scripts/sorttable.h:380:6: warning: variable 'mcount_sort_thread' is used uninitialized whenever 'if' condition is true

From: kernel test robot
Date: Tue Jan 18 2022 - 06:15:30 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e3a8b6a1e70c37702054ae3c7c07ed828435d8ee
commit: 72b3942a173c387b27860ba1069636726e208777 scripts: ftrace - move the sort-processing in ftrace_init
date: 5 days ago
config: s390-randconfig-r044-20220116 (https://download.01.org/0day-ci/archive/20220118/202201181730.mj1jL8Vy-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c10cbb243cafc0cf42c3e922cb29183279444432)
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 s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=72b3942a173c387b27860ba1069636726e208777
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 72b3942a173c387b27860ba1069636726e208777
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 prepare

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

In file included from scripts/sorttable.c:195:
>> scripts/sorttable.h:380:6: warning: variable 'mcount_sort_thread' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
scripts/sorttable.h:479:6: note: uninitialized use occurs here
if (mcount_sort_thread) {
^~~~~~~~~~~~~~~~~~
scripts/sorttable.h:380:2: note: remove the 'if' if its condition is always false
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> scripts/sorttable.h:380:6: warning: variable 'mcount_sort_thread' is used uninitialized whenever '||' condition is true [-Wsometimes-uninitialized]
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
scripts/sorttable.h:479:6: note: uninitialized use occurs here
if (mcount_sort_thread) {
^~~~~~~~~~~~~~~~~~
scripts/sorttable.h:380:6: note: remove the '||' if its condition is always false
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> scripts/sorttable.h:380:6: warning: variable 'mcount_sort_thread' is used uninitialized whenever '||' condition is true [-Wsometimes-uninitialized]
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~
scripts/sorttable.h:479:6: note: uninitialized use occurs here
if (mcount_sort_thread) {
^~~~~~~~~~~~~~~~~~
scripts/sorttable.h:380:6: note: remove the '||' if its condition is always false
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~~~~
scripts/sorttable.h:288:30: note: initialize the variable 'mcount_sort_thread' to silence this warning
pthread_t mcount_sort_thread;
^
= 0
In file included from scripts/sorttable.c:197:
>> scripts/sorttable.h:380:6: warning: variable 'mcount_sort_thread' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
scripts/sorttable.h:479:6: note: uninitialized use occurs here
if (mcount_sort_thread) {
^~~~~~~~~~~~~~~~~~
scripts/sorttable.h:380:2: note: remove the 'if' if its condition is always false
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> scripts/sorttable.h:380:6: warning: variable 'mcount_sort_thread' is used uninitialized whenever '||' condition is true [-Wsometimes-uninitialized]
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
scripts/sorttable.h:479:6: note: uninitialized use occurs here
if (mcount_sort_thread) {
^~~~~~~~~~~~~~~~~~
scripts/sorttable.h:380:6: note: remove the '||' if its condition is always false
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> scripts/sorttable.h:380:6: warning: variable 'mcount_sort_thread' is used uninitialized whenever '||' condition is true [-Wsometimes-uninitialized]
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~
scripts/sorttable.h:479:6: note: uninitialized use occurs here
if (mcount_sort_thread) {
^~~~~~~~~~~~~~~~~~
scripts/sorttable.h:380:6: note: remove the '||' if its condition is always false
if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
^~~~~~~~~~~~~~~~~~~~~~~~~
scripts/sorttable.h:288:30: note: initialize the variable 'mcount_sort_thread' to silence this warning
pthread_t mcount_sort_thread;
^
= 0
6 warnings generated.
In file included from arch/s390/kernel/asm-offsets.c:11:
In file included from include/linux/kvm_host.h:35:
In file included from include/linux/kvm_para.h:5:
In file included from include/uapi/linux/kvm_para.h:37:
In file included from arch/s390/include/asm/kvm_para.h:25:
In file included from arch/s390/include/asm/diag.h:12:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from arch/s390/kernel/asm-offsets.c:11:
In file included from include/linux/kvm_host.h:35:
In file included from include/linux/kvm_para.h:5:
In file included from include/uapi/linux/kvm_para.h:37:
In file included from arch/s390/include/asm/kvm_para.h:25:
In file included from arch/s390/include/asm/diag.h:12:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from arch/s390/kernel/asm-offsets.c:11:
In file included from include/linux/kvm_host.h:35:
In file included from include/linux/kvm_para.h:5:
In file included from include/uapi/linux/kvm_para.h:37:
In file included from arch/s390/include/asm/kvm_para.h:25:
In file included from arch/s390/include/asm/diag.h:12:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
12 warnings generated.

