tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 712e14250dd2907346617eba275c46f53db8fae7 commit: 6e79b375adb38219099d7e3ccc973a7808108a3e proc: test /proc/${pid}/statm compiler: gcc-12 (Ubuntu 12.3.0-9ubuntu2) 12.3.0 If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <yujie.liu@xxxxxxxxx> | Closes: https://lore.kernel.org/r/202404010211.ygidvMwa-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): proc-empty-vm.c: In function 'test_proc_pid_statm': >> proc-empty-vm.c:342:17: warning: ignoring return value of 'write' declared with attribute 'warn_unused_result' [-Wunused-result] 342 | write(1, buf, rv); | ^~~~~~~~~~~~~~~~~ vim +342 tools/testing/selftests/proc/proc-empty-vm.c 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 320 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 321 /* 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 322 * There seems to be 2 types of valid output: 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 323 * "0 A A B 0 0 0\n" for dynamic exeuctables, 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 324 * "0 0 0 B 0 0 0\n" for static executables. 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 325 */ 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 326 static int test_proc_pid_statm(pid_t pid) 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 327 { 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 328 char buf[4096]; 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 329 snprintf(buf, sizeof(buf), "/proc/%u/statm", pid); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 330 int fd = open(buf, O_RDONLY); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 331 if (fd == -1) { 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 332 perror("open /proc/${pid}/statm"); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 333 return EXIT_FAILURE; 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 334 } 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 335 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 336 ssize_t rv = read(fd, buf, sizeof(buf)); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 337 close(fd); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 338 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 339 assert(rv >= 0); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 340 assert(rv <= sizeof(buf)); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 341 if (0) { 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 @342 write(1, buf, rv); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 343 } 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 344 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 345 const char *p = buf; 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 346 const char *const end = p + rv; 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 347 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 348 /* size */ 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 349 assert(p != end && *p++ == '0'); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 350 assert(p != end && *p++ == ' '); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 351 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 352 uint64_t resident; 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 353 p = parse_u64(p, end, &resident); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 354 assert(p != end && *p++ == ' '); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 355 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 356 uint64_t shared; 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 357 p = parse_u64(p, end, &shared); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 358 assert(p != end && *p++ == ' '); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 359 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 360 uint64_t text; 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 361 p = parse_u64(p, end, &text); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 362 assert(p != end && *p++ == ' '); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 363 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 364 assert(p != end && *p++ == '0'); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 365 assert(p != end && *p++ == ' '); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 366 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 367 /* data */ 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 368 assert(p != end && *p++ == '0'); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 369 assert(p != end && *p++ == ' '); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 370 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 371 assert(p != end && *p++ == '0'); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 372 assert(p != end && *p++ == '\n'); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 373 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 374 assert(p == end); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 375 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 376 /* 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 377 * "text" is "mm->end_code - mm->start_code" at execve(2) time. 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 378 * munmap() doesn't change it. It can be anything (just link 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 379 * statically). It can't be 0 because executing to this point 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 380 * implies at least 1 page of code. 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 381 */ 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 382 assert(text > 0); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 383 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 384 /* 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 385 * These two are always equal. Always 0 for statically linked 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 386 * executables and sometimes 0 for dynamically linked executables. 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 387 * There is no way to tell one from another without parsing ELF 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 388 * which is too much for this test. 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 389 */ 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 390 assert(resident == shared); 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 391 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 392 return EXIT_SUCCESS; 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 393 } 6e79b375adb382 Swarup Laxman Kotiaklapudi 2023-10-09 394 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
