* [thomas-weissschuh:b4/auxclock-nanosleep 21/60] kernel/time/hrtimer.c:2092:55: warning: variable 'timer' is uninitialized when used here
@ 2026-07-01 22:19 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-07-01 22:19 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: 80d7be4639ebb1f847fd06f3b8ad6b60389a6399
commit: ab89377d780b43204be2991594e25d64d4de0c88 [21/60] validation
config: hexagon-allnoconfig (https://download.01.org/0day-ci/archive/20260702/202607020630.c13YhNOy-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 6cc609bb250b21b47fc7d394b4019101e9983597)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260702/202607020630.c13YhNOy-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/202607020630.c13YhNOy-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/time/hrtimer.c:2092:55: warning: variable 'timer' is uninitialized when used here [-Wuninitialized]
2092 | if (trace_hrtimer_run_queues_deviation_enabled() && timer) {
| ^~~~~
kernel/time/hrtimer.c:2090:24: note: initialize the variable 'timer' to silence this warning
2090 | struct hrtimer *timer;
| ^
| = NULL
1 warning generated.
vim +/timer +2092 kernel/time/hrtimer.c
2081
2082 static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now,
2083 unsigned long flags, unsigned int active_mask)
2084 {
2085 unsigned int active = cpu_base->active_bases & active_mask;
2086 struct hrtimer_clock_base *base;
2087
2088 for_each_active_base(base, cpu_base, active) {
2089 ktime_t basenow = ktime_add(now, base->offset);
2090 struct hrtimer *timer;
2091
> 2092 if (trace_hrtimer_run_queues_deviation_enabled() && timer) {
2093 timer = clock_base_next_timer(base);
2094
2095 if (timer) {
2096 ktime_t real_basenow = hrtimer_cb_get_time(timer);
2097
2098 /* Should never be negative */
2099 trace_hrtimer_run_queues_deviation(cpu_base, base->clockid,
2100 ktime_sub(real_basenow, basenow));
2101 }
2102 }
2103
2104 while ((timer = clock_base_next_timer(base))) {
2105 /*
2106 * The immediate goal for using the softexpires is
2107 * minimizing wakeups, not running timers at the
2108 * earliest interrupt after their soft expiration.
2109 * This allows us to avoid using a Priority Search
2110 * Tree, which can answer a stabbing query for
2111 * overlapping intervals and instead use the simple
2112 * BST we already have.
2113 * We don't add extra wakeups by delaying timers that
2114 * are right-of a not yet expired timer, because that
2115 * timer will have to trigger a wakeup anyway.
2116 */
2117 if (basenow < hrtimer_get_softexpires(timer))
2118 break;
2119
2120 __run_hrtimer(cpu_base, base, timer, basenow, flags);
2121 if (active_mask == HRTIMER_ACTIVE_SOFT)
2122 hrtimer_sync_wait_running(cpu_base, flags);
2123 }
2124 }
2125 }
2126
--
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 21/60] kernel/time/hrtimer.c:2092:55: warning: variable 'timer' is uninitialized when used here
@ 2026-07-01 17:51 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-07-01 17:51 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: 80d7be4639ebb1f847fd06f3b8ad6b60389a6399
commit: ab89377d780b43204be2991594e25d64d4de0c88 [21/60] validation
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260701/202607011937.nn21lRKI-lkp@intel.com/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260701/202607011937.nn21lRKI-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/202607011937.nn21lRKI-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/time/hrtimer.c:2092:55: warning: variable 'timer' is uninitialized when used here [-Wuninitialized]
2092 | if (trace_hrtimer_run_queues_deviation_enabled() && timer) {
| ^~~~~
kernel/time/hrtimer.c:2090:24: note: initialize the variable 'timer' to silence this warning
2090 | struct hrtimer *timer;
| ^
| = NULL
1 warning generated.
vim +/timer +2092 kernel/time/hrtimer.c
2081
2082 static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now,
2083 unsigned long flags, unsigned int active_mask)
2084 {
2085 unsigned int active = cpu_base->active_bases & active_mask;
2086 struct hrtimer_clock_base *base;
2087
2088 for_each_active_base(base, cpu_base, active) {
2089 ktime_t basenow = ktime_add(now, base->offset);
2090 struct hrtimer *timer;
2091
> 2092 if (trace_hrtimer_run_queues_deviation_enabled() && timer) {
2093 timer = clock_base_next_timer(base);
2094
2095 if (timer) {
2096 ktime_t real_basenow = hrtimer_cb_get_time(timer);
2097
2098 /* Should never be negative */
2099 trace_hrtimer_run_queues_deviation(cpu_base, base->clockid,
2100 ktime_sub(real_basenow, basenow));
2101 }
2102 }
2103
2104 while ((timer = clock_base_next_timer(base))) {
2105 /*
2106 * The immediate goal for using the softexpires is
2107 * minimizing wakeups, not running timers at the
2108 * earliest interrupt after their soft expiration.
2109 * This allows us to avoid using a Priority Search
2110 * Tree, which can answer a stabbing query for
2111 * overlapping intervals and instead use the simple
2112 * BST we already have.
2113 * We don't add extra wakeups by delaying timers that
2114 * are right-of a not yet expired timer, because that
2115 * timer will have to trigger a wakeup anyway.
2116 */
2117 if (basenow < hrtimer_get_softexpires(timer))
2118 break;
2119
2120 __run_hrtimer(cpu_base, base, timer, basenow, flags);
2121 if (active_mask == HRTIMER_ACTIVE_SOFT)
2122 hrtimer_sync_wait_running(cpu_base, flags);
2123 }
2124 }
2125 }
2126
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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