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SubjectRe: [PATCH v3] perf: fix RCU issues with cgroup monitoring mode
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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