* [thomas-weissschuh:b4/auxclock-nanosleep 17/44] kernel/time/benchmarks.c:65:8: warning: variable 'b' is used uninitialized whenever 'if' condition is true
@ 2026-04-29 21:23 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-04-29 21:23 UTC (permalink / raw)
To: Thomas Weißschuh (Schneider Electric); +Cc: llvm, oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/auxclock-nanosleep
head: 3e5442acb7e21f08c3eff2ecdace624b6647d5b1
commit: 2d4cde60596e5113f58afbb253423ffcabc891ac [17/44] benchmarks
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20260430/202604300558.Y15GkXgc-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260430/202604300558.Y15GkXgc-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/202604300558.Y15GkXgc-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/time/benchmarks.c:65:8: warning: variable 'b' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
65 | if (!ktime_get_aux(CLOCK_AUX, &a)) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/time/benchmarks.c:76:13: note: uninitialized use occurs here
76 | *sample = b - a;
| ^
kernel/time/benchmarks.c:65:4: note: remove the 'if' if its condition is always false
65 | if (!ktime_get_aux(CLOCK_AUX, &a)) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
66 | *sample = KTIME_MAX;
| ~~~~~~~~~~~~~~~~~~~~
67 | continue;
| ~~~~~~~~~
68 | }
| ~
kernel/time/benchmarks.c:62:15: note: initialize the variable 'b' to silence this warning
62 | ktime_t a, b;
| ^
| = 0
1 warning generated.
vim +65 kernel/time/benchmarks.c
57
58 static void benchmark_ktime_get_aux(struct benchmark_samples *samples)
59 {
60 for (size_t l = 0; l < ARRAY_SIZE(samples->d); l++) {
61 ktime_t *sample = &samples->d[l];
62 ktime_t a, b;
63
64 scoped_guard(preempt) {
> 65 if (!ktime_get_aux(CLOCK_AUX, &a)) {
66 *sample = KTIME_MAX;
67 continue;
68 }
69
70 if (!ktime_get_aux(CLOCK_AUX, &b)) {
71 *sample = KTIME_MAX;
72 continue;
73 }
74 }
75
76 *sample = b - a;
77 }
78 }
79
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* [thomas-weissschuh:b4/auxclock-nanosleep 17/44] kernel/time/benchmarks.c:65:8: warning: variable 'b' is used uninitialized whenever 'if' condition is true
@ 2026-04-30 1:19 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-04-30 1:19 UTC (permalink / raw)
To: Thomas Weißschuh (Schneider Electric); +Cc: llvm, oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/auxclock-nanosleep
head: 3e5442acb7e21f08c3eff2ecdace624b6647d5b1
commit: 2d4cde60596e5113f58afbb253423ffcabc891ac [17/44] benchmarks
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260430/202604300314.gaiQVLYr-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260430/202604300314.gaiQVLYr-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/202604300314.gaiQVLYr-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/time/benchmarks.c:65:8: warning: variable 'b' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
65 | if (!ktime_get_aux(CLOCK_AUX, &a)) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/time/benchmarks.c:76:13: note: uninitialized use occurs here
76 | *sample = b - a;
| ^
kernel/time/benchmarks.c:65:4: note: remove the 'if' if its condition is always false
65 | if (!ktime_get_aux(CLOCK_AUX, &a)) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
66 | *sample = KTIME_MAX;
| ~~~~~~~~~~~~~~~~~~~~
67 | continue;
| ~~~~~~~~~
68 | }
| ~
kernel/time/benchmarks.c:62:15: note: initialize the variable 'b' to silence this warning
62 | ktime_t a, b;
| ^
| = 0
1 warning generated.
vim +65 kernel/time/benchmarks.c
57
58 static void benchmark_ktime_get_aux(struct benchmark_samples *samples)
59 {
60 for (size_t l = 0; l < ARRAY_SIZE(samples->d); l++) {
61 ktime_t *sample = &samples->d[l];
62 ktime_t a, b;
63
64 scoped_guard(preempt) {
> 65 if (!ktime_get_aux(CLOCK_AUX, &a)) {
66 *sample = KTIME_MAX;
67 continue;
68 }
69
70 if (!ktime_get_aux(CLOCK_AUX, &b)) {
71 *sample = KTIME_MAX;
72 continue;
73 }
74 }
75
76 *sample = b - a;
77 }
78 }
79
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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