tree: https://github.com/hnaz/linux-mm master head: 2bbf0589bfeb27800c730b76eacf34528eee5418 commit: 47dde7dbc279f3698c76a7b92ac0d0f1913539af [476/523] powerpc: add support for folded p4d page tables config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 47dde7dbc279f3698c76a7b92ac0d0f1913539af # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): arch/powerpc/xmon/xmon.c: In function 'show_pte': 3138 | pgd_t *pgdp, *pgdir; | ^~~~~ arch/powerpc/xmon/xmon.c: At top level: arch/powerpc/xmon/xmon.c:4122:1: warning: no previous prototype for 'spu_inst_dump' [-Wmissing-prototypes] 4122 | spu_inst_dump(unsigned long adr, long count, int praddr) | ^~~~~~~~~~~~~ arch/powerpc/xmon/xmon.c: In function 'xmon_print_symbol': arch/powerpc/xmon/xmon.c:3557:14: warning: variable 'name' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered] 3557 | const char *name = NULL; | ^~~~ arch/powerpc/xmon/xmon.c: In function 'stop_spus': arch/powerpc/xmon/xmon.c:3990:6: warning: variable 'i' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered] 3990 | int i; | ^ arch/powerpc/xmon/xmon.c: In function 'restart_spus': arch/powerpc/xmon/xmon.c:4031:6: warning: variable 'i' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered] 4031 | int i; | ^ arch/powerpc/xmon/xmon.c: In function 'dump_opal_msglog': arch/powerpc/xmon/xmon.c:2937:9: warning: variable 'pos' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered] 2937 | loff_t pos = 0; | ^~~ arch/powerpc/xmon/xmon.c: In function 'show_pte': arch/powerpc/xmon/xmon.c:3136:22: warning: variable 'tsk' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered] 3136 | struct task_struct *tsk = NULL; | ^~~ arch/powerpc/xmon/xmon.c: In function 'show_tasks': arch/powerpc/xmon/xmon.c:3234:22: warning: variable 'tsk' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered] 3234 | struct task_struct *tsk = NULL; | ^~~ arch/powerpc/xmon/xmon.c: In function 'xmon_core': arch/powerpc/xmon/xmon.c:490:6: warning: variable 'cmd' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered] 490 | int cmd = 0; | ^~~ arch/powerpc/xmon/xmon.c:849:14: warning: variable 'bp' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered] 849 | struct bpt *bp; | ^~ arch/powerpc/xmon/xmon.c:849:14: warning: variable 'bp' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered] arch/powerpc/xmon/xmon.c:488:48: warning: argument 'fromipi' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered] 488 | static int xmon_core(struct pt_regs *regs, int fromipi) | ~~~~^~~~~~~ vim +/pgdir +3138 arch/powerpc/xmon/xmon.c 80eff6c4847997 Balbir Singh 2017-10-30 3132 80eff6c4847997 Balbir Singh 2017-10-30 3133 static void show_pte(unsigned long addr) 80eff6c4847997 Balbir Singh 2017-10-30 3134 { 80eff6c4847997 Balbir Singh 2017-10-30 3135 unsigned long tskv = 0; 80eff6c4847997 Balbir Singh 2017-10-30 3136 struct task_struct *tsk = NULL; 80eff6c4847997 Balbir Singh 2017-10-30 3137 struct mm_struct *mm; 