diff --git a/kernel/events/core.c b/kernel/events/core.c...
index ebf143aa427b..bf97b2fa8a9c 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6955,6 +6958,53 @@ static void perf_pending_irq(struct irq_work *entry)
perf_swevent_put_recursion_context(rctx);
}
+static void perf_pending_unwind_irq(struct irq_work *entry)
+{
+ struct perf_event *event = container_of(entry, struct perf_event, pending_unwind_irq);
+
+ if (event->pending_unwind) {
+ unwind_user_deferred(&perf_unwind_callback_cb, NULL, event);
+ event->pending_unwind = 0;
+ }
+}
+
+struct perf_callchain_deferred_event {
+ struct perf_event_header header;
+ u64 ctx_cookie;
+ u64 nr;
+ u64 ips[];
+};
+
+static void perf_event_callchain_deferred(struct unwind_stacktrace *trace,
+ u64 ctx_cookie, void *_data)
+{
+ struct perf_callchain_deferred_event deferred_event;
+ u64 callchain_context = PERF_CONTEXT_USER;
+ struct perf_output_handle handle;
+ struct perf_event *event = _data;
+ struct perf_sample_data data;
+ u64 nr = trace->nr + 1 /* callchain_context */;
+
+ deferred_event.header.type = PERF_RECORD_CALLCHAIN_DEFERRED;
+ deferred_event.header.misc = PERF_RECORD_MISC_USER;
+ deferred_event.header.size = sizeof(deferred_event) + (nr * sizeof(u64));
+
+ deferred_event.ctx_cookie = ctx_cookie;
+ deferred_event.nr = nr;
+
+ perf_event_header__init_id(&deferred_event.header, &data, event);
+...
+ if (perf_output_begin(&handle, &data, event, deferred_event.header.size))
+ return;
+
+ perf_output_put(&handle, deferred_event);
+ perf_output_put(&handle, callchain_context);
+ perf_output_copy(&handle, trace->entries, trace->nr * sizeof(u64));
+ perf_event__output_id_sample(event, &handle, &data);
+
+ perf_output_end(&handle);
+}
+
static void perf_pending_task(struct callback_head *head)
{
struct perf_event *event = container_of(head, struct perf_event, pending_task);