Re: [PATCH] riscv: mm: Pre-allocate PGD entries vmalloc/modules area

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

Hi Björn,

kernel test robot noticed the following build warnings:

[auto build test WARNING on ac9a78681b921877518763ba0e89202254349d1b]

url:    https://github.com/intel-lab-lkp/linux/commits/Bj-rn-T-pel/riscv-mm-Pre-allocate-PGD-entries-vmalloc-modules-area/20230530-020212
base:   ac9a78681b921877518763ba0e89202254349d1b
patch link:    https://lore.kernel.org/r/20230529180023.289904-1-bjorn%40kernel.org
patch subject: [PATCH] riscv: mm: Pre-allocate PGD entries vmalloc/modules area
config: riscv-randconfig-r042-20230530 (https://download.01.org/0day-ci/archive/20230531/202305310822.dhnyydJC-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 12.3.0
reproduce (this is a W=1 build):
        mkdir -p ~/bin
        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/9383adbcdfb7f850149742579615e8c174328a78
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Bj-rn-T-pel/riscv-mm-Pre-allocate-PGD-entries-vmalloc-modules-area/20230530-020212
        git checkout 9383adbcdfb7f850149742579615e8c174328a78
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.3.0 ~/bin/make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.3.0 ~/bin/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/mm/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202305310822.dhnyydJC-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/riscv/mm/init.c: In function 'preallocate_pgd_pages_range':
   arch/riscv/mm/init.c:1381:30: error: implicit declaration of function 'pgd_offset_k'; did you mean 'p4d_offset'? [-Werror=implicit-function-declaration]
    1381 |                 pgd_t *pgd = pgd_offset_k(addr);
         |                              ^~~~~~~~~~~~
         |                              p4d_offset
>> arch/riscv/mm/init.c:1381:30: warning: initialization of 'pgd_t *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
   arch/riscv/mm/init.c:1387:23: error: implicit declaration of function 'p4d_alloc'; did you mean 'd_alloc'? [-Werror=implicit-function-declaration]
    1387 |                 p4d = p4d_alloc(&init_mm, pgd, addr);
         |                       ^~~~~~~~~
         |                       d_alloc
>> arch/riscv/mm/init.c:1387:21: warning: assignment to 'p4d_t *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1387 |                 p4d = p4d_alloc(&init_mm, pgd, addr);
         |                     ^
   arch/riscv/mm/init.c:1395:23: error: implicit declaration of function 'pud_alloc'; did you mean 'd_alloc'? [-Werror=implicit-function-declaration]
    1395 |                 pud = pud_alloc(&init_mm, p4d, addr);
         |                       ^~~~~~~~~
         |                       d_alloc
>> arch/riscv/mm/init.c:1395:21: warning: assignment to 'pud_t *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1395 |                 pud = pud_alloc(&init_mm, p4d, addr);
         |                     ^
   arch/riscv/mm/init.c:1403:23: error: implicit declaration of function 'pmd_alloc'; did you mean 'mm_alloc'? [-Werror=implicit-function-declaration]
    1403 |                 pmd = pmd_alloc(&init_mm, pud, addr);
         |                       ^~~~~~~~~
         |                       mm_alloc
>> arch/riscv/mm/init.c:1403:21: warning: assignment to 'pmd_t *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1403 |                 pmd = pmd_alloc(&init_mm, pud, addr);
         |                     ^
   arch/riscv/mm/init.c: In function 'pgtable_cache_init':
   arch/riscv/mm/init.c:1421:45: error: 'MODULES_VADDR' undeclared (first use in this function)
    1421 |                 preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules");
         |                                             ^~~~~~~~~~~~~
   arch/riscv/mm/init.c:1421:45: note: each undeclared identifier is reported only once for each function it appears in
   arch/riscv/mm/init.c:1421:60: error: 'MODULES_END' undeclared (first use in this function)
    1421 |                 preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules");
         |                                                            ^~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +1381 arch/riscv/mm/init.c

  1366	
  1367	#ifdef CONFIG_64BIT
  1368	/*
  1369	 * Pre-allocates page-table pages for a specific area in the kernel
  1370	 * page-table. Only the level which needs to be synchronized between
  1371	 * all page-tables is allocated because the synchronization can be
  1372	 * expensive.
  1373	 */
  1374	static void __init preallocate_pgd_pages_range(unsigned long start, unsigned long end,
  1375						       const char *area)
  1376	{
  1377		unsigned long addr;
  1378		const char *lvl;
  1379	
  1380		for (addr = start; addr < end && addr >= start; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
> 1381			pgd_t *pgd = pgd_offset_k(addr);
  1382			p4d_t *p4d;
  1383			pud_t *pud;
  1384			pmd_t *pmd;
  1385	
  1386			lvl = "p4d";
> 1387			p4d = p4d_alloc(&init_mm, pgd, addr);
  1388			if (!p4d)
  1389				goto failed;
  1390	
  1391			if (pgtable_l5_enabled)
  1392				continue;
  1393	
  1394			lvl = "pud";
> 1395			pud = pud_alloc(&init_mm, p4d, addr);
  1396			if (!pud)
  1397				goto failed;
  1398	
  1399			if (pgtable_l4_enabled)
  1400				continue;
  1401	
  1402			lvl = "pmd";
> 1403			pmd = pmd_alloc(&init_mm, pud, addr);
  1404			if (!pmd)
  1405				goto failed;
  1406		}
  1407		return;
  1408	
  1409	failed:
  1410		/*
  1411		 * The pages have to be there now or they will be missing in
  1412		 * process page-tables later.
  1413		 */
  1414		panic("Failed to pre-allocate %s pages for %s area\n", lvl, area);
  1415	}
  1416	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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