80eff6c4847997 Balbir Singh 2017-10-30 @3138 pgd_t *pgdp, *pgdir; 47dde7dbc279f3 Mike Rapoport 2020-05-16 3139 p4d_t *p4dp; 80eff6c4847997 Balbir Singh 2017-10-30 3140 pud_t *pudp; 80eff6c4847997 Balbir Singh 2017-10-30 3141 pmd_t *pmdp; 80eff6c4847997 Balbir Singh 2017-10-30 3142 pte_t *ptep; 80eff6c4847997 Balbir Singh 2017-10-30 3143 80eff6c4847997 Balbir Singh 2017-10-30 3144 if (!scanhex(&tskv)) 80eff6c4847997 Balbir Singh 2017-10-30 3145 mm = &init_mm; 80eff6c4847997 Balbir Singh 2017-10-30 3146 else 80eff6c4847997 Balbir Singh 2017-10-30 3147 tsk = (struct task_struct *)tskv; 80eff6c4847997 Balbir Singh 2017-10-30 3148 80eff6c4847997 Balbir Singh 2017-10-30 3149 if (tsk == NULL) 80eff6c4847997 Balbir Singh 2017-10-30 3150 mm = &init_mm; 80eff6c4847997 Balbir Singh 2017-10-30 3151 else 80eff6c4847997 Balbir Singh 2017-10-30 3152 mm = tsk->active_mm; 80eff6c4847997 Balbir Singh 2017-10-30 3153 80eff6c4847997 Balbir Singh 2017-10-30 3154 if (setjmp(bus_error_jmp) != 0) { 80eff6c4847997 Balbir Singh 2017-10-30 3155 catch_memory_errors = 0; d8104182087319 Michael Ellerman 2017-12-06 3156 printf("*** Error dumping pte for task %px\n", tsk); 80eff6c4847997 Balbir Singh 2017-10-30 3157 return; 80eff6c4847997 Balbir Singh 2017-10-30 3158 } 80eff6c4847997 Balbir Singh 2017-10-30 3159 80eff6c4847997 Balbir Singh 2017-10-30 3160 catch_memory_errors = 1; 80eff6c4847997 Balbir Singh 2017-10-30 3161 sync(); 80eff6c4847997 Balbir Singh 2017-10-30 3162 80eff6c4847997 Balbir Singh 2017-10-30 3163 if (mm == &init_mm) { 80eff6c4847997 Balbir Singh 2017-10-30 3164 pgdp = pgd_offset_k(addr); 80eff6c4847997 Balbir Singh 2017-10-30 3165 pgdir = pgd_offset_k(0); 80eff6c4847997 Balbir Singh 2017-10-30 3166 } else { 80eff6c4847997 Balbir Singh 2017-10-30 3167 pgdp = pgd_offset(mm, addr); 80eff6c4847997 Balbir Singh 2017-10-30 3168 pgdir = pgd_offset(mm, 0); 80eff6c4847997 Balbir Singh 2017-10-30 3169 } 80eff6c4847997 Balbir Singh 2017-10-30 3170 47dde7dbc279f3 Mike Rapoport 2020-05-16 3171 p4dp = p4d_offset(pgdp, addr); 47dde7dbc279f3 Mike Rapoport 2020-05-16 3172 47dde7dbc279f3 Mike Rapoport 2020-05-16 3173 if (p4d_none(*p4dp)) { 47dde7dbc279f3 Mike Rapoport 2020-05-16 3174 printf("No valid P4D\n"); 80eff6c4847997 Balbir Singh 2017-10-30 3175 return; 80eff6c4847997 Balbir Singh 2017-10-30 3176 } 80eff6c4847997 Balbir Singh 2017-10-30 3177 47dde7dbc279f3 Mike Rapoport 2020-05-16 3178 if (p4d_is_leaf(*p4dp)) { 47dde7dbc279f3 Mike Rapoport 2020-05-16 3179 format_pte(p4dp, p4d_val(*p4dp)); 80eff6c4847997 Balbir Singh 2017-10-30 3180 return; 80eff6c4847997 Balbir Singh 2017-10-30 3181 } 80eff6c4847997 Balbir Singh 2017-10-30 3182 47dde7dbc279f3 Mike Rapoport 2020-05-16 3183 printf("p4dp @ 0x%px = 0x%016lx\n", p4dp, p4d_val(*p4dp)); 47dde7dbc279f3 Mike Rapoport 2020-05-16 3184 47dde7dbc279f3 Mike Rapoport 2020-05-16 3185 pudp = pud_offset(p4dp, addr); 80eff6c4847997 Balbir Singh 2017-10-30 3186 80eff6c4847997 Balbir Singh 