tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/cache head: 2ba836dbe2467d31fffb439258c2f454c6f1a317 commit: 2ba836dbe2467d31fffb439258c2f454c6f1a317 [6/6] x86/resctrl: Fix incorrect local bandwidth when mba_sc is enabled config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=2b... git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git git fetch --no-tags tip x86/cache git checkout 2ba836dbe2467d31fffb439258c2f454c6f1a317 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): arch/x86/kernel/cpu/resctrl/monitor.c: In function '__mon_event_count': 291 | u64 chunks, tval; | ^~~~~~ vim +/chunks +291 arch/x86/kernel/cpu/resctrl/monitor.c ba0f26d8529c2d arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2018-04-20 287 d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 288 static int __mon_event_count(u32 rmid, struct rmid_read *rr) d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 289 { 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 290 struct mbm_state *m; ba0f26d8529c2d arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2018-04-20 @291 u64 chunks, tval; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 292 d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 293 tval = __rmid_read(rmid, rr->evtid); d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 294 if (tval & (RMID_VAL_ERROR | RMID_VAL_UNAVAIL)) { d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 295 rr->val = tval; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 296 return -EINVAL; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 297 } d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 298 switch (rr->evtid) { d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 299 case QOS_L3_OCCUP_EVENT_ID: d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 300 rr->val += tval; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 301 return 0; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 302 case QOS_L3_MBM_TOTAL_EVENT_ID: 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 303 m = &rr->d->mbm_total[rmid]; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 304 break; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 305 case QOS_L3_MBM_LOCAL_EVENT_ID: 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 306 m = &rr->d->mbm_local[rmid]; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 307 break; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 308 default: d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 309 /* d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 310 * Code would never reach here because d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 311 * an invalid event id would fail the __rmid_read. d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 312 */ d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 313 return -EINVAL; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 314 } a4de1dfdd72653 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 315 a4de1dfdd72653 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 316 if (rr->first) { ba0f26d8529c2d arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2018-04-20 317 memset(m, 0, sizeof(struct mbm_state)); ba0f26d8529c2d arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2018-04-20 318 m->prev_bw_msr = m->prev_msr = tval; a4de1dfdd72653 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 319 return 0; a4de1dfdd72653 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 320 } a4de1dfdd72653 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 321 46637d4570e108 arch/x86/kernel/cpu/resctrl/monitor.c Reinette Chatre 2020-05-05 322 chunks = mbm_overflow_count(m->prev_msr, tval, rr->r->mbm_width); 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 323 m->prev_msr = tval; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 324 4868a61d498af3 arch/x86/kernel/cpu/resctrl/monitor.c Fenghua Yu 2020-10-14 325 rr->val += get_corrected_mbm_count(rmid, m->chunks); 4868a61d498af3 arch/x86/kernel/cpu/resctrl/monitor.c Fenghua Yu 2020-10-14 326 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 327 return 0; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 328 } d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 329 :::::: The code at line 291 was first introduced by commit :::::: ba0f26d8529c2dfc9aa6d9e8a338180737f8c1be x86/intel_rdt/mba_sc: Prepare for feedback loop :::::: TO: Vikas Shivappa <vikas.shivappa(a)linux.intel.com&gt; :::::: CC: Thomas Gleixner <tglx(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org