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The recent change to use pud_valid() as part of the implementation of
pud_user_accessible_page() fails to build when PGTABLE_LEVELS <= 2
because pud_valid() is not defined in that case.
Fix this by defining pud_valid() to false for this case. This means that
pud_user_accessible_page() will correctly always return false for this
config.
Fixes: f0f5863a0fb0 ("arm64/mm: Remove PTE_PROT_NONE bit")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202405082221.43rfWxz5-lkp@intel.com/
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Link: https://lore.kernel.org/r/20240509122844.563320-1-ryan.roberts@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
cb67ea121c