Hi Yang, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on mmotm/master] [also build test WARNING on v5.4-rc7 next-20191112] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Yang-Shi/mm-migrate-handle-freed-page-at-the-first-place/20191113-044923 base: git://git.cmpxchg.org/linux-mmotm.git master config: x86_64-rhel-7.6-kasan (attached as .config) compiler: gcc-7 (Debian 7.4.0-14) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): In file included from include/asm-generic/bug.h:5:0, from arch/x86/include/asm/bug.h:83, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:9, from include/linux/migrate.h:5, from mm/migrate.c:16: mm/migrate.c: In function 'migrate_pages': >> include/linux/compiler.h:188:26: warning: 'newpage' may be used uninitialized in this function [-Wmaybe-uninitialized] case 8: *(__u64 *)res = *(volatile __u64 *)p; break; \ ^ mm/migrate.c:1170:15: note: 'newpage' was declared here struct page *newpage; ^~~~~~~ vim +/newpage +188 include/linux/compiler.h 230fa253df6352 Christian Borntraeger 2014-11-25 181 d976441f44bc5d Andrey Ryabinin 2015-10-19 182 #define __READ_ONCE_SIZE \ d976441f44bc5d Andrey Ryabinin 2015-10-19 183 ({ \ d976441f44bc5d Andrey Ryabinin 2015-10-19 184 switch (size) { \ d976441f44bc5d Andrey Ryabinin 2015-10-19 185 case 1: *(__u8 *)res = *(volatile __u8 *)p; break; \ d976441f44bc5d Andrey Ryabinin 2015-10-19 186 case 2: *(__u16 *)res = *(volatile __u16 *)p; break; \ d976441f44bc5d Andrey Ryabinin 2015-10-19 187 case 4: *(__u32 *)res = *(volatile __u32 *)p; break; \ d976441f44bc5d Andrey Ryabinin 2015-10-19 @188 case 8: *(__u64 *)res = *(volatile __u64 *)p; break; \ d976441f44bc5d Andrey Ryabinin 2015-10-19 189 default: \ d976441f44bc5d Andrey Ryabinin 2015-10-19 190 barrier(); \ d976441f44bc5d Andrey Ryabinin 2015-10-19 191 __builtin_memcpy((void *)res, (const void *)p, size); \ d976441f44bc5d Andrey Ryabinin 2015-10-19 192 barrier(); \ d976441f44bc5d Andrey Ryabinin 2015-10-19 193 } \ d976441f44bc5d Andrey Ryabinin 2015-10-19 194 }) d976441f44bc5d Andrey Ryabinin 2015-10-19 195 :::::: The code at line 188 was first introduced by commit :::::: d976441f44bc5d48635d081d277aa76556ffbf8b compiler, atomics, kasan: Provide READ_ONCE_NOCHECK() :::::: TO: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> :::::: CC: Ingo Molnar <mingo@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx Intel Corporation
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