Hi David,

I love your patch! Yet something to improve:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Hildenbrand/mm-userfaultfd-rely-on-vma-vm_page_prot-in-uffd_wp_range/20221224-000206
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20221223155616.297723-3-david%40redhat.com
patch subject: [PATCH v1 2/2] mm/mprotect: drop pgprot_t parameter from change_protection()
config: mips-malta_defconfig
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project f5700e7b69048de958172fb513b336564e7f8709)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mipsel-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/c77a6bee317925cf3d078bc97a42d644503b9f1a
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review David-Hildenbrand/mm-userfaultfd-rely-on-vma-vm_page_prot-in-uffd_wp_range/20221224-000206
        git checkout c77a6bee317925cf3d078bc97a42d644503b9f1a
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> mm/mprotect.c:523:13: error: use of undeclared identifier 'PAGE_NONE'
                   newprot = PAGE_NONE;
                             ^
   1 error generated.


vim +/PAGE_NONE +523 mm/mprotect.c

   507	
   508	unsigned long change_protection(struct mmu_gather *tlb,
   509			       struct vm_area_struct *vma, unsigned long start,
   510			       unsigned long end, unsigned long cp_flags)
   511	{
   512		pgprot_t newprot = vma->vm_page_prot;
   513		unsigned long pages;
   514	
   515		BUG_ON((cp_flags & MM_CP_UFFD_WP_ALL) == MM_CP_UFFD_WP_ALL);
   516	
   517		/*
   518		 * Ordinary protection updates (mprotect, uffd-wp, softdirty tracking)
   519		 * are expected to reflect their requirements via VMA flags such that
   520		 * vma_set_page_prot() will adjust vma->vm_page_prot accordingly.
   521		 */
   522		if (cp_flags & MM_CP_PROT_NUMA)
 > 523			newprot = PAGE_NONE;
   524	
   525		if (is_vm_hugetlb_page(vma))
   526			pages = hugetlb_change_protection(vma, start, end, newprot,
   527							  cp_flags);
   528		else
   529			pages = change_protection_range(tlb, vma, start, end, newprot,
   530							cp_flags);
   531	
   532		return pages;
   533	}
   534	

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