tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2018.10.03a head: ef44a26c84188888f97e5d7b3f8e4f8c0decd248 commit: 813f47a94e3b61439bba90340b532f3a6319d4f5 [44/73] rcu: Print per-CPU callback counts for forward-progress failures config: x86_64-randconfig-x006-10081527 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: git checkout 813f47a94e3b61439bba90340b532f3a6319d4f5 # save the attached .config to linux build tree make ARCH=x86_64
Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): kernel/rcu/tree.c: In function 'rcu_fwd_progress_check': >> kernel/rcu/tree.c:2704:5: warning: 'max_cpu' may be used uninitialized in >> this function [-Wmaybe-uninitialized] if (max_cpu >= 0) ^ >> kernel/rcu/tree.c:2699:6: warning: 'max_cbs' may be used uninitialized in >> this function [-Wmaybe-uninitialized] if (cbs <= max_cbs) ^ vim +/max_cpu +2704 kernel/rcu/tree.c 2670 2671 /* 2672 * Do a forward-progress check for rcutorture. This is normally invoked 2673 * due to an OOM event. The argument "j" gives the time period during 2674 * which rcutorture would like progress to have been made. 2675 */ 2676 void rcu_fwd_progress_check(unsigned long j) 2677 { 2678 unsigned long cbs; 2679 int cpu; 2680 unsigned long max_cbs; 2681 int max_cpu; 2682 struct rcu_data *rdp; 2683 2684 if (rcu_gp_in_progress()) { 2685 show_rcu_gp_kthreads(); 2686 } else { 2687 preempt_disable(); 2688 rdp = this_cpu_ptr(&rcu_data); 2689 rcu_check_gp_start_stall(rdp->mynode, rdp, j); 2690 preempt_enable(); 2691 } 2692 for_each_possible_cpu(cpu) { 2693 cbs = rcu_get_n_cbs_cpu(cpu); 2694 if (!cbs) 2695 continue; 2696 if (max_cpu < 0) 2697 pr_info("%s: callbacks", __func__); 2698 pr_cont(" %d: %lu", cpu, cbs); > 2699 if (cbs <= max_cbs) 2700 continue; 2701 max_cbs = cbs; 2702 max_cpu = cpu; 2703 } > 2704 if (max_cpu >= 0) 2705 pr_cont("\n"); 2706 } 2707 EXPORT_SYMBOL_GPL(rcu_fwd_progress_check); 2708 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
.config.gz
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