Hi "Aneesh, I love your patch! Perhaps something to improve: [auto build test WARNING on powerpc/next] [also build test WARNING on asm-generic/master tip/x86/mm linus/master sparc/master v5.13-rc6 next-20210615] [cannot apply to hnaz-linux-mm/master sparc-next/master] [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/Aneesh-Kumar-K-V/mm-rename-pud_p... base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next config: alpha-randconfig-r026-20210615 (attached as .config) compiler: alpha-linux-gcc (GCC) 9.3.0 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 # https://github.com/0day-ci/linux/commit/8af9180cf61ec19f32f0594a59277d0ca... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Aneesh-Kumar-K-V/mm-rename-pud_page_vaddr-to-pud_pgtable-and-make-it-return-pmd_t/20210616-162847 git checkout 8af9180cf61ec19f32f0594a59277d0cabff5317 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha 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 >>): arch/alpha/kernel/asm-offsets.c:15:6: warning: no previous prototype for 'foo' [-Wmissing-prototypes] 15 | void foo(void) | ^~~ In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from include/linux/pid_namespace.h:7, from include/linux/ptrace.h:10, from arch/alpha/kernel/asm-offsets.c:11: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ -- In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from arch/alpha/include/asm/io.h:8, from include/linux/io.h:13, from include/linux/irq.h:20, from arch/alpha/kernel/irq_srm.c:8: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ -- arch/alpha/kernel/traps.c:212:1: warning: no previous prototype for 'do_entArith' [-Wmissing-prototypes] 212 | do_entArith(unsigned long summary, unsigned long write_mask, | ^~~~~~~~~~~ arch/alpha/kernel/traps.c:234:1: warning: no previous prototype for 'do_entIF' [-Wmissing-prototypes] 234 | do_entIF(unsigned long type, struct pt_regs *regs) | ^~~~~~~~ arch/alpha/kernel/traps.c:401:1: warning: no previous prototype for 'do_entDbg' [-Wmissing-prototypes] 401 | do_entDbg(struct pt_regs *regs) | ^~~~~~~~~ arch/alpha/kernel/traps.c:437:1: warning: no previous prototype for 'do_entUna' [-Wmissing-prototypes] 437 | do_entUna(void * va, unsigned long opcode, unsigned long reg, | ^~~~~~~~~ arch/alpha/kernel/traps.c:722:1: warning: no previous prototype for 'do_entUnaUser' [-Wmissing-prototypes] 722 | do_entUnaUser(void __user * va, unsigned long opcode, | ^~~~~~~~~~~~~ arch/alpha/kernel/traps.c:977:1: warning: no previous prototype for 'trap_init' [-Wmissing-prototypes] 977 | trap_init(void) | ^~~~~~~~~ In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from arch/alpha/kernel/traps.c:13: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ -- arch/alpha/kernel/process.c:57:6: warning: no previous prototype for 'arch_cpu_idle' [-Wmissing-prototypes] 57 | void arch_cpu_idle(void) | ^~~~~~~~~~~~~ arch/alpha/kernel/process.c:63:6: warning: no previous prototype for 'arch_cpu_idle_dead' [-Wmissing-prototypes] 63 | void arch_cpu_idle_dead(void) | ^~~~~~~~~~~~~~~~~~ In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from arch/alpha/kernel/process.c:19: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ -- arch/alpha/kernel/irq.c:96:1: warning: no previous prototype for 'handle_irq' [-Wmissing-prototypes] 96 | handle_irq(int irq) | ^~~~~~~~~~ In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from arch/alpha/include/asm/io.h:8, from include/linux/io.h:13, from include/linux/irq.h:20, from include/asm-generic/hardirq.h:17, from arch/alpha/include/asm/hardirq.h:8, from include/linux/hardirq.h:11, from include/linux/interrupt.h:11, from include/linux/kernel_stat.h:9, from arch/alpha/kernel/irq.c:17: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ -- arch/alpha/kernel/irq_alpha.c:45:1: warning: no previous