Merge tag 'trace-v5.18-2' of git://git.kernel.org/pub/scm/linux/kerne…

…l/git/rostedt/linux-trace

Pull more tracing updates from Steven Rostedt:

 - Rename the staging files to give them some meaning. Just
   stage1,stag2,etc, does not show what they are for

 - Check for NULL from allocation in bootconfig

 - Hold event mutex for dyn_event call in user events

 - Mark user events to broken (to work on the API)

 - Remove eBPF updates from user events

 - Remove user events from uapi header to keep it from being installed.

 - Move ftrace_graph_is_dead() into inline as it is called from hot
   paths and also convert it into a static branch.

* tag 'trace-v5.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Move user_events.h temporarily out of include/uapi
  ftrace: Make ftrace_graph_is_dead() a static branch
  tracing: Set user_events to BROKEN
  tracing/user_events: Remove eBPF interfaces
  tracing/user_events: Hold event_mutex during dyn_event_add
  proc: bootconfig: Add null pointer check
  tracing: Rename the staging files for trace_events

Documentation/trace/user_events.rst

@@ -7,7 +7,7 @@ user_events: User-based Event Tracing
 Overview
 --------
 User based trace events allow user processes to create events and trace data
-that can be viewed via existing tools, such as ftrace, perf and eBPF.
+that can be viewed via existing tools, such as ftrace and perf.
 To enable this feature, build your kernel with CONFIG_USER_EVENTS=y.
 
 Programs can view status of the events via
@@ -67,8 +67,7 @@ The command string format is as follows::
 
 Supported Flags
 ^^^^^^^^^^^^^^^
-**BPF_ITER** - EBPF programs attached to this event will get the raw iovec
-struct instead of any data copies for max performance.
+None yet
 
 Field Format
 ^^^^^^^^^^^^
@@ -160,7 +159,7 @@ The following values are defined to aid in checking what has been attached:
 
 **EVENT_STATUS_FTRACE** - Bit set if ftrace has been attached (Bit 0).
 
-**EVENT_STATUS_PERF** - Bit set if perf/eBPF has been attached (Bit 1).
+**EVENT_STATUS_PERF** - Bit set if perf has been attached (Bit 1).
 
 Writing Data
 ------------
@@ -204,13 +203,6 @@ It's advised for user programs to do the following::
 
 **NOTE:** *The write_index is not emitted out into the trace being recorded.*
 
-EBPF
-----
-EBPF programs that attach to a user-based event tracepoint are given a pointer
-to a struct user_bpf_context. The bpf context contains the data type (which can
-be a user or kernel buffer, or can be a pointer to the iovec) and the data
-length that was emitted (minus the write_index).
-
 Example Code
 ------------
 See sample code in samples/user_events.

fs/proc/bootconfig.c

@@ -32,6 +32,8 @@ static int __init copy_xbc_key_value_list(char *dst, size_t size)
 	int ret = 0;
 
 	key = kzalloc(XBC_KEYLEN_MAX, GFP_KERNEL);
+	if (!key)
+		return -ENOMEM;
 
 	xbc_for_each_key_value(leaf, val) {
 		ret = xbc_node_compose_key(leaf, key, XBC_KEYLEN_MAX);

include/linux/ftrace.h

@@ -9,6 +9,7 @@
 
 #include <linux/trace_recursion.h>
 #include <linux/trace_clock.h>
+#include <linux/jump_label.h>
 #include <linux/kallsyms.h>
 #include <linux/linkage.h>
 #include <linux/bitops.h>
@@ -1018,7 +1019,20 @@ unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
 extern int register_ftrace_graph(struct fgraph_ops *ops);
 extern void unregister_ftrace_graph(struct fgraph_ops *ops);
 
-extern bool ftrace_graph_is_dead(void);
+/**
+ * ftrace_graph_is_dead - returns true if ftrace_graph_stop() was called
+ *
+ * ftrace_graph_stop() is called when a severe error is detected in
+ * the function graph tracing. This function is called by the critical
+ * paths of function graph to keep those paths from doing any more harm.
+ */
+DECLARE_STATIC_KEY_FALSE(kill_ftrace_graph);
+
+static inline bool ftrace_graph_is_dead(void)
+{
+	return static_branch_unlikely(&kill_ftrace_graph);
+}
+
 extern void ftrace_graph_stop(void);
 
 /* The current handlers in use */

include/linux/user_events.h

@@ -32,9 +32,6 @@
 /* Create dynamic location entry within a 32-bit value */
 #define DYN_LOC(offset, size) ((size) << 16 | (offset))
 
-/* Use raw iterator for attached BPF program(s), no affect on ftrace/perf */
-#define FLAG_BPF_ITER (1 << 0)
-
 /*
  * Describes an event registration and stores the results of the registration.
  * This structure is passed to the DIAG_IOCSREG ioctl, callers at a minimum
@@ -63,54 +60,4 @@ struct user_reg {
 /* Requests to delete a user_event */
 #define DIAG_IOCSDEL _IOW(DIAG_IOC_MAGIC, 1, char*)
 
