tree: https://github.com/agraf/linux-2.6.git kvm-kho-gmem-test head: 9a58862a298a63bad21d05191e28b857063bb9dc commit: 85a88d907dbaefe323ceb6c077042b1149a93de9 [25/27] XXX Make ARM clock contiguous across kexec config: parisc-allnoconfig (https://download.01.org/0day-ci/archive/20240505/202405050234.5uAIYHNR-lkp@xxxxxxxxx/config) compiler: hppa-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240505/202405050234.5uAIYHNR-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202405050234.5uAIYHNR-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): kernel/time/sched_clock.c: In function 'sched_clock_register': >> kernel/time/sched_clock.c:166:50: warning: variable 'ns' set but not used [-Wunused-but-set-variable] 166 | u64 res, wrap, new_mask, new_epoch, cyc, ns; | ^~ >> kernel/time/sched_clock.c:166:34: warning: variable 'new_epoch' set but not used [-Wunused-but-set-variable] 166 | u64 res, wrap, new_mask, new_epoch, cyc, ns; | ^~~~~~~~~ vim +/ns +166 kernel/time/sched_clock.c 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 162 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 163 void __init 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 164 sched_clock_register(u64 (*read)(void), int bits, unsigned long rate) 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 165 { 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 @166 u64 res, wrap, new_mask, new_epoch, cyc, ns; 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 167 u32 new_mult, new_shift; 2707745533d6d3 kernel/time/sched_clock.c Paul Cercueil 2020-01-07 168 unsigned long r, flags; 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 169 char r_unit; 1809bfa44e1019 kernel/time/sched_clock.c Daniel Thompson 2015-03-26 170 struct clock_read_data rd; 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 171 c115739da801ea arch/arm/kernel/sched_clock.c Rob Herring 2013-02-08 172 if (cd.rate > rate) c115739da801ea arch/arm/kernel/sched_clock.c Rob Herring 2013-02-08 173 return; c115739da801ea arch/arm/kernel/sched_clock.c Rob Herring 2013-02-08 174 2707745533d6d3 kernel/time/sched_clock.c Paul Cercueil 2020-01-07 175 /* Cannot register a sched_clock with interrupts on */ 2707745533d6d3 kernel/time/sched_clock.c Paul Cercueil 2020-01-07 176 local_irq_save(flags); 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 177 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 178 /* Calculate the mult/shift to convert counter ticks to ns. */ 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 179 clocks_calc_mult_shift(&new_mult, &new_shift, rate, NSEC_PER_SEC, 3600); 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 180 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 181 new_mask = CLOCKSOURCE_MASK(bits); 8710e914027e4f kernel/time/sched_clock.c Daniel Thompson 2015-03-26 182 cd.rate = rate; 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 183 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 184 /* Calculate how many nanosecs until we risk wrapping */ fb82fe2fe85887 kernel/time/sched_clock.c John Stultz 2015-03-11 185 wrap = clocks_calc_max_nsecs(new_mult, new_shift, 0, new_mask, NULL); 8710e914027e4f kernel/time/sched_clock.c Daniel Thompson 2015-03-26 186 cd.wrap_kt = ns_to_ktime(wrap); 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 187 1809bfa44e1019 kernel/time/sched_clock.c Daniel Thompson 2015-03-26 188 rd = cd.read_data[0]; 1809bfa44e1019 kernel/time/sched_clock.c Daniel Thompson 2015-03-26 189 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 190 /* Update epoch for new counter and update 'epoch_ns' from old counter*/ 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 191 new_epoch = read(); 13dbeb384d2d3a kernel/time/sched_clock.c Daniel Thompson 2015-03-26 192 cyc = cd.actual_read_sched_clock(); 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 193 ns = rd.epoch_ns + cyc_to_ns((cyc - rd.epoch_cyc) & rd.sched_clock_mask, rd.mult, rd.shift); 13dbeb384d2d3a kernel/time/sched_clock.c Daniel Thompson 2015-03-26 194 cd.actual_read_sched_clock = read; 