1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TRACE_H 3 #define _LINUX_TRACE_H 4 5 #ifdef CONFIG_TRACING 6 /* 7 * The trace export - an export of Ftrace output. The trace_export 8 * can process traces and export them to a registered destination as 9 * an addition to the current only output of Ftrace - i.e. ring buffer. 10 * 11 * If you want traces to be sent to some other place rather than ring 12 * buffer only, just need to register a new trace_export and implement 13 * its own .write() function for writing traces to the storage. 14 * 15 * next - pointer to the next trace_export 16 * write - copy traces which have been delt with ->commit() to 17 * the destination 18 */ 19 struct trace_export { 20 struct trace_export __rcu *next; 21 void (*write)(struct trace_export *, const void *, unsigned int); 22 }; 23 24 int register_ftrace_export(struct trace_export *export); 25 int unregister_ftrace_export(struct trace_export *export); 26 27 #endif /* CONFIG_TRACING */ 28 29 #endif /* _LINUX_TRACE_H */ 30