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

From: kbuild test robot
Date: Tue Nov 03 2015 - 23:30:38 EST

Hi Stephane,

[auto build test ERROR on: tip/perf/core]
[also build test ERROR on: v4.3 next-20151103]

config: parisc-allyesconfig (attached as .config)
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=parisc

All errors (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 kernel/events/core.c:34:
include/linux/perf_event.h: In function 'perf_cgroup_from_task':
>> include/linux/perf_event.h:702:2: error: implicit declaration of function 'lockdep_is_held' [-Werror=implicit-function-declaration]
bool safe = ctx ? lockdep_is_held(&ctx->lock) : true;
include/linux/perf_event.h:702:7: warning: unused variable 'safe' [-Wunused-variable]
bool safe = ctx ? lockdep_is_held(&ctx->lock) : true;
cc1: some warnings being treated as errors

vim +/lockdep_is_held +702 include/linux/perf_event.h

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 }

0-DAY kernel test infrastructure Open Source Technology Center Intel Corporation

Attachment: .config.gz
Description: Binary data