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 195 1809bfa44e1019 kernel/time/sched_clock.c Daniel Thompson 2015-03-26 196 rd.read_sched_clock = read; 1809bfa44e1019 kernel/time/sched_clock.c Daniel Thompson 2015-03-26 197 rd.sched_clock_mask = new_mask; 1809bfa44e1019 kernel/time/sched_clock.c Daniel Thompson 2015-03-26 198 rd.mult = new_mult; 1809bfa44e1019 kernel/time/sched_clock.c Daniel Thompson 2015-03-26 199 rd.shift = new_shift; 85a88d907dbaef kernel/time/sched_clock.c Alexander Graf 2024-04-30 200 rd.epoch_cyc = 0; //new_epoch; 85a88d907dbaef kernel/time/sched_clock.c Alexander Graf 2024-04-30 201 rd.epoch_ns = 0; //ns; 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 202 1809bfa44e1019 kernel/time/sched_clock.c Daniel Thompson 2015-03-26 203 update_clock_read_data(&rd); 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 204 1b8955bc5ac575 kernel/time/sched_clock.c David Engraf 2017-02-17 205 if (sched_clock_timer.function != NULL) { 1b8955bc5ac575 kernel/time/sched_clock.c David Engraf 2017-02-17 206 /* update timeout for clock wrap */ 2c8bd58812ee3d kernel/time/sched_clock.c Ahmed S. Darwish 2020-03-09 207 hrtimer_start(&sched_clock_timer, cd.wrap_kt, 2c8bd58812ee3d kernel/time/sched_clock.c Ahmed S. Darwish 2020-03-09 208 HRTIMER_MODE_REL_HARD); 1b8955bc5ac575 kernel/time/sched_clock.c David Engraf 2017-02-17 209 } 1b8955bc5ac575 kernel/time/sched_clock.c David Engraf 2017-02-17 210 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 211 r = rate; 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 212 if (r >= 4000000) { 92067440f1311d kernel/time/sched_clock.c Maciej W. Rozycki 2022-04-24 213 r = DIV_ROUND_CLOSEST(r, 1000000); 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 214 r_unit = 'M'; f4b62e1e113750 kernel/time/sched_clock.c Maciej W. Rozycki 2022-04-24 215 } else if (r >= 4000) { 92067440f1311d kernel/time/sched_clock.c Maciej W. Rozycki 2022-04-24 216 r = DIV_ROUND_CLOSEST(r, 1000); 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 217 r_unit = 'k'; 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 218 } else { 2f0778afac79bd arch/arm/kernel/sched_clock.c Marc Zyngier 2011-12-15 219 r_unit = ' '; 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 220 } 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 221 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 222 /* Calculate the ns resolution of this counter */ 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 223 res = cyc_to_ns(1ULL, new_mult, new_shift); 5ae8aabeaec3fe kernel/time/sched_clock.c Stephen Boyd 2014-02-17 224 a08ca5d1089da0 kernel/time/sched_clock.c Stephen Boyd 2013-07-18 225 pr_info("sched_clock: %u bits at %lu%cHz, resolution %lluns, wraps every %lluns\n", a08ca5d1089da0 kernel/time/sched_clock.c Stephen Boyd 2013-07-18 226 bits, r, r_unit, res, wrap); 112f38a4a31668 arch/arm/kernel/sched_clock.c Russell King 2010-12-15 227 32fea568aec5b7 kernel/time/sched_clock.c Ingo Molnar 2015-03-27 228 /* Enable IRQ time accounting if we have a fast enough sched_clock() */ a42c362980430b arch/arm/kernel/sched_clock.c Russell King 2012-09-09 229 if (irqtime > 0 || (irqtime == -1 && rate >= 1000000)) a42c362980430b arch/arm/kernel/sched_clock.c Russell King 2012-09-09 230 enable_sched_clock_irqtime(); a42c362980430b arch/arm/kernel/sched_clock.c Russell King 2012-09-09 231 2707745533d6d3 kernel/time/sched_clock.c Paul Cercueil 2020-01-07 232 local_irq_restore(flags); 2707745533d6d3 kernel/time/sched_clock.c Paul Cercueil 2020-01-07 233 d75f773c86a2b8 kernel/time/sched_clock.c Sakari Ailus 2019-03-25 234 pr_debug("Registered %pS as sched_clock source\n", read); 2f0778afac79bd arch/arm/kernel/sched_clock.c Marc Zyngier 2011-12-15 235 } 2f0778afac79bd arch/arm/kernel/sched_clock.c Marc Zyngier 2011-12-15 236 :::::: The code at line 166 was first introduced by commit :::::: 5ae8aabeaec3fe69c4fb21cbe5b17b72b35b5892 sched_clock: Prevent callers from seeing half-updated data :::::: TO: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> :::::: CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
