arch/um/os-Linux/mem.c:28:6: warning: no previous prototype for 'kasan_map_memory'

[kernel test robot]

Hi Patricia,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6c1dd1fe5d8a1d43ed96e2e0ed44a88c73c5c039
commit: 5b301409e8bc5d7fad2ee138be44c5c529dd0874 UML: add support for KASAN under x86_64
date:   1 year, 6 months ago
config: um-x86_64_defconfig (https://download.01.org/0day-ci/archive/20240110/202401100849.Oik8AKkT-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240110/202401100849.Oik8AKkT-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401100849.Oik8AKkT-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> arch/um/os-Linux/mem.c:28:6: warning: no previous prototype for 'kasan_map_memory' [-Wmissing-prototypes]
      28 | void kasan_map_memory(void *start, size_t len)
         |      ^~~~~~~~~~~~~~~~
   arch/um/os-Linux/mem.c:212:13: warning: no previous prototype for 'check_tmpexec' [-Wmissing-prototypes]
     212 | void __init check_tmpexec(void)
         |             ^~~~~~~~~~~~~


vim +/kasan_map_memory +28 arch/um/os-Linux/mem.c

    19	
    20	/*
    21	 * kasan_map_memory - maps memory from @start with a size of @len.
    22	 * The allocated memory is filled with zeroes upon success.
    23	 * @start: the start address of the memory to be mapped
    24	 * @len: the length of the memory to be mapped
    25	 *
    26	 * This function is used to map shadow memory for KASAN in uml
    27	 */
  > 28	void kasan_map_memory(void *start, size_t len)
    29	{
    30		if (mmap(start,
    31			 len,
    32			 PROT_READ|PROT_WRITE,
    33			 MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE,
    34			 -1,
    35			 0) == MAP_FAILED) {
    36			os_info("Couldn't allocate shadow memory: %s\n.",
    37				strerror(errno));
    38			exit(1);
    39		}
    40	}
    41	

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