2017-10-30 3187 if (pud_none(*pudp)) { 80eff6c4847997 Balbir Singh 2017-10-30 3188 printf("No valid PUD\n"); 80eff6c4847997 Balbir Singh 2017-10-30 3189 return; 80eff6c4847997 Balbir Singh 2017-10-30 3190 } 80eff6c4847997 Balbir Singh 2017-10-30 3191 d6eacedd1f0ebf Aneesh Kumar K.V 2019-05-14 3192 if (pud_is_leaf(*pudp)) { 80eff6c4847997 Balbir Singh 2017-10-30 3193 format_pte(pudp, pud_val(*pudp)); 80eff6c4847997 Balbir Singh 2017-10-30 3194 return; 80eff6c4847997 Balbir Singh 2017-10-30 3195 } 80eff6c4847997 Balbir Singh 2017-10-30 3196 e70d8f55268ba9 Mathieu Malaterre 2018-03-25 3197 printf("pudp @ 0x%px = 0x%016lx\n", pudp, pud_val(*pudp)); 80eff6c4847997 Balbir Singh 2017-10-30 3198 80eff6c4847997 Balbir Singh 2017-10-30 3199 pmdp = pmd_offset(pudp, addr); 80eff6c4847997 Balbir Singh 2017-10-30 3200 80eff6c4847997 Balbir Singh 2017-10-30 3201 if (pmd_none(*pmdp)) { 80eff6c4847997 Balbir Singh 2017-10-30 3202 printf("No valid PMD\n"); 80eff6c4847997 Balbir Singh 2017-10-30 3203 return; 80eff6c4847997 Balbir Singh 2017-10-30 3204 } 80eff6c4847997 Balbir Singh 2017-10-30 3205 d6eacedd1f0ebf Aneesh Kumar K.V 2019-05-14 3206 if (pmd_is_leaf(*pmdp)) { 80eff6c4847997 Balbir Singh 2017-10-30 3207 format_pte(pmdp, pmd_val(*pmdp)); 80eff6c4847997 Balbir Singh 2017-10-30 3208 return; 80eff6c4847997 Balbir Singh 2017-10-30 3209 } e70d8f55268ba9 Mathieu Malaterre 2018-03-25 3210 printf("pmdp @ 0x%px = 0x%016lx\n", pmdp, pmd_val(*pmdp)); 80eff6c4847997 Balbir Singh 2017-10-30 3211 80eff6c4847997 Balbir Singh 2017-10-30 3212 ptep = pte_offset_map(pmdp, addr); 80eff6c4847997 Balbir Singh 2017-10-30 3213 if (pte_none(*ptep)) { 80eff6c4847997 Balbir Singh 2017-10-30 3214 printf("no valid PTE\n"); 80eff6c4847997 Balbir Singh 2017-10-30 3215 return; 80eff6c4847997 Balbir Singh 2017-10-30 3216 } 80eff6c4847997 Balbir Singh 2017-10-30 3217 80eff6c4847997 Balbir Singh 2017-10-30 3218 format_pte(ptep, pte_val(*ptep)); 80eff6c4847997 Balbir Singh 2017-10-30 3219 80eff6c4847997 Balbir Singh 2017-10-30 3220 sync(); 80eff6c4847997 Balbir Singh 2017-10-30 3221 __delay(200); 80eff6c4847997 Balbir Singh 2017-10-30 3222 catch_memory_errors = 0; 80eff6c4847997 Balbir Singh 2017-10-30 3223 } 80eff6c4847997 Balbir Singh 2017-10-30 3224 #else 80eff6c4847997 Balbir Singh 2017-10-30 3225 static void show_pte(unsigned long addr) 80eff6c4847997 Balbir Singh 2017-10-30 3226 { 80eff6c4847997 Balbir Singh 2017-10-30 3227 printf("show_pte not yet implemented\n"); 80eff6c4847997 Balbir Singh 2017-10-30 3228 } 80eff6c4847997 Balbir Singh 2017-10-30 3229 #endif /* CONFIG_PPC_BOOK3S_64 */ 80eff6c4847997 Balbir Singh 2017-10-30 3230 :::::: The code at line 3138 was first introduced by commit :::::: 80eff6c484799722736471d15ff9cc86b64cae7a powerpc/xmon: Support dumping software pagetables :::::: TO: Balbir Singh <bsingharora(a)gmail.com&gt; :::::: CC: Michael Ellerman <mpe(a)ellerman.id.au&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org