prototype for 'do_entInt' [-Wmissing-prototypes] 45 | do_entInt(unsigned long type, unsigned long vector, | ^~~~~~~~~ arch/alpha/kernel/irq_alpha.c:103:1: warning: no previous prototype for 'init_IRQ' [-Wmissing-prototypes] 103 | init_IRQ(void) | ^~~~~~~~ In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from arch/alpha/include/asm/io.h:8, from include/linux/io.h:13, from include/linux/irq.h:20, from arch/alpha/kernel/irq_alpha.c:8: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ -- arch/alpha/kernel/signal.c:204:1: warning: no previous prototype for 'do_sigreturn' [-Wmissing-prototypes] 204 | do_sigreturn(struct sigcontext __user *sc) | ^~~~~~~~~~~~ arch/alpha/kernel/signal.c:232:1: warning: no previous prototype for 'do_rt_sigreturn' [-Wmissing-prototypes] 232 | do_rt_sigreturn(struct rt_sigframe __user *frame) | ^~~~~~~~~~~~~~~ arch/alpha/kernel/signal.c:522:1: warning: no previous prototype for 'do_work_pending' [-Wmissing-prototypes] 522 | do_work_pending(struct pt_regs *regs, unsigned long thread_flags, | ^~~~~~~~~~~~~~~ In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from include/linux/pid_namespace.h:7, from include/linux/ptrace.h:10, from arch/alpha/kernel/signal.c:16: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ -- arch/alpha/kernel/setup.c:289:1: warning: no previous prototype for 'move_initrd' [-Wmissing-prototypes] 289 | move_initrd(unsigned long mem_limit) | ^~~~~~~~~~~ In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from arch/alpha/kernel/setup.c:16: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ -- arch/alpha/kernel/ptrace.c:321:26: warning: no previous prototype for 'syscall_trace_enter' [-Wmissing-prototypes] 321 | asmlinkage unsigned long syscall_trace_enter(void) | ^~~~~~~~~~~~~~~~~~~ arch/alpha/kernel/ptrace.c:333:1: warning: no previous prototype for 'syscall_trace_leave' [-Wmissing-prototypes] 333 | syscall_trace_leave(void) | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from arch/alpha/kernel/ptrace.c:11: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ -- arch/alpha/kernel/time.c:64:6: warning: no previous prototype for 'arch_irq_work_raise' [-Wmissing-prototypes] 64 | void arch_irq_work_raise(void) | ^~~~~~~~~~~~~~~~~~~ arch/alpha/kernel/time.c:390:1: warning: no previous prototype for 'time_init' [-Wmissing-prototypes] 390 | time_init(void) | ^~~~~~~~~ In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from arch/alpha/kernel/time.c:28: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ -- arch/alpha/kernel/io.c:637:1: warning: no previous prototype for 'scr_memcpyw' [-Wmissing-prototypes] 637 | scr_memcpyw(u16 *d, const u16 *s, unsigned int count) | ^~~~~~~~~~~ In file included from include/linux/pgtable.h:6, from include/linux/mm.h:33, from arch/alpha/include/asm/io.h:8, from arch/alpha/kernel/io.c:10: 295 | pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); | ^~~~~~~~~~~ .. vim +295 arch/alpha/include/asm/pgtable.h 278 279 /* 280 * The smp_rmb() in the following functions are required to order the load of 281 * *dir (the pointer in the top level page table) with any subsequent load of 282 * the returned pmd_t *ret (ret is data dependent on *dir). 283 * 284 * If this ordering is not enforced, the CPU might load an older value of 285 * *ret, which may be uninitialized data. See mm/memory.c:__pte_alloc for 286 * more details. 287 * 288 * Note that we never change the mm->pgd pointer after the task is running, so 289 * pgd_offset does not require such a barrier. 290 */ 291 292 /* Find an entry in the second-level page table.. */ 293 extern inline pmd_t * pmd_offset(pud_t * dir, unsigned long address) 294 { 296 smp_rmb(); /* see above */ 297 return ret; 298 } 299 #define pmd_offset pmd_offset 300 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org