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Message-ID: <202512111251.xMUT4l7V-lkp@intel.com>
Date: Thu, 11 Dec 2025 12:57:24 +0800
From: kernel test robot <lkp@...el.com>
To: Nam Cao <namcao@...utronix.de>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
Ingo Molnar <mingo@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: kernel/time/sched_clock.c:219:13: sparse: sparse: dereference of
noderef expression
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: d358e5254674b70f34c847715ca509e46eb81e6f
commit: 04257da0c99c9d4ff7c5bb93046482e1f7d34938 hrtimers: Make callback function pointer private
date: 8 months ago
config: arc-randconfig-r122-20251211 (https://download.01.org/0day-ci/archive/20251211/202512111251.xMUT4l7V-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251211/202512111251.xMUT4l7V-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512111251.xMUT4l7V-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
>> kernel/time/sched_clock.c:219:13: sparse: sparse: dereference of noderef expression
vim +219 kernel/time/sched_clock.c
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 176
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 177 void __init
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 178 sched_clock_register(u64 (*read)(void), int bits, unsigned long rate)
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 179 {
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 180 u64 res, wrap, new_mask, new_epoch, cyc, ns;
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 181 u32 new_mult, new_shift;
2707745533d6d38 kernel/time/sched_clock.c Paul Cercueil 2020-01-07 182 unsigned long r, flags;
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 183 char r_unit;
1809bfa44e1019e kernel/time/sched_clock.c Daniel Thompson 2015-03-26 184 struct clock_read_data rd;
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 185
c115739da801ea1 arch/arm/kernel/sched_clock.c Rob Herring 2013-02-08 186 if (cd.rate > rate)
c115739da801ea1 arch/arm/kernel/sched_clock.c Rob Herring 2013-02-08 187 return;
c115739da801ea1 arch/arm/kernel/sched_clock.c Rob Herring 2013-02-08 188
2707745533d6d38 kernel/time/sched_clock.c Paul Cercueil 2020-01-07 189 /* Cannot register a sched_clock with interrupts on */
2707745533d6d38 kernel/time/sched_clock.c Paul Cercueil 2020-01-07 190 local_irq_save(flags);
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 191
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 192 /* Calculate the mult/shift to convert counter ticks to ns. */
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 193 clocks_calc_mult_shift(&new_mult, &new_shift, rate, NSEC_PER_SEC, 3600);
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 194
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 195 new_mask = CLOCKSOURCE_MASK(bits);
8710e914027e4f6 kernel/time/sched_clock.c Daniel Thompson 2015-03-26 196 cd.rate = rate;
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 197
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 198 /* Calculate how many nanosecs until we risk wrapping */
fb82fe2fe858874 kernel/time/sched_clock.c John Stultz 2015-03-11 199 wrap = clocks_calc_max_nsecs(new_mult, new_shift, 0, new_mask, NULL);
8710e914027e4f6 kernel/time/sched_clock.c Daniel Thompson 2015-03-26 200 cd.wrap_kt = ns_to_ktime(wrap);
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 201
1809bfa44e1019e kernel/time/sched_clock.c Daniel Thompson 2015-03-26 202 rd = cd.read_data[0];
1809bfa44e1019e kernel/time/sched_clock.c Daniel Thompson 2015-03-26 203
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 204 /* Update epoch for new counter and update 'epoch_ns' from old counter*/
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 205 new_epoch = read();
13dbeb384d2d3aa kernel/time/sched_clock.c Daniel Thompson 2015-03-26 206 cyc = cd.actual_read_sched_clock();
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 207 ns = rd.epoch_ns + cyc_to_ns((cyc - rd.epoch_cyc) & rd.sched_clock_mask, rd.mult, rd.shift);
13dbeb384d2d3aa kernel/time/sched_clock.c Daniel Thompson 2015-03-26 208 cd.actual_read_sched_clock = read;
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 209
