[PATCH v2] powerpc/64s: Fix __pte_needs_flush() false positive warning

[Michael Ellerman]

On Fri, 03 Mar 2023 09:59:47 +1100, Benjamin Gray wrote:
> Userspace PROT_NONE ptes set _PAGE_PRIVILEGED, triggering a false
> positive debug assertion that __pte_flags_need_flush() is not called
> on a kernel mapping.
> 
> Detect when it is a userspace PROT_NONE page by checking the required
> bits of PAGE_NONE are set, and none of the RWX bits are set.
> pte_protnone() is insufficient here because it always returns 0 when
> CONFIG_NUMA_BALANCING=n.
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/64s: Fix __pte_needs_flush() false positive warning
      https://git.kernel.org/powerpc/c/1abce0580b89464546ae06abd5891ebec43c9470

cheers