[linux-next:master 9443/10326] mm/pagewalk.c:261:12: warning: stack frame size (2144) exceeds limit (2048) in 'walk_pgd_range'

[linux-next:master 9443/10326] mm/pagewalk.c:261:12: warning: stack frame size (2144) exceeds limit (2048) in 'walk_pgd_range'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   f7efed9f38f886edb450041b82a6f15d663c98f8
commit: 0dfcf1e2873372f51dd86a7cfabc1b8bbf776269 [9443/10326] mm/pagewalk: walk_pte_range() allow for pte_offset_map()
config: riscv-buildonly-randconfig-r001-20230615 (https://download.01.org/0day-ci/archive/20230617/202306171343.1IeyGfuO-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce: (https://download.01.org/0day-ci/archive/20230617/202306171343.1IeyGfuO-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306171343.1IeyGfuO-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/pagewalk.c:261:12: warning: stack frame size (2144) exceeds limit (2048) in 'walk_pgd_range' [-Wframe-larger-than]
   static int walk_pgd_range(unsigned long addr, unsigned long end,
              ^
   1 warning generated.


vim +/walk_pgd_range +261 mm/pagewalk.c

c2febafc67734a Kirill A. Shutemov 2017-03-09  260  
fafaa4264eba49 Naoya Horiguchi    2015-02-11 @261  static int walk_pgd_range(unsigned long addr, unsigned long end,
fafaa4264eba49 Naoya Horiguchi    2015-02-11  262  			  struct mm_walk *walk)
fafaa4264eba49 Naoya Horiguchi    2015-02-11  263  {
fafaa4264eba49 Naoya Horiguchi    2015-02-11  264  	pgd_t *pgd;
fafaa4264eba49 Naoya Horiguchi    2015-02-11  265  	unsigned long next;
7b86ac3371b70c Christoph Hellwig  2019-08-28  266  	const struct mm_walk_ops *ops = walk->ops;
fafaa4264eba49 Naoya Horiguchi    2015-02-11  267  	int err = 0;
fafaa4264eba49 Naoya Horiguchi    2015-02-11  268  
e47690d756a760 Steven Price       2020-02-03  269  	if (walk->pgd)
e47690d756a760 Steven Price       2020-02-03  270  		pgd = walk->pgd + pgd_index(addr);
e47690d756a760 Steven Price       2020-02-03  271  	else
fafaa4264eba49 Naoya Horiguchi    2015-02-11  272  		pgd = pgd_offset(walk->mm, addr);
fafaa4264eba49 Naoya Horiguchi    2015-02-11  273  	do {
fafaa4264eba49 Naoya Horiguchi    2015-02-11  274  		next = pgd_addr_end(addr, end);
fafaa4264eba49 Naoya Horiguchi    2015-02-11  275  		if (pgd_none_or_clear_bad(pgd)) {
7b86ac3371b70c Christoph Hellwig  2019-08-28  276  			if (ops->pte_hole)
b7a16c7ad790d0 Steven Price       2020-02-03  277  				err = ops->pte_hole(addr, next, 0, walk);
fafaa4264eba49 Naoya Horiguchi    2015-02-11  278  			if (err)
fafaa4264eba49 Naoya Horiguchi    2015-02-11  279  				break;
fafaa4264eba49 Naoya Horiguchi    2015-02-11  280  			continue;
fafaa4264eba49 Naoya Horiguchi    2015-02-11  281  		}
3afc423632a194 Steven Price       2020-02-03  282  		if (ops->pgd_entry) {
3afc423632a194 Steven Price       2020-02-03  283  			err = ops->pgd_entry(pgd, addr, next, walk);
3afc423632a194 Steven Price       2020-02-03  284  			if (err)
3afc423632a194 Steven Price       2020-02-03  285  				break;
3afc423632a194 Steven Price       2020-02-03  286  		}
e17eae2b839937 Christophe Leroy   2021-06-28  287  		if (is_hugepd(__hugepd(pgd_val(*pgd))))
e17eae2b839937 Christophe Leroy   2021-06-28  288  			err = walk_hugepd_range((hugepd_t *)pgd, addr, next, walk, PGDIR_SHIFT);
e17eae2b839937 Christophe Leroy   2021-06-28  289  		else if (ops->p4d_entry || ops->pud_entry || ops->pmd_entry || ops->pte_entry)
c2febafc67734a Kirill A. Shutemov 2017-03-09  290  			err = walk_p4d_range(pgd, addr, next, walk);
fafaa4264eba49 Naoya Horiguchi    2015-02-11  291  		if (err)
fafaa4264eba49 Naoya Horiguchi    2015-02-11  292  			break;
fafaa4264eba49 Naoya Horiguchi    2015-02-11  293  	} while (pgd++, addr = next, addr != end);
fafaa4264eba49 Naoya Horiguchi    2015-02-11  294  
fafaa4264eba49 Naoya Horiguchi    2015-02-11  295  	return err;
fafaa4264eba49 Naoya Horiguchi    2015-02-11  296  }
fafaa4264eba49 Naoya Horiguchi    2015-02-11  297  

:::::: The code at line 261 was first introduced by commit
:::::: fafaa4264eba49fd10695c193a82760558d093f4 pagewalk: improve vma handling

:::::: TO: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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