Hi Nicholas, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.14-rc3 next-20210723] [cannot apply to powerpc/next] [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/Nicholas-Piggin/KVM-PPC-Book3S-HV-P9-entry-exit-optimisations/20210726-115329 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git ff1176468d368232b684f75e82563369208bc371 config: powerpc64-randconfig-r024-20210726 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project c63dbd850182797bc4b76124d08e1c320ab2365d) 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://github.com/0day-ci/linux/commit/d173e4690cf13578686dbbce48e1f81e925b96af git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Nicholas-Piggin/KVM-PPC-Book3S-HV-P9-entry-exit-optimisations/20210726-115329 git checkout d173e4690cf13578686dbbce48e1f81e925b96af # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/kernel/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): arch/powerpc/include/asm/io-defs.h:45:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:121:1: note: expanded from here __do_insw ^ arch/powerpc/include/asm/io.h:557:56: 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 arch/powerpc/kernel/process.c:28: In file included from include/linux/init_task.h:9: In file included from include/linux/ftrace.h:10: In file included from include/linux/trace_recursion.h:5: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: 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:619: arch/powerpc/include/asm/io-defs.h:47:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:123:1: note: expanded from here __do_insl ^ arch/powerpc/include/asm/io.h:558:56: 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 arch/powerpc/kernel/process.c:28: In file included from include/linux/init_task.h:9: In file included from include/linux/ftrace.h:10: In file included from include/linux/trace_recursion.h:5: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: 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:619: arch/powerpc/include/asm/io-defs.h:49:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:125:1: note: expanded from here __do_outsb ^ arch/powerpc/include/asm/io.h:559:58: 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 arch/powerpc/kernel/process.c:28: In file included from include/linux/init_task.h:9: In file included from include/linux/ftrace.h:10: In file included from include/linux/trace_recursion.h:5: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: 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:619: arch/powerpc/include/asm/io-defs.h:51:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:127:1: note: expanded from here __do_outsw ^ arch/powerpc/include/asm/io.h:560:58: 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 arch/powerpc/kernel/process.c:28: In file included from include/linux/init_task.h:9: In file included from include/linux/ftrace.h:10: In file included from include/linux/trace_recursion.h:5: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: 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:619: arch/powerpc/include/asm/io-defs.h:53:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:129:1: note: expanded from here __do_outsl ^ arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl' #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ >> arch/powerpc/kernel/process.c:612:33: error: no member named 'tm_tfhar' in 'struct thread_struct' current->thread.tm_tfhar = mfspr(SPRN_TFHAR); ~~~~~~~~~~~~~~~ ^ >> arch/powerpc/kernel/process.c:613:33: error: no member named 'tm_tfiar' in 'struct thread_struct' current->thread.tm_tfiar = mfspr(SPRN_TFIAR); ~~~~~~~~~~~~~~~ ^ >> arch/powerpc/kernel/process.c:614:33: error: no member named 'tm_texasr' in 'struct thread_struct' current->thread.tm_texasr = mfspr(SPRN_TEXASR); ~~~~~~~~~~~~~~~ ^ >> arch/powerpc/kernel/process.c:596:6: error: no previous prototype for function 'save_user_regs_kvm' [-Werror,-Wmissing-prototypes] void save_user_regs_kvm(void) ^ arch/powerpc/kernel/process.c:596:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void save_user_regs_kvm(void) ^ static 16 errors generated. vim +612 arch/powerpc/kernel/process.c 595 > 596 void save_user_regs_kvm(void) 597 { 598 unsigned long usermsr; 599 600 if (!current->thread.regs) 601 return; 602 603 usermsr = current->thread.regs->msr; 604 605 if (usermsr & MSR_FP) 606 save_fpu(current); 607 608 if (usermsr & MSR_VEC) 609 save_altivec(current); 610 611 if (usermsr & MSR_TM) { > 612 current->thread.tm_tfhar = mfspr(SPRN_TFHAR); > 613 current->thread.tm_tfiar = mfspr(SPRN_TFIAR); > 614 current->thread.tm_texasr = mfspr(SPRN_TEXASR); 615 current->thread.regs->msr &= ~MSR_TM; 616 } 617 } 618 EXPORT_SYMBOL_GPL(save_user_regs_kvm); 619 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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