1 files changed, 28 insertions, 2 deletions

diff --git a/kernel/events/core.c b/kernel/events/core.c
index f1cf0edeb39a..b7935fcec7d9 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4039,7 +4039,7 @@ void perf_prepare_sample(struct perf_event_header *header,
         if (sample_type & PERF_SAMPLE_CALLCHAIN) {
                 int size = 1;
 
-                data->callchain = perf_callchain(regs);
+                data->callchain = perf_callchain(event, regs);
 
                 if (data->callchain)
                         size += data->callchain->nr;
@@ -5209,7 +5209,8 @@ static int perf_tp_event_match(struct perf_event *event,
 }
 
 void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
-                   struct pt_regs *regs, struct hlist_head *head, int rctx)
+                   struct pt_regs *regs, struct hlist_head *head, int rctx,
+                   struct task_struct *task)
 {
         struct perf_sample_data data;
         struct perf_event *event;
@@ -5228,6 +5229,31 @@ void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
                         perf_swevent_event(event, count, &data, regs);
         }
 
+        /*
+         * If we got specified a target task, also iterate its context and
+         * deliver this event there too.
+         */
+        if (task && task != current) {
+                struct perf_event_context *ctx;
+                struct trace_entry *entry = record;
+
+                rcu_read_lock();
+                ctx = rcu_dereference(task->perf_event_ctxp[perf_sw_context]);
+                if (!ctx)
+                        goto unlock;
+
+                list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
+                        if (event->attr.type != PERF_TYPE_TRACEPOINT)
+                                continue;
+                        if (event->attr.config != entry->type)
+                                continue;
+                        if (perf_tp_event_match(event, &data, regs))
+                                perf_swevent_event(event, count, &data, regs);
+                }
+unlock:
+                rcu_read_unlock();
+        }
+
         perf_swevent_put_recursion_context(rctx);
 }
 EXPORT_SYMBOL_GPL(perf_tp_event);