CC: kbuild-all(a)lists.01.org CC: linux-kernel(a)vger.kernel.org CC: x86(a)kernel.org TO: Babu Moger <Babu.Moger(a)amd.com&gt; CC: Borislav Petkov <bp(a)suse.de&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/urgent head: 064855a69003c24bd6b473b367d364e418c57625 commit: 064855a69003c24bd6b473b367d364e418c57625 [2/2] x86/resctrl: Fix default monitoring groups reporting :::::: branch date: 5 hours ago :::::: commit date: 5 hours ago config: i386-randconfig-m021-20210812 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: arch/x86/kernel/cpu/resctrl/monitor.c:310 __mon_event_count() error: uninitialized symbol 'm'. arch/x86/kernel/cpu/resctrl/monitor.c:315 __mon_event_count() error: potentially dereferencing uninitialized 'm'. vim +/m +310 arch/x86/kernel/cpu/resctrl/monitor.c ba0f26d8529c2d arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2018-04-20 287 064855a69003c2 arch/x86/kernel/cpu/resctrl/monitor.c Babu Moger 2021-08-02 288 static u64 __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)) { 064855a69003c2 arch/x86/kernel/cpu/resctrl/monitor.c Babu Moger 2021-08-02 295 return tval; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 296 } d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 297 switch (rr->evtid) { d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 298 case QOS_L3_OCCUP_EVENT_ID: d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 299 rr->val += tval; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 300 return 0; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 301 case QOS_L3_MBM_TOTAL_EVENT_ID: 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 302 m = &rr->d->mbm_total[rmid]; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 303 break; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 304 case QOS_L3_MBM_LOCAL_EVENT_ID: 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 305 m = &rr->d->mbm_local[rmid]; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 306 break; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 307 } a4de1dfdd72653 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 308 a4de1dfdd72653 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 309 if (rr->first) { ba0f26d8529c2d arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2018-04-20 @310 memset(m, 0, sizeof(struct mbm_state)); ba0f26d8529c2d arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2018-04-20 311 m->prev_bw_msr = m->prev_msr = tval; a4de1dfdd72653 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 312 return 0; a4de1dfdd72653 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 313 } a4de1dfdd72653 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 314 46637d4570e108 arch/x86/kernel/cpu/resctrl/monitor.c Reinette Chatre 2020-05-05 @315 chunks = mbm_overflow_count(m->prev_msr, tval, rr->r->mbm_width); 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 316 m->chunks += chunks; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 317 m->prev_msr = tval; 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 318 4868a61d498af3 arch/x86/kernel/cpu/resctrl/monitor.c Fenghua Yu 2020-10-14 319 rr->val += get_corrected_mbm_count(rmid, m->chunks); 4868a61d498af3 arch/x86/kernel/cpu/resctrl/monitor.c Fenghua Yu 2020-10-14 320 9f52425ba303d9 arch/x86/kernel/cpu/intel_rdt_monitor.c Tony Luck 2017-07-25 321 return 0; d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 322 } d89b7379015fc5 arch/x86/kernel/cpu/intel_rdt_monitor.c Vikas Shivappa 2017-07-25 323 :::::: The code at line 310 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