Hi Ankur,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/master]
[also build test ERROR on linus/master next-20201013]
[cannot apply to tip/x86/core linux/master v5.9]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Ankur-Arora/Use-uncached-writes-while-clearing-gigantic-pages/20201014-163720
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 80f92ca9b86c71450f003d39956fca4327cc5586
config: arm64-randconfig-r001-20201014 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project e7fe3c6dfede8d5781bd000741c3dea7088307a4)
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://github.com/0day-ci/linux/commit/6a1ec80588fc845c7ce6bd0e0e3635bf07d9110d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Ankur-Arora/Use-uncached-writes-while-clearing-gigantic-pages/20201014-163720
        git checkout 6a1ec80588fc845c7ce6bd0e0e3635bf07d9110d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from arch/arm64/kernel/asm-offsets.c:16:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:14:
   In file included from include/linux/blk-cgroup.h:23:
   In file included from include/linux/blkdev.h:13:
   In file included from include/linux/pagemap.h:11:
>> include/linux/highmem.h:240:2: error: implicit declaration of function 'clear_user_page_uncached' [-Werror,-Wimplicit-function-declaration]
           clear_user_page_uncached(addr, vaddr, page);
           ^
   include/linux/highmem.h:240:2: note: did you mean 'clear_user_highpage_uncached'?
   include/linux/highmem.h:236:20: note: 'clear_user_highpage_uncached' declared here
   static inline void clear_user_highpage_uncached(struct page *page, unsigned long vaddr)
                      ^
   1 error generated.
   make[2]: *** [scripts/Makefile.build:117: arch/arm64/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1198: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:185: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.

vim +/clear_user_page_uncached +240 include/linux/highmem.h

   234	
   235	#ifndef clear_user_highpage_uncached
   236	static inline void clear_user_highpage_uncached(struct page *page, unsigned long vaddr)
   237	{
   238		void *addr = kmap_atomic(page);
   239	
 > 240		clear_user_page_uncached(addr, vaddr, page);
   241		kunmap_atomic(addr);
   242	}
   243	#endif
   244	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org