On Sat, Dec 08, 2018 at 09:42:29AM +0800, kbuild test robot wrote: >Hi Wei, > >Thank you for the patch! Perhaps something to improve: > >[auto build test WARNING on linus/master] >[also build test WARNING on v4.20-rc5 next-20181207] >[if your patch is applied to the wrong git tree, please drop us a note to help improve the system] > >url: https://github.com/0day-ci/linux/commits/Wei-Yang/mm-pageblock-make-sure-pageblock-won-t-exceed-mem_sectioin/20181207-030601 >config: powerpc-allmodconfig (attached as .config) >compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 >reproduce: > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # save the attached .config to linux build tree > GCC_VERSION=7.2.0 make.cross ARCH=powerpc > >All warnings (new ones prefixed by >>): > > In file included from include/linux/gfp.h:6:0, > from include/linux/xarray.h:14, > from include/linux/radix-tree.h:31, > from include/linux/fs.h:15, > from include/linux/compat.h:17, > from arch/powerpc/kernel/asm-offsets.c:16: >>> include/linux/mmzone.h:1088:6: warning: "pageblock_order" is not defined, evaluates to 0 [-Wundef] > #if (pageblock_order + PAGE_SHIFT) > SECTION_SIZE_BITS > ^~~~~~~~~~~~~~~ >-- > In file included from include/linux/gfp.h:6:0, > from include/linux/mm.h:10, > from mm//swap.c:16: >>> include/linux/mmzone.h:1088:6: warning: "pageblock_order" is not defined, evaluates to 0 [-Wundef] > #if (pageblock_order + PAGE_SHIFT) > SECTION_SIZE_BITS > ^~~~~~~~~~~~~~~ > In file included from include/linux/gfp.h:6:0, > from include/linux/mm.h:10, > from mm//swap.c:16: >>> include/linux/mmzone.h:1088:6: warning: "pageblock_order" is not defined, evaluates to 0 [-Wundef] > #if (pageblock_order + PAGE_SHIFT) > SECTION_SIZE_BITS > ^~~~~~~~~~~~~~~ > >vim +/pageblock_order +1088 include/linux/mmzone.h > > 1087 >> 1088 #if (pageblock_order + PAGE_SHIFT) > SECTION_SIZE_BITS > 1089 #error Allocator pageblock_order exceeds SECTION_SIZE > 1090 #endif > 1091 > I took a look at the latest code, at line 1082 of the same file uses pageblock_order. And I apply this patch on top of v4.20-rc5, the build looks good to me. Confused why this introduce an compile error. >--- >0-DAY kernel test infrastructure Open Source Technology Center >https://lists.01.org/pipermail/kbuild-all Intel Corporation -- Wei Yang Help you, Help me
