Hi Stephane, [auto build test WARNING on: tip/perf/core] [also build test WARNING on: v4.3 next-20151103]
url: https://github.com/0day-ci/linux/commits/Stephane-Eranian/perf-fix-RCU-issues-with-cgroup-monitoring-mode/20151104-121512 config: i386-randconfig-i0-201544 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): In file included from include/linux/trace_events.h:9:0, from include/trace/syscall.h:6, from include/linux/syscalls.h:81, from init/main.c:18: include/linux/perf_event.h: In function 'perf_cgroup_from_task': >> include/linux/perf_event.h:702:7: warning: unused variable 'safe' >> [-Wunused-variable] bool safe = ctx ? lockdep_is_held(&ctx->lock) : true; ^ vim +/safe +702 include/linux/perf_event.h 686 u64 timestamp; 687 }; 688 689 struct perf_cgroup { 690 struct cgroup_subsys_state css; 691 struct perf_cgroup_info __percpu *info; 692 }; 693 694 /* 695 * Must ensure cgroup is pinned (css_get) before calling 696 * this function. In other words, we cannot call this function 697 * if there is no cgroup event for the current CPU context. 698 */ 699 static inline struct perf_cgroup * 700 perf_cgroup_from_task(struct task_struct *task, struct perf_event_context *ctx) 701 { > 702 bool safe = ctx ? lockdep_is_held(&ctx->lock) : true; 703 return container_of(task_css_check(task, perf_event_cgrp_id, safe), 704 struct perf_cgroup, css); 705 } 706 #endif /* CONFIG_CGROUP_PERF */ 707 708 #ifdef CONFIG_PERF_EVENTS 709 710 extern void *perf_aux_output_begin(struct perf_output_handle *handle, --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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