[ardb:module-combine-init-allocations 1/8] mm/execmem.c:91:26: error: call to undeclared function 'get_vm_area_page_order'; ISO C99 and later do not support implicit function declarations

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git module-combine-init-allocations
head:   a598b33b1d60eb215a71876eaf9e694fa22e48ba
commit: 727fc3c108b070521a093337b930b8a3f8eeaf73 [1/8] mm: execmem: Pass an offset to execmem_set_direct_map_valid()
config: riscv-randconfig-r131-20260822 (https://download.01.org/0day-ci/archive/20260822/[email protected]/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260822/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   In file included from mm/execmem.c:22:
   In file included from mm/internal.h:13:
   In file included from include/linux/mm_inline.h:8:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:27:
   In file included from include/linux/kernel_stat.h:8:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:12:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
    1209 |         return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
         |                                                   ~~~~~~~~~~ ^
>> mm/execmem.c:91:26: error: call to undeclared function 'get_vm_area_page_order'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      91 |         unsigned int nr = (1 << get_vm_area_page_order(vm));
         |                                 ^
   mm/execmem.c:91:26: note: did you mean 'get_vm_area_caller'?
   include/linux/vmalloc.h:247:26: note: 'get_vm_area_caller' declared here
     247 | extern struct vm_struct *get_vm_area_caller(unsigned long size,
         |                          ^
   1 warning and 1 error generated.


vim +/get_vm_area_page_order +91 mm/execmem.c

    87	
    88	static int execmem_set_direct_map_valid(struct vm_struct *vm, bool valid,
    89						int offset)
    90	{
  > 91		unsigned int nr = (1 << get_vm_area_page_order(vm));
    92		unsigned int updated = 0;
    93		int err = 0;
    94	
    95		if (offset % nr)
    96			return -EINVAL;
    97	
    98		for (int i = offset >> PAGE_SHIFT; i < vm->nr_pages; i += nr) {
    99			err = set_direct_map_valid_noflush(vm->pages[i], nr, valid);
   100			if (err)
   101				goto err_restore;
   102			updated += nr;
   103		}
   104	
   105		return 0;
   106	
   107	err_restore:
   108		for (int i = offset >> PAGE_SHIFT; i < updated; i += nr)
   109			set_direct_map_valid_noflush(vm->pages[i], nr, !valid);
   110	
   111		return err;
   112	}
   113	

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