ANDROID: futex: Add vendor hook for wait queue

Add the hook for the waiter list of futex to allow
vendor perform wait queue enhancement

Bug: 163431711

Signed-off-by: JianMin Liu <jian-min.liu@mediatek.com>
Change-Id: I68218b89c35b23aa5529099bb0bbbd031bdeafef

include/trace/hooks/futex.h

@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM futex
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH trace/hooks
+#if !defined(_TRACE_HOOK_FUTEX_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HOOK_FUTEX_H
+#include <linux/tracepoint.h>
+#include <trace/hooks/vendor_hooks.h>
+#include <linux/plist.h>
+/*
+ * Following tracepoints are not exported in tracefs and provide a
+ * mechanism for vendor modules to hook and extend functionality
+ */
+#if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_ANDROID_VENDOR_HOOKS)
+DECLARE_HOOK(android_vh_alter_futex_plist_add,
+	TP_PROTO(struct plist_node *node,
+		 struct plist_head *head,
+		 bool *already_on_hb),
+	TP_ARGS(node, head, already_on_hb));
+#else
+#define trace_android_vh_alter_futex_plist_add(node, head, already_on_hb)
+#endif
+#endif /* _TRACE_HOOK_FUTEX_H */
+/* This part must be outside protection */
+#include <trace/define_trace.h>