.kernel.org/powerpc/c/1665c027afb225882a5a0b014c45e84290b826c2

cheers