[PATCH 24/33] m68k: Convert various functions to use ptdescs

[kernel test robot]

Hi Vishal,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on next-20230417]
[cannot apply to s390/features powerpc/next powerpc/fixes geert-m68k/for-next geert-m68k/for-linus linus/master v6.3-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Vishal-Moola-Oracle/s390-Use-_pt_s390_gaddr-for-gmap-address-tracking/20230418-045832
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20230417205048.15870-25-vishal.moola%40gmail.com
patch subject: [PATCH 24/33] m68k: Convert various functions to use ptdescs
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230418/202304180652.LeoLmaNQ-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 12.1.0
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
        # https://github.com/intel-lab-lkp/linux/commit/630b38053b213e6138d3deb3e4325b24ad6dcb1f
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Vishal-Moola-Oracle/s390-Use-_pt_s390_gaddr-for-gmap-address-tracking/20230418-045832
        git checkout 630b38053b213e6138d3deb3e4325b24ad6dcb1f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash arch/m68k/mm/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp at intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304180652.LeoLmaNQ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/m68k/mm/motorola.c: In function 'free_pointer_table':
>> arch/m68k/mm/motorola.c:204:56: warning: passing argument 1 of 'virt_to_ptdesc' makes pointer from integer without a cast [-Wint-conversion]
     204 |                         ptdesc_pte_dtor(virt_to_ptdesc(page));
         |                                                        ^~~~
         |                                                        |
         |                                                        long unsigned int
   In file included from arch/m68k/mm/motorola.c:15:
   include/linux/mm.h:2721:57: note: expected 'const void *' but argument is of type 'long unsigned int'
    2721 | static inline struct ptdesc *virt_to_ptdesc(const void *x)
         |                                             ~~~~~~~~~~~~^
   arch/m68k/mm/motorola.c: At top level:
   arch/m68k/mm/motorola.c:418:13: warning: no previous prototype for 'paging_init' [-Wmissing-prototypes]
     418 | void __init paging_init(void)
         |             ^~~~~~~~~~~


vim +/virt_to_ptdesc +204 arch/m68k/mm/motorola.c

   185	
   186	int free_pointer_table(void *table, int type)
   187	{
   188		ptable_desc *dp;
   189		unsigned long ptable = (unsigned long)table;
   190		unsigned long page = ptable & PAGE_MASK;
   191		unsigned int mask = 1U << ((ptable - page)/ptable_size(type));
   192	
   193		dp = PD_PTABLE(page);
   194		if (PD_MARKBITS (dp) & mask)
   195			panic ("table already free!");
   196	
   197		PD_MARKBITS (dp) |= mask;
   198	
   199		if (PD_MARKBITS(dp) == ptable_mask(type)) {
   200			/* all tables in page are free, free page */
   201			list_del(dp);
   202			mmu_page_dtor((void *)page);
   203			if (type == TABLE_PTE)
 > 204				ptdesc_pte_dtor(virt_to_ptdesc(page));
   205			free_page (page);
   206			return 1;
   207		} else if (ptable_list[type].next != dp) {
   208			/*
   209			 * move this descriptor to the front of the list, since
   210			 * it has one or more free tables.
   211			 */
   212			list_move(dp, &ptable_list[type]);
   213		}
   214		return 0;
   215	}
   216	

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