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    Subject[PATCH 12/16] perf, persistent: Avoid adding identical events
    Date
    From: Robert Richter <robert.richter@calxeda.com>

    Check if an event already exists before adding it.

    Signed-off-by: Robert Richter <robert.richter@calxeda.com>
    ---
    kernel/events/persistent.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/kernel/events/persistent.c b/kernel/events/persistent.c
    index ebef089..1e93b51 100644
    --- a/kernel/events/persistent.c
    +++ b/kernel/events/persistent.c
    @@ -40,6 +40,12 @@ add_persistent_event_on_cpu(unsigned int cpu, struct perf_event_attr *attr,

    mutex_lock(&per_cpu(pers_events_lock, cpu));

    + desc = get_persistent_event(cpu, attr);
    + if (desc) {
    + event = ERR_PTR(-EEXIST);
    + goto out;
    + }
    +
    desc = kzalloc(sizeof(*desc), GFP_KERNEL);
    if (!desc) {
    event = ERR_PTR(-ENOMEM);
    --
    1.8.1.1


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