1809bfa44e1019e kernel/time/sched_clock.c Daniel Thompson 2015-03-26 210 rd.read_sched_clock = read;
1809bfa44e1019e kernel/time/sched_clock.c Daniel Thompson 2015-03-26 211 rd.sched_clock_mask = new_mask;
1809bfa44e1019e kernel/time/sched_clock.c Daniel Thompson 2015-03-26 212 rd.mult = new_mult;
1809bfa44e1019e kernel/time/sched_clock.c Daniel Thompson 2015-03-26 213 rd.shift = new_shift;
1809bfa44e1019e kernel/time/sched_clock.c Daniel Thompson 2015-03-26 214 rd.epoch_cyc = new_epoch;
1809bfa44e1019e kernel/time/sched_clock.c Daniel Thompson 2015-03-26 215 rd.epoch_ns = ns;
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 216
1809bfa44e1019e kernel/time/sched_clock.c Daniel Thompson 2015-03-26 217 update_clock_read_data(&rd);
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 218
1b8955bc5ac5750 kernel/time/sched_clock.c David Engraf 2017-02-17 @219 if (sched_clock_timer.function != NULL) {
1b8955bc5ac5750 kernel/time/sched_clock.c David Engraf 2017-02-17 220 /* update timeout for clock wrap */
2c8bd58812ee3db kernel/time/sched_clock.c Ahmed S. Darwish 2020-03-09 221 hrtimer_start(&sched_clock_timer, cd.wrap_kt,
2c8bd58812ee3db kernel/time/sched_clock.c Ahmed S. Darwish 2020-03-09 222 HRTIMER_MODE_REL_HARD);
1b8955bc5ac5750 kernel/time/sched_clock.c David Engraf 2017-02-17 223 }
1b8955bc5ac5750 kernel/time/sched_clock.c David Engraf 2017-02-17 224
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 225 r = rate;
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 226 if (r >= 4000000) {
92067440f1311df kernel/time/sched_clock.c Maciej W. Rozycki 2022-04-24 227 r = DIV_ROUND_CLOSEST(r, 1000000);
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 228 r_unit = 'M';
f4b62e1e1137507 kernel/time/sched_clock.c Maciej W. Rozycki 2022-04-24 229 } else if (r >= 4000) {
92067440f1311df kernel/time/sched_clock.c Maciej W. Rozycki 2022-04-24 230 r = DIV_ROUND_CLOSEST(r, 1000);
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 231 r_unit = 'k';
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 232 } else {
2f0778afac79bd8 arch/arm/kernel/sched_clock.c Marc Zyngier 2011-12-15 233 r_unit = ' ';
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 234 }
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 235
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 236 /* Calculate the ns resolution of this counter */
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 237 res = cyc_to_ns(1ULL, new_mult, new_shift);
5ae8aabeaec3fe6 kernel/time/sched_clock.c Stephen Boyd 2014-02-17 238
a08ca5d1089da03 kernel/time/sched_clock.c Stephen Boyd 2013-07-18 239 pr_info("sched_clock: %u bits at %lu%cHz, resolution %lluns, wraps every %lluns\n",
a08ca5d1089da03 kernel/time/sched_clock.c Stephen Boyd 2013-07-18 240 bits, r, r_unit, res, wrap);
112f38a4a31668e arch/arm/kernel/sched_clock.c Russell King 2010-12-15 241
32fea568aec5b73 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 242 /* Enable IRQ time accounting if we have a fast enough sched_clock() */
a42c362980430be arch/arm/kernel/sched_clock.c Russell King 2012-09-09 243 if (irqtime > 0 || (irqtime == -1 && rate >= 1000000))
a42c362980430be arch/arm/kernel/sched_clock.c Russell King 2012-09-09 244 enable_sched_clock_irqtime();
a42c362980430be arch/arm/kernel/sched_clock.c Russell King 2012-09-09 245
2707745533d6d38 kernel/time/sched_clock.c Paul Cercueil 2020-01-07 246 local_irq_restore(flags);
2707745533d6d38 kernel/time/sched_clock.c Paul Cercueil 2020-01-07 247
d75f773c86a2b8b kernel/time/sched_clock.c Sakari Ailus 2019-03-25 248 pr_debug("Registered %pS as sched_clock source\n", read);
2f0778afac79bd8 arch/arm/kernel/sched_clock.c Marc Zyngier 2011-12-15 249 }
2f0778afac79bd8 arch/arm/kernel/sched_clock.c Marc Zyngier 2011-12-15 250
:::::: The code at line 219 was first introduced by commit
:::::: 1b8955bc5ac575009835e371ae55e7f3af2197a9 timers, sched_clock: Update timeout for clock wrap
:::::: TO: David Engraf <david.engraf@...go.com>
:::::: CC: John Stultz <john.stultz@...aro.org>
--
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https://github.com/intel/lkp-tests/wiki
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