[linux-next:master 10286/12016] arch/arm64/mm/fixmap.c:199:10: warning: variable 'bm_pudp' set but not used

[kernel test robot <lkp@xxxxxxxxx>]

Hi Mark,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   d3f2cd24819158bb70701c3549e586f9df9cee67
commit: b97547761b02cc95e0e6be827dc9ca9da8142761 [10286/12016] arm64: mm: move fixmap code to its own file
config: arm64-buildonly-randconfig-r004-20230416 (https://download.01.org/0day-ci/archive/20230417/202304172004.r3IPh5Ja-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 9638da200e00bd069e6dd63604e14cbafede9324)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=b97547761b02cc95e0e6be827dc9ca9da8142761
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout b97547761b02cc95e0e6be827dc9ca9da8142761
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/mm/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202304172004.r3IPh5Ja-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> arch/arm64/mm/fixmap.c:199:10: warning: variable 'bm_pudp' set but not used [-Wunused-but-set-variable]
                   pud_t *bm_pudp;
                          ^
   1 warning generated.


vim +/bm_pudp +199 arch/arm64/mm/fixmap.c

   182	
   183	/*
   184	 * Copy the fixmap region into a new pgdir.
   185	 */
   186	void __init fixmap_copy(pgd_t *pgdir)
   187	{
   188		if (!READ_ONCE(pgd_val(*pgd_offset_pgd(pgdir, FIXADDR_TOT_START)))) {
   189			/*
   190			 * The fixmap falls in a separate pgd to the kernel, and doesn't
   191			 * live in the carveout for the swapper_pg_dir. We can simply
   192			 * re-use the existing dir for the fixmap.
   193			 */
   194			set_pgd(pgd_offset_pgd(pgdir, FIXADDR_TOT_START),
   195				READ_ONCE(*pgd_offset_k(FIXADDR_TOT_START)));
   196		} else if (CONFIG_PGTABLE_LEVELS > 3) {
   197			pgd_t *bm_pgdp;
   198			p4d_t *bm_p4dp;
 > 199			pud_t *bm_pudp;

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