tree: https://github.com/jimc/linux.git dd-diet-6 head: 02405228312e180cda1d5c7a5c784bef1540197e commit: 272e0af356f3c076132cffeb729b5435387d82bd [36/37] dyndbg: try to release unneeded memory (panics) config: powerpc-randconfig-r026-20210613 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d2012d965d60c3258b3a69d024491698f8aec386) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://github.com/jimc/linux/commit/272e0af356f3c076132cffeb729b5435387d... git remote add jimc https://github.com/jimc/linux.git git fetch --no-tags jimc dd-diet-6 git checkout 272e0af356f3c076132cffeb729b5435387d82bd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 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/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:45:1: note: expanded from here __do_insb ^ arch/powerpc/include/asm/io.h:556:56: note: expanded from macro '__do_insb' #define __do_insb(p, b, n) readsb((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from lib/dynamic_debug.c:35: 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:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-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>:47:1: 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 lib/dynamic_debug.c:35: 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: 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:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:49:1: 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 lib/dynamic_debug.c:35: 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: 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:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:51:1: 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 lib/dynamic_debug.c:35: 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: 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:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:53:1: 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 lib/dynamic_debug.c:35: 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: 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:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:55:1: 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)) ~~~~~~~~~~~~~~~~~~~~~^ static int __init __attribute__((optimize(0))) ^~~~~~~~~~~ lib/dynamic_debug.c:1332:21: warning: unused variable 'addr' [-Wunused-variable] unsigned long pfn, addr; ^ 9 warnings generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for HOTPLUG_CPU Depends on SMP && (PPC_PSERIES || PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE Selected by - PM_SLEEP_SMP && SMP && (ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE && PM_SLEEP vim +/optimize +1319 lib/dynamic_debug.c 1318 1320 dynamic_debug_init(void) 1321 { 1322 struct _ddebug *iter, *iter_mod_start; 1323 struct _ddebug_site *site, *site_mod_start; 1324 1325 const char *modname = NULL; 1326 char *cmdline; 1327 int ret = 0; 1328 int i, site_ct = 0, modct = 0, mod_index = 0; 1329 unsigned int site_base; 1330 // volatile 1331 struct page *pg; 1332 unsigned long pfn, addr; 1333 1334 if (&__start___dyndbg == &__stop___dyndbg) { 1335 if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) { 1336 pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n"); 1337 return 1; 1338 } 1339 pr_info("Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build\n"); 1340 ddebug_init_success = 1; 1341 return 0; 1342 } 1343 1344 iter = iter_mod_start = __start___dyndbg; 1345 site = site_mod_start = __start___dyndbg_sites; 1346 modname = site->modname; 1347 1348 for (site_base = i = 0; iter < __stop___dyndbg; iter++, site++, i++) { 1349 1350 SITE_CHK_(BUG_ON(site != iter->site)); 1351 1352 if (strcmp(modname, site->modname)) { 1353 modct++; 1354 1355 ret = __ddebug_add_module(iter_mod_start, site_mod_start, 1356 site_ct, mod_index, modname, 1357 __start___dyndbg_sites, &site_base); 1358 if (ret) 1359 goto out_err; 1360 1361 modname = site->modname; 1362 iter_mod_start = iter; 1363 site_mod_start = site; 1364 mod_index += site_ct; 1365 site_ct = 0; 1366 } 1367 site_ct++; 1368 } 1369 ret = __ddebug_add_module(iter_mod_start, site_mod_start, 1370 site_ct, mod_index, modname, 1371 __start___dyndbg_sites, &site_base); 1372 if (ret) 1373 goto out_err; 1374 1375 vpr_info("page: %px %px, %px %px, %px %px %d/%d\n", 1376 virt_to_page(__start___dyndbg_sites), __start___dyndbg_sites, 1377 virt_to_page(site), site, 1378 virt_to_page(__stop___dyndbg_sites), __stop___dyndbg_sites, 1379 site_base, i); 1380 1381 pg = virt_to_page(__start___dyndbg_sites); 1382 vpr_info("page: %px\n", pg); 1383 1384 pg = virt_to_page(site); 1385 vpr_info("page: %px\n", pg); 1386 1387 pg = virt_to_page(__stop___dyndbg_sites); 1388 vpr_info("page: %px\n", pg); 1389 1390 pg = virt_to_page(__stop___dyndbg_sites - PAGE_SIZE); 1391 vpr_info("page: %px\n", pg); 1392 /* 1393 for (addr = site; addr < __stop___dyndbg_sites; addr += PAGE_SIZE) { 1394 pg = pfn_to_page(addr >> PAGE_SHIFT); 1395 vpr_info("freeing page: %px\n", pg); 1396 free_reserved_page(pg); 1397 } 1398 */ 1399 for (pfn = PFN_UP((long)site); 1400 pfn < PFN_DOWN((long)__stop___dyndbg_sites); pfn++) { 1401 struct page *page = pfn_to_page(pfn); 1402 vpr_info("freeing page: %px %ld\n", page, pfn); 1403 free_reserved_page(page); 1404 } 1405 /* 1406 for (pg = virt_to_page(__stop___dyndbg_sites - PAGE_SIZE); 1407 pg > virt_to_page(site); 1408 pg = virt_to_page(site - PAGE_SIZE)) { 1409 vpr_info("freeing page: %px\n", pg); 1410 free_reserved_page(pg); 1411 } 1412 */ 1413 ddebug_init_success = 1; 1414 vpr_info("%d prdebugs in %d modules, %d KiB in ddebug tables, %d KiB in __dyndbg section, %d KiB in __dyndbg_sites section\n", 1415 i, modct, (int)((modct * sizeof(struct ddebug_table)) >> 10), 1416 (int)((i * sizeof(struct _ddebug)) >> 10), 1417 (int)((i * sizeof(struct _ddebug_site)) >> 10)); 1418 1419 /* apply ddebug_query boot param, dont unload tables on err */ 1420 if (ddebug_setup_string[0] != '\0') { 1421 pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n"); 1422 ret = ddebug_exec_queries(ddebug_setup_string, NULL); 1423 if (ret < 0) 1424 pr_warn("Invalid ddebug boot param %s\n", 1425 ddebug_setup_string); 1426 else 1427 pr_info("%d changes by ddebug_query\n", ret); 1428 } 1429 /* now that ddebug tables are loaded, process all boot args 1430 * again to find and activate queries given in dyndbg params. 1431 * While this has already been done for known boot params, it 1432 * ignored the unknown ones (dyndbg in particular). Reusing 1433 * parse_args avoids ad-hoc parsing. This will also attempt 1434 * to activate queries for not-yet-loaded modules, which is 1435 * slightly noisy if verbose, but harmless. 1436 */ 1437 cmdline = kstrdup(saved_command_line, GFP_KERNEL); 1438 parse_args("dyndbg params", cmdline, NULL, 1439 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb); 1440 kfree(cmdline); 1441 return 0; 1442 1443 out_err: 1444 ddebug_remove_all_tables(); 1445 return 0; 1446 } 1447 /* Allow early initialization for boot messages via boot param */ 1448 early_initcall(dynamic_debug_init); 1449 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org