[joro:vmalloc-sync 1/7] include/linux/mm.h:2252:9: warning: returning 'int' from a function with return type 'pte_t *' {aka 'long unsigned int *'} makes pointer from integer without a cast

[kbuild test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git vmalloc-sync
head:   6cf448bfc585dee8f380e6b1681707e6faf7a254
commit: 81841ceb1b2a27530139b9fb5bb0579b4fbd524e [1/7] mm: Add functions to track page-table modifications
config: arm-mps2_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 81841ceb1b2a27530139b9fb5bb0579b4fbd524e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from arch/arm/kernel/asm-offsets.c:10:
   include/linux/mm.h: In function 'pte_alloc_kernel_track':
   include/linux/mm.h:2246:15: error: implicit declaration of function 'pmd_none'; did you mean 'p4d_none'? [-Werror=implicit-function-declaration]
    2246 |  if (unlikely(pmd_none(*(pmd)))) {
         |               ^~~~~~~~
   include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
      78 | # define unlikely(x) __builtin_expect(!!(x), 0)
         |                                          ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   include/linux/mm.h:2252:9: error: implicit declaration of function 'pte_offset_kernel' [-Werror=implicit-function-declaration]
    2252 |  return pte_offset_kernel(pmd, address);
         |         ^~~~~~~~~~~~~~~~~
>> include/linux/mm.h:2252:9: warning: returning 'int' from a function with return type 'pte_t *' {aka 'long unsigned int *'} makes pointer from integer without a cast [-Wint-conversion]
    2252 |  return pte_offset_kernel(pmd, address);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
   make[2]: *** [scripts/Makefile.build:100: arch/arm/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1141: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:180: sub-make] Error 2

vim +2252 include/linux/mm.h

  2231	
  2232	#define pte_alloc_map(mm, pmd, address)			\
  2233		(pte_alloc(mm, pmd) ? NULL : pte_offset_map(pmd, address))
  2234	
  2235	#define pte_alloc_map_lock(mm, pmd, address, ptlp)	\
  2236		(pte_alloc(mm, pmd) ?			\
  2237			 NULL : pte_offset_map_lock(mm, pmd, address, ptlp))
  2238	
  2239	#define pte_alloc_kernel(pmd, address)			\
  2240		((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd))? \
  2241			NULL: pte_offset_kernel(pmd, address))
  2242	
  2243	static inline pte_t *pte_alloc_kernel_track(pmd_t *pmd, unsigned long address,
  2244						    pgtbl_mod_mask *mod_mask)
  2245	{
  2246		if (unlikely(pmd_none(*(pmd)))) {
  2247			if (__pte_alloc_kernel(pmd))
  2248				return NULL;
  2249			*mod_mask |= PGTBL_PMD_MODIFIED;
  2250		}
  2251	
> 2252		return pte_offset_kernel(pmd, address);
  2253	}
  2254	#if USE_SPLIT_PMD_PTLOCKS
  2255	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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