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perf_events: Fix stale ->cgrp pointer in update_cgrp_time_from_cpuctx()

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This patch solves a stale pointer problem in
update_cgrp_time_from_cpuctx(). The cpuctx->cgrp
was not cleared on all possible event exit paths,
including:

   close()
     perf_release()
       perf_release_kernel()
         list_del_event()

This patch fixes list_del_event() to clear cpuctx->cgrp
when there are no cgroup events left in the context.

[ This second version makes the code compile when
  CONFIG_CGROUP_PERF is not enabled. We unconditionally define
  perf_cpu_context->cgrp. ]

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: perfmon2-devel@lists.sf.net
Cc: paulus@samba.org
Cc: davem@davemloft.net
LKML-Reference: <20110323150306.GA1580@quad>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Stephane Eranian 2011-03-23 16:03:06 +01:00 • committed by Ingo Molnar
parent ce2d17ca7f
commit 68cacd2916
2 changed files with 11 additions and 3 deletions
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2
include/linux/perf_event.h
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@ -938,9 +938,7 @@ struct perf_cpu_context {
struct list_head rotation_list;
int jiffies_interval;
struct pmu *active_pmu;
#ifdef CONFIG_CGROUP_PERF
struct perf_cgroup *cgrp;
#endif
};
struct perf_output_handle {