[akpm-mm:mm-unstable 302/323] arch/x86/mm/pgprot.c:26:6: warning: no previous prototype for 'add_encrypt_protection_map'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   706370e5c2ea7bb4544eee6e1172c4d68117a526
commit: d845587c05fd4ae52aaa0cd5c8939e8f4793301f [302/323] x86/mm: move protection_map[] inside the platform
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20220702/202207021647.Jb0wNWF5-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?id=d845587c05fd4ae52aaa0cd5c8939e8f4793301f
        git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
        git fetch --no-tags akpm-mm mm-unstable
        git checkout d845587c05fd4ae52aaa0cd5c8939e8f4793301f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/mm/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> arch/x86/mm/pgprot.c:26:6: warning: no previous prototype for 'add_encrypt_protection_map' [-Wmissing-prototypes]
      26 | void add_encrypt_protection_map(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/add_encrypt_protection_map +26 arch/x86/mm/pgprot.c

    25	
  > 26	void add_encrypt_protection_map(void)
    27	{
    28		unsigned int i;
    29	
    30		for (i = 0; i < ARRAY_SIZE(protection_map); i++)
    31			protection_map[i] = pgprot_encrypted(protection_map[i]);
    32	}
    33	

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