:::::: :::::: Manual check reason: "low confidence static check warning: arch/x86/events/amd/lbr.c:79:36: sparse: sparse: invalid access past the end of 'entry' (12 16)" ::::::
BCC: [email protected] CC: [email protected] CC: [email protected] TO: Sandipan Das <[email protected]> CC: Peter Zijlstra <[email protected]> tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/core head: 3a8b83ed8cff6da47a4e157d5e7bd461554149ec commit: a499b4b06c9f978dc69ca4058cd3346075dc7870 [6/13] perf/x86/amd/lbr: Add LbrExtV2 branch record support :::::: branch date: 9 hours ago :::::: commit date: 9 hours ago config: i386-randconfig-s002 (https://download.01.org/0day-ci/archive/20220819/[email protected]/config) compiler: gcc-11 (Debian 11.3.0-5) 11.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-39-gce1a6720-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=a499b4b06c9f978dc69ca4058cd3346075dc7870 git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue perf/core git checkout a499b4b06c9f978dc69ca4058cd3346075dc7870 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/events/amd/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <[email protected]> sparse warnings: (new ones prefixed by >>) >> arch/x86/events/amd/lbr.c:79:36: sparse: sparse: invalid access past the end >> of 'entry' (12 16) vim +/entry +79 arch/x86/events/amd/lbr.c a499b4b06c9f97 Sandipan Das 2022-08-11 63 a499b4b06c9f97 Sandipan Das 2022-08-11 64 void amd_pmu_lbr_read(void) a499b4b06c9f97 Sandipan Das 2022-08-11 65 { a499b4b06c9f97 Sandipan Das 2022-08-11 66 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); a499b4b06c9f97 Sandipan Das 2022-08-11 67 struct perf_branch_entry *br = cpuc->lbr_entries; a499b4b06c9f97 Sandipan Das 2022-08-11 68 struct branch_entry entry; a499b4b06c9f97 Sandipan Das 2022-08-11 69 int out = 0, i; a499b4b06c9f97 Sandipan Das 2022-08-11 70 a499b4b06c9f97 Sandipan Das 2022-08-11 71 if (!cpuc->lbr_users) a499b4b06c9f97 Sandipan Das 2022-08-11 72 return; a499b4b06c9f97 Sandipan Das 2022-08-11 73 a499b4b06c9f97 Sandipan Das 2022-08-11 74 for (i = 0; i < x86_pmu.lbr_nr; i++) { a499b4b06c9f97 Sandipan Das 2022-08-11 75 entry.from.full = amd_pmu_lbr_get_from(i); a499b4b06c9f97 Sandipan Das 2022-08-11 76 entry.to.full = amd_pmu_lbr_get_to(i); a499b4b06c9f97 Sandipan Das 2022-08-11 77 a499b4b06c9f97 Sandipan Das 2022-08-11 78 /* Check if a branch has been logged */ a499b4b06c9f97 Sandipan Das 2022-08-11 @79 if (!entry.to.split.valid) a499b4b06c9f97 Sandipan Das 2022-08-11 80 continue; a499b4b06c9f97 Sandipan Das 2022-08-11 81 a499b4b06c9f97 Sandipan Das 2022-08-11 82 perf_clear_branch_entry_bitfields(br + out); a499b4b06c9f97 Sandipan Das 2022-08-11 83 a499b4b06c9f97 Sandipan Das 2022-08-11 84 br[out].from = sign_ext_branch_ip(entry.from.split.ip); a499b4b06c9f97 Sandipan Das 2022-08-11 85 br[out].to = sign_ext_branch_ip(entry.to.split.ip); a499b4b06c9f97 Sandipan Das 2022-08-11 86 br[out].mispred = entry.from.split.mispredict; a499b4b06c9f97 Sandipan Das 2022-08-11 87 br[out].predicted = !br[out].mispred; a499b4b06c9f97 Sandipan Das 2022-08-11 88 out++; a499b4b06c9f97 Sandipan Das 2022-08-11 89 } a499b4b06c9f97 Sandipan Das 2022-08-11 90 a499b4b06c9f97 Sandipan Das 2022-08-11 91 cpuc->lbr_stack.nr = out; a499b4b06c9f97 Sandipan Das 2022-08-11 92 a499b4b06c9f97 Sandipan Das 2022-08-11 93 /* a499b4b06c9f97 Sandipan Das 2022-08-11 94 * Internal register renaming always ensures that LBR From[0] and a499b4b06c9f97 Sandipan Das 2022-08-11 95 * LBR To[0] always represent the TOS a499b4b06c9f97 Sandipan Das 2022-08-11 96 */ a499b4b06c9f97 Sandipan Das 2022-08-11 97 cpuc->lbr_stack.hw_idx = 0; a499b4b06c9f97 Sandipan Das 2022-08-11 98 } a499b4b06c9f97 Sandipan Das 2022-08-11 99 -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