vim +380 scripts/sorttable.h

378
379 #ifdef MCOUNT_SORT_ENABLED
> 380 if (!mstruct.init_data_sec || !_start_mcount_loc || !_stop_mcount_loc) {
381 fprintf(stderr,
382 "incomplete mcount's sort in file: %s\n",
383 fname);
384 goto out;
385 }
386
387 /* create thread to sort mcount_loc concurrently */
388 if (pthread_create(&mcount_sort_thread, NULL, &sort_mcount_loc, &mstruct)) {
389 fprintf(stderr,
390 "pthread_create mcount_sort_thread failed '%s': %s\n",
391 strerror(errno), fname);
392 goto out;
393 }
394 #endif
395 if (!extab_sec) {
396 fprintf(stderr, "no __ex_table in file: %s\n", fname);
397 goto out;
398 }
399
400 if (!symtab_sec) {
401 fprintf(stderr, "no .symtab in file: %s\n", fname);
402 goto out;
403 }
404
405 if (!strtab_sec) {
406 fprintf(stderr, "no .strtab in file: %s\n", fname);
407 goto out;
408 }
409
410 extab_image = (void *)ehdr + _r(&extab_sec->sh_offset);
411 strtab = (const char *)ehdr + _r(&strtab_sec->sh_offset);
412 symtab = (const Elf_Sym *)((const char *)ehdr +
413 _r(&symtab_sec->sh_offset));
414
415 if (custom_sort) {
416 custom_sort(extab_image, _r(&extab_sec->sh_size));
417 } else {
418 int num_entries = _r(&extab_sec->sh_size) / extable_ent_size;
419 qsort(extab_image, num_entries,
420 extable_ent_size, compare_extable);
421 }
422
423 /* If there were relocations, we no longer need them. */
424 if (relocs)
425 memset(relocs, 0, relocs_size);
426
427 /* find the flag main_extable_sort_needed */
428 for (sym = (void *)ehdr + _r(&symtab_sec->sh_offset);
429 sym < sym + _r(&symtab_sec->sh_size) / sizeof(Elf_Sym);
430 sym++) {
431 if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT)
432 continue;
433 if (!strcmp(strtab + r(&sym->st_name),
434 "main_extable_sort_needed")) {
435 sort_needed_sym = sym;
436 break;
437 }
438 }
439
440 if (!sort_needed_sym) {
441 fprintf(stderr,
442 "no main_extable_sort_needed symbol in file: %s\n",
443 fname);
444 goto out;
445 }
446
447 sort_needed_sec = &shdr[get_secindex(r2(&sym->st_shndx),
448 sort_needed_sym - symtab,
449 symtab_shndx)];
450 sort_needed_loc = (void *)ehdr +
451 _r(&sort_needed_sec->sh_offset) +
452 _r(&sort_needed_sym->st_value) -
453 _r(&sort_needed_sec->sh_addr);
454
455 /* extable has been sorted, clear the flag */
456 w(0, sort_needed_loc);
457 rc = 0;
458
459 out:
460 #if defined(SORTTABLE_64) && defined(UNWINDER_ORC_ENABLED)
461 if (orc_sort_thread) {
462 void *retval = NULL;
463 /* wait for ORC tables sort done */
464 rc = pthread_join(orc_sort_thread, &retval);
465 if (rc) {
466 fprintf(stderr,
467 "pthread_join failed '%s': %s\n",
468 strerror(errno), fname);
469 } else if (retval) {
470 rc = -1;
471 fprintf(stderr,
472 "failed to sort ORC tables '%s': %s\n",
473 (char *)retval, fname);
474 }
475 }
476 #endif
477

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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