[thomas-weissschuh:b4/vdso-ptp 41/41] kernel/time/../../tools/testing/selftests/timers/auxclock.c:156:9: error: variable '_rval' is uninitialized when used here

[thomas-weissschuh:b4/vdso-ptp 41/41] kernel/time/../../tools/testing/selftests/timers/auxclock.c:156:9: error: variable '_rval' is uninitialized when used here

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/vdso-ptp
head:   2af36b301dbd31b23e13ee0d9d6cf65a475caba6
commit: 2af36b301dbd31b23e13ee0d9d6cf65a475caba6 [41/41] selftests/timers/auxclock: Test vDSO functionality
config: powerpc-allyesconfig (https://download.01.org/0day-ci/archive/20250618/202506180223.BOOk5jDK-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250618/202506180223.BOOk5jDK-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
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506180223.BOOk5jDK-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/time/test_auxclock.c:1:
>> kernel/time/../../tools/testing/selftests/timers/auxclock.c:156:9: error: variable '_rval' is uninitialized when used here [-Werror,-Wuninitialized]
     156 |                 ret = VDSO_CALL(self->vdso_clock_gettime, 2, clockid, &_ts);
         |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/time/../../tools/testing/selftests/timers/../vDSO/vdso_call.h:59:10: note: expanded from macro 'VDSO_CALL'
      59 |                 : "r" (_rval)                                           \
         |                        ^~~~~
   kernel/time/../../tools/testing/selftests/timers/auxclock.c:156:9: note: variable '_rval' is declared here
   kernel/time/../../tools/testing/selftests/timers/../vDSO/vdso_call.h:47:2: note: expanded from macro 'VDSO_CALL'
      47 |         register long _rval asm ("r3");                                 \
         |         ^
   In file included from kernel/time/test_auxclock.c:1:
   kernel/time/../../tools/testing/selftests/timers/auxclock.c:154:10: error: variable '_rval' is uninitialized when used here [-Werror,-Wuninitialized]
     154 |                 return VDSO_CALL(self->vdso_clock_gettime64, 2, clockid, ts);
         |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/time/../../tools/testing/selftests/timers/../vDSO/vdso_call.h:59:10: note: expanded from macro 'VDSO_CALL'
      59 |                 : "r" (_rval)                                           \
         |                        ^~~~~
   kernel/time/../../tools/testing/selftests/timers/auxclock.c:154:10: note: variable '_rval' is declared here
   kernel/time/../../tools/testing/selftests/timers/../vDSO/vdso_call.h:47:2: note: expanded from macro 'VDSO_CALL'
      47 |         register long _rval asm ("r3");                                 \
         |         ^
   In file included from kernel/time/test_auxclock.c:1:
   kernel/time/../../tools/testing/selftests/timers/auxclock.c:172:9: error: variable '_rval' is uninitialized when used here [-Werror,-Wuninitialized]
     172 |                 ret = VDSO_CALL(self->vdso_clock_getres, 2, clockid, &_ts);
         |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/time/../../tools/testing/selftests/timers/../vDSO/vdso_call.h:59:10: note: expanded from macro 'VDSO_CALL'
      59 |                 : "r" (_rval)                                           \
         |                        ^~~~~
   kernel/time/../../tools/testing/selftests/timers/auxclock.c:172:9: note: variable '_rval' is declared here
   kernel/time/../../tools/testing/selftests/timers/../vDSO/vdso_call.h:47:2: note: expanded from macro 'VDSO_CALL'
      47 |         register long _rval asm ("r3");                                 \
         |         ^
   3 errors generated.


vim +/_rval +156 kernel/time/../../tools/testing/selftests/timers/auxclock.c

   146	
   147	static int vdso_clock_gettime64(FIXTURE_DATA(auxclock) *self, __kernel_clockid_t clockid,
   148					struct __kernel_timespec *ts)
   149	{
   150		struct timespec _ts;
   151		int ret;
   152	
   153		if (self->vdso_clock_gettime64) {
   154			return VDSO_CALL(self->vdso_clock_gettime64, 2, clockid, ts);
   155		} else if (self->vdso_clock_gettime) {
 > 156			ret = VDSO_CALL(self->vdso_clock_gettime, 2, clockid, &_ts);
   157			if (!ret)
   158				timespec_to_kernel_timespec(&_ts, ts);
   159			return ret;
   160		} else {
   161			return -ENOSYS;
   162		}
   163	}
   164	

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