Hi, I love your patch! Perhaps something to improve: [auto build test WARNING on hch-configfs/for-next] [also build test WARNING on linus/master hnaz-linux-mm/master v5.10-rc7] [cannot apply to mmotm/master next-20201210] [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/ira-weiny-intel-com/mm-highmem-R... base: git://git.infradead.org/users/hch/configfs.git for-next config: i386-randconfig-s001-20201210 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-179-ga00755aa-dirty # https://github.com/0day-ci/linux/commit/9580f83142cf2df75ceb9e7dbe1939012... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review ira-weiny-intel-com/mm-highmem-Remove-deprecated-kmap_atomic/20201211-021920 git checkout 9580f83142cf2df75ceb9e7dbe1939012818722c # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from include/linux/pagemap.h:11, from include/linux/blkdev.h:14, from include/linux/blk-cgroup.h:23, from include/linux/writeback.h:14, from include/linux/memcontrol.h:22, from include/linux/swap.h:9, from include/linux/suspend.h:5, from arch/x86/kernel/asm-offsets.c:13: include/linux/highmem.h: In function 'clear_user_highpage': include/linux/highmem.h:229:15: error: implicit declaration of function 'kmap_local_page'; did you mean 'kmap_to_page'? [-Werror=implicit-function-declaration] 229 | void *addr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ | kmap_to_page include/linux/highmem.h:229:15: warning: initialization of 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion] include/linux/highmem.h:231:2: error: implicit declaration of function 'kunmap_local' [-Werror=implicit-function-declaration] 231 | kunmap_local(addr); | ^~~~~~~~~~~~ include/linux/highmem.h: In function 'clear_highpage': include/linux/highmem.h:282:16: warning: initialization of 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 282 | void *kaddr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'zero_user_segments': include/linux/highmem.h:291:16: warning: initialization of 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 291 | void *kaddr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'copy_user_highpage': include/linux/highmem.h:324:8: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 324 | vfrom = kmap_local_page(from); | ^ include/linux/highmem.h:325:6: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 325 | vto = kmap_local_page(to); | ^ include/linux/highmem.h: In function 'copy_highpage': include/linux/highmem.h:339:8: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 339 | vfrom = kmap_local_page(from); | ^ include/linux/highmem.h:340:6: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 340 | vto = kmap_local_page(to); | ^ include/linux/highmem.h: In function 'memcpy_page': 352 | char *dst = kmap_local_page(dst_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h:353:14: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 353 | char *src = kmap_local_page(src_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memmove_page': include/linux/highmem.h:365:14: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 365 | char *dst = kmap_local_page(dst_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h:366:14: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 366 | char *src = kmap_local_page(src_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memcpy_from_page': include/linux/highmem.h:376:15: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 376 | char *from = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memcpy_to_page': include/linux/highmem.h:385:13: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 385 | char *to = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memset_page': include/linux/highmem.h:394:15: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 394 | char *addr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors -- In file included from include/linux/pagemap.h:11, from include/linux/blkdev.h:14, from include/linux/blk-cgroup.h:23, from include/linux/writeback.h:14, from include/linux/memcontrol.h:22, from include/linux/swap.h:9, from include/linux/suspend.h:5, from arch/x86/kernel/asm-offsets.c:13: include/linux/highmem.h: In function 'clear_user_highpage': include/linux/highmem.h:229:15: error: implicit declaration of function 'kmap_local_page'; did you mean 'kmap_to_page'? [-Werror=implicit-function-declaration] 229 | void *addr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ | kmap_to_page include/linux/highmem.h:229:15: warning: initialization of 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion] include/linux/highmem.h:231:2: error: implicit declaration of function 'kunmap_local' [-Werror=implicit-function-declaration] 231 | kunmap_local(addr); | ^~~~~~~~~~~~ include/linux/highmem.h: In function 'clear_highpage': include/linux/highmem.h:282:16: warning: initialization of 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 282 | void *kaddr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'zero_user_segments': include/linux/highmem.h:291:16: warning: initialization of 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 291 | void *kaddr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'copy_user_highpage': include/linux/highmem.h:324:8: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 324 | vfrom = kmap_local_page(from); | ^ include/linux/highmem.h:325:6: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 325 | vto = kmap_local_page(to); | ^ include/linux/highmem.h: In function 'copy_highpage': include/linux/highmem.h:339:8: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 339 | vfrom = kmap_local_page(from); | ^ include/linux/highmem.h:340:6: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 340 | vto = kmap_local_page(to); | ^ include/linux/highmem.h: In function 'memcpy_page': 352 | char *dst = kmap_local_page(dst_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h:353:14: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 353 | char *src = kmap_local_page(src_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memmove_page': include/linux/highmem.h:365:14: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 365 | char *dst = kmap_local_page(dst_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h:366:14: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 366 | char *src = kmap_local_page(src_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memcpy_from_page': include/linux/highmem.h:376:15: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 376 | char *from = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memcpy_to_page': include/linux/highmem.h:385:13: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 385 | char *to = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memset_page': include/linux/highmem.h:394:15: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 394 | char *addr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors make[2]: *** [scripts/Makefile.build:117: arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1200: prepare0] Error 2 make[1]: Target 'modules_prepare' not remade because of errors. make: *** [Makefile:185: __sub-make] Error 2 make: Target 'modules_prepare' not remade because of errors. -- In file included from include/linux/pagemap.h:11, from include/linux/blkdev.h:14, from include/linux/blk-cgroup.h:23, from include/linux/writeback.h:14, from include/linux/memcontrol.h:22, from include/linux/swap.h:9, from include/linux/suspend.h:5, from arch/x86/kernel/asm-offsets.c:13: include/linux/highmem.h: In function 'clear_user_highpage': include/linux/highmem.h:229:15: error: implicit declaration of function 'kmap_local_page'; did you mean 'kmap_to_page'? [-Werror=implicit-function-declaration] 229 | void *addr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ | kmap_to_page include/linux/highmem.h:229:15: warning: initialization of 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion] include/linux/highmem.h:231:2: error: implicit declaration of function 'kunmap_local' [-Werror=implicit-function-declaration] 231 | kunmap_local(addr); | ^~~~~~~~~~~~ include/linux/highmem.h: In function 'clear_highpage': include/linux/highmem.h:282:16: warning: initialization of 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 282 | void *kaddr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'zero_user_segments': include/linux/highmem.h:291:16: warning: initialization of 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 291 | void *kaddr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'copy_user_highpage': include/linux/highmem.h:324:8: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 324 | vfrom = kmap_local_page(from); | ^ include/linux/highmem.h:325:6: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 325 | vto = kmap_local_page(to); | ^ include/linux/highmem.h: In function 'copy_highpage': include/linux/highmem.h:339:8: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 339 | vfrom = kmap_local_page(from); | ^ include/linux/highmem.h:340:6: warning: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 340 | vto = kmap_local_page(to); | ^ include/linux/highmem.h: In function 'memcpy_page': 352 | char *dst = kmap_local_page(dst_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h:353:14: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 353 | char *src = kmap_local_page(src_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memmove_page': include/linux/highmem.h:365:14: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 365 | char *dst = kmap_local_page(dst_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h:366:14: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 366 | char *src = kmap_local_page(src_page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memcpy_from_page': include/linux/highmem.h:376:15: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 376 | char *from = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memcpy_to_page': include/linux/highmem.h:385:13: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 385 | char *to = kmap_local_page(page); | ^~~~~~~~~~~~~~~ include/linux/highmem.h: In function 'memset_page': include/linux/highmem.h:394:15: warning: initialization of 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion] 394 | char *addr = kmap_local_page(page); | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors make[2]: *** [scripts/Makefile.build:117: arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1200: 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 +352 include/linux/highmem.h 334 335 static inline void copy_highpage(struct page *to, struct page *from) 336 { 337 char *vfrom, *vto; 338 340 vto = kmap_local_page(to); 341 copy_page(vto, vfrom); 342 kunmap_local(vto); 343 kunmap_local(vfrom); 344 } 345 346 #endif 347 348 static inline void memcpy_page(struct page *dst_page, size_t dst_off, 349 struct page *src_page, size_t src_off, 350 size_t len) 351 { 353 char *src = kmap_local_page(src_page); 354 355 BUG_ON(dst_off + len > PAGE_SIZE || src_off + len > PAGE_SIZE); 356 memcpy(dst + dst_off, src + src_off, len); 357 kunmap_local(src); 358 kunmap_local(dst); 359 } 360 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org