tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 8db5efb83fa99e81c3f8dee92a6589b251f117f3 commit: 4d45e75a9955ade5c2f49bd96fc4173b2cec9a72 mm: remove the now-unnecessary mmget_still_valid() hack date: 6 months ago config: powerpc64-randconfig-r021-20210423 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 06234f758e1945084582cf80450b396f75a9c06e) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4d45e75a9955ade5c2f49bd96fc4173b2cec9a72 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 4d45e75a9955ade5c2f49bd96fc4173b2cec9a72 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:53:1: note: expanded from here __do_insw ^ arch/powerpc/include/asm/io.h:542:56: note: expanded from macro '__do_insw' #define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from mm/khugepaged.c:9: In file included from include/linux/rmap.h:12: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:604: arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:58:1: note: expanded from here __do_insl ^ arch/powerpc/include/asm/io.h:543:56: note: expanded from macro '__do_insl' #define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from mm/khugepaged.c:9: In file included from include/linux/rmap.h:12: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:604: arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:63:1: note: expanded from here __do_outsb ^ arch/powerpc/include/asm/io.h:544:58: note: expanded from macro '__do_outsb' #define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from mm/khugepaged.c:9: In file included from include/linux/rmap.h:12: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:604: arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:68:1: note: expanded from here __do_outsw ^ arch/powerpc/include/asm/io.h:545:58: note: expanded from macro '__do_outsw' #define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from mm/khugepaged.c:9: In file included from include/linux/rmap.h:12: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:604: arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:73:1: note: expanded from here __do_outsl ^ arch/powerpc/include/asm/io.h:546:58: note: expanded from macro '__do_outsl' #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ >> mm/khugepaged.c:2181:13: warning: stack frame size of 2832 bytes in function 'khugepaged_do_scan' [-Wframe-larger-than=] static void khugepaged_do_scan(void) ^ 13 warnings generated. vim +/khugepaged_do_scan +2181 mm/khugepaged.c b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2180 b46e756f5e4703 Kirill A. Shutemov 2016-07-26 @2181 static void khugepaged_do_scan(void) b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2182 { b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2183 struct page *hpage = NULL; b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2184 unsigned int progress = 0, pass_through_head = 0; b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2185 unsigned int pages = khugepaged_pages_to_scan; b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2186 bool wait = true; b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2187 b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2188 barrier(); /* write khugepaged_pages_to_scan to local stack */ b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2189 a980df33e9351e Kirill A. Shutemov 2020-06-03 2190 lru_add_drain_all(); a980df33e9351e Kirill A. Shutemov 2020-06-03 2191 b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2192 while (progress < pages) { b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2193 if (!khugepaged_prealloc_page(&hpage, &wait)) b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2194 break; b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2195 b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2196 cond_resched(); b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2197 b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2198 if (unlikely(kthread_should_stop() || try_to_freeze())) b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2199 break; b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2200 b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2201 spin_lock(&khugepaged_mm_lock); b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2202 if (!khugepaged_scan.mm_slot) b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2203 pass_through_head++; b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2204 if (khugepaged_has_work() && b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2205 pass_through_head < 2) b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2206 progress += khugepaged_scan_mm_slot(pages - progress, b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2207 &hpage); b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2208 else b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2209 progress = pages; b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2210 spin_unlock(&khugepaged_mm_lock); b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2211 } b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2212 b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2213 if (!IS_ERR_OR_NULL(hpage)) b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2214 put_page(hpage); b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2215 } b46e756f5e4703 Kirill A. Shutemov 2016-07-26 2216 :::::: The code at line 2181 was first introduced by commit :::::: b46e756f5e47031c67658ff036e5ffe27062fa43 thp: extract khugepaged from mm/huge_memory.c :::::: TO: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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