nolibc-test.c:930:24: warning: self-comparison always evaluates to false

[kernel test robot <lkp@intel.com>]

:::::: 
:::::: Manual check reason: "low confidence bisect report"
:::::: Manual check reason: "only suspicious fbc files changed"
:::::: 

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: "Thomas Weißschuh" <linux@weissschuh.net>

Hi Thomas,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   abdf623ddb75b24659018d3952d8f61937306ae5
commit: 6fe8360b16acbfb50c703f52568cad46759be2ed selftests/nolibc: also test libc-test through regular selftest framework
date:   8 months ago
:::::: branch date: 3 hours ago
:::::: commit date: 8 months ago
config: arm64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260901/202609010202.aqdwqM4q-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 06bfa42c66dea409a9737f9679260ff51425d5b3)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260901/202609010202.aqdwqM4q-lkp@intel.com/reproduce)

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
| Fixes: 6fe8360b16ac ("selftests/nolibc: also test libc-test through regular selftest framework")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/r/202609010202.aqdwqM4q-lkp@intel.com/

All warnings (new ones prefixed by >>):

   nolibc-test.c:784:9: warning: 'readdir_r' is deprecated [-Wdeprecated-declarations]
     784 |                 ret = readdir_r(dir, &dirent, &result);
         |                       ^
   /usr/lib/gcc/aarch64-linux-gnu/14/../../../../aarch64-linux-gnu/include/dirent.h:188:28: note: 'readdir_r' has been explicitly marked deprecated here
     188 |      __nonnull ((1, 2, 3)) __attribute_deprecated__;
         |                            ^
   /usr/lib/gcc/aarch64-linux-gnu/14/../../../../aarch64-linux-gnu/include/sys/cdefs.h:510:51: note: expanded from macro '__attribute_deprecated__'
     510 | # define __attribute_deprecated__ __attribute__ ((__deprecated__))
         |                                                   ^
>> nolibc-test.c:930:24: warning: self-comparison always evaluates to false [-Wtautological-compare]
     930 |         if (st.st_atim.tv_sec != st.st_atime || st.st_atim.tv_nsec > 1000000000)
         |                               ^
   nolibc-test.c:933:24: warning: self-comparison always evaluates to false [-Wtautological-compare]
     933 |         if (st.st_mtim.tv_sec != st.st_mtime || st.st_mtim.tv_nsec > 1000000000)
         |                               ^
   nolibc-test.c:936:24: warning: self-comparison always evaluates to false [-Wtautological-compare]
     936 |         if (st.st_ctim.tv_sec != st.st_ctime || st.st_ctim.tv_nsec > 1000000000)
         |                               ^
>> nolibc-test.c:1391:54: warning: null passed to a callee that requires a non-null argument [-Wnonnull]
    1391 |                 CASE_TEST(stat_fault);        EXPECT_SYSER(1, stat(NULL, &stat_buf), -1, EFAULT); break;
         |                                                                    ^~~~
   /opt/cross/clang-06bfa42c66/lib/clang/24/include/__stddef_null.h:26:14: note: expanded from macro 'NULL'
      26 | #define NULL ((void*)0)
         |              ^~~~~~~~~~
   nolibc-test.c:369:22: note: expanded from macro 'EXPECT_SYSER'
     369 |         EXPECT_SYSER2(cond, expr, expret, experr, 0)
         |                             ^~~~
   nolibc-test.c:366:70: note: expanded from macro 'EXPECT_SYSER2'
     366 |         do { if (!(cond)) result(llen, SKIPPED); else ret += expect_syserr2(expr, expret, experr1, experr2, llen); } while (0)
         |                                                                             ^~~~
   5 warnings generated.

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