-/* Data type that was passed to the BPF program */
-enum {
-	/* Data resides in kernel space */
-	USER_BPF_DATA_KERNEL,
-
-	/* Data resides in user space */
-	USER_BPF_DATA_USER,
-
-	/* Data is a pointer to a user_bpf_iter structure */
-	USER_BPF_DATA_ITER,
-};
-
-/*
- * Describes an iovec iterator that BPF programs can use to access data for
- * a given user_event write() / writev() call.
- */
-struct user_bpf_iter {
-
-	/* Offset of the data within the first iovec */
-	__u32 iov_offset;
-
-	/* Number of iovec structures */
-	__u32 nr_segs;
-
-	/* Pointer to iovec structures */
-	const struct iovec *iov;
-};
-
-/* Context that BPF programs receive when attached to a user_event */
-struct user_bpf_context {
-
-	/* Data type being passed (see union below) */
-	__u32 data_type;
-
-	/* Length of the data */
-	__u32 data_len;
-
-	/* Pointer to data, varies by data type */
-	union {
-		/* Kernel data (data_type == USER_BPF_DATA_KERNEL) */
-		void *kdata;
-
-		/* User data (data_type == USER_BPF_DATA_USER) */
-		void *udata;
-
-		/* Direct iovec (data_type == USER_BPF_DATA_ITER) */
-		struct user_bpf_iter *iter;
-	};
-};
-
 #endif /* _UAPI_LINUX_USER_EVENTS_H */

include/trace/trace_custom_events.h

@@ -35,7 +35,7 @@
 
 /* Stage 1 creates the structure of the recorded event layout */
 
-#include "stages/stage1_defines.h"
+#include "stages/stage1_struct_define.h"
 
 #undef DECLARE_CUSTOM_EVENT_CLASS
 #define DECLARE_CUSTOM_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
@@ -56,7 +56,7 @@
 
 /* Stage 2 creates the custom class */
 
-#include "stages/stage2_defines.h"
+#include "stages/stage2_data_offsets.h"
 
 #undef DECLARE_CUSTOM_EVENT_CLASS
 #define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
@@ -71,7 +71,7 @@
 
 /* Stage 3 create the way to print the custom event */
 
-#include "stages/stage3_defines.h"
+#include "stages/stage3_trace_output.h"
 
 #undef DECLARE_CUSTOM_EVENT_CLASS
 #define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
@@ -102,7 +102,7 @@ static struct trace_event_functions trace_custom_event_type_funcs_##call = { \
 
 /* Stage 4 creates the offset layout for the fields */
 
-#include "stages/stage4_defines.h"
+#include "stages/stage4_event_fields.h"
 
 #undef DECLARE_CUSTOM_EVENT_CLASS
 #define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, func, print)	\
@@ -114,7 +114,7 @@ static struct trace_event_fields trace_custom_event_fields_##call[] = {	\
 
 /* Stage 5 creates the helper function for dynamic fields */
 
-#include "stages/stage5_defines.h"
+#include "stages/stage5_get_offsets.h"
 
 #undef DECLARE_CUSTOM_EVENT_CLASS
 #define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
@@ -134,7 +134,7 @@ static inline notrace int trace_custom_event_get_offsets_##call(	\
 
 /* Stage 6 creates the probe function that records the event */
 
-#include "stages/stage6_defines.h"
+#include "stages/stage6_event_callback.h"
 
 #undef DECLARE_CUSTOM_EVENT_CLASS
 #define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
@@ -182,7 +182,7 @@ static inline void ftrace_test_custom_probe_##call(void)		\
 
 /* Stage 7 creates the actual class and event structure for the custom event */
 
-#include "stages/stage7_defines.h"
+#include "stages/stage7_class_define.h"
 
 #undef DECLARE_CUSTOM_EVENT_CLASS
 #define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \

include/trace/trace_events.h

@@ -45,7 +45,7 @@
 			     PARAMS(print));		       \
 	DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
 
-#include "stages/stage1_defines.h"
+#include "stages/stage1_struct_define.h"
 
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)	\
@@ -109,7 +109,7 @@
  * The size of an array is also encoded, in the higher 16 bits of <item>.
  */
 
-#include "stages/stage2_defines.h"
+#include "stages/stage2_data_offsets.h"
 
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
@@ -181,7 +181,7 @@
  * in binary.
  */
 
-#include "stages/stage3_defines.h"
+#include "stages/stage3_trace_output.h"
 
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
@@ -236,7 +236,7 @@ static struct trace_event_functions trace_event_type_funcs_##call = {	\
 
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
-#include "stages/stage4_defines.h"
+#include "stages/stage4_event_fields.h"
 
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)	\
@@ -249,7 +249,7 @@ static struct trace_event_fields trace_event_fields_##call[] = {	\
 
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
-#include "stages/stage5_defines.h"
+#include "stages/stage5_get_offsets.h"
 
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
@@ -372,7 +372,7 @@ static inline notrace int trace_event_get_offsets_##call(		\
 #define _TRACE_PERF_INIT(call)
 #endif /* CONFIG_PERF_EVENTS */
 
-#include "stages/stage6_defines.h"
+#include "stages/stage6_event_callback.h"
 
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
@@ -418,7 +418,7 @@ static inline void ftrace_test_probe_##call(void)			\
 
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
-#include "stages/stage7_defines.h"
+#include "stages/stage7_class_define.h"
 
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\

kernel/trace/fgraph.c

@@ -7,6 +7,7 @@
  *
  * Highly modified by Steven Rostedt (VMware).
  */
+#include <linux/jump_label.h>
 #include <linux/suspend.h>
 #include <linux/ftrace.h>
 #include <linux/slab.h>
@@ -23,24 +24,12 @@
 #define ASSIGN_OPS_HASH(opsname, val)
 #endif
 
-static bool kill_ftrace_graph;
+DEFINE_STATIC_KEY_FALSE(kill_ftrace_graph);
 int ftrace_graph_active;
 
 /* Both enabled by default (can be cleared by function_graph tracer flags */
 static bool fgraph_sleep_time = true;
 
-/**
- * ftrace_graph_is_dead - returns true if ftrace_graph_stop() was called
- *
- * ftrace_graph_stop() is called when a severe error is detected in
- * the function graph tracing. This function is called by the critical
- * paths of function graph to keep those paths from doing any more harm.
- */
-bool ftrace_graph_is_dead(void)
-{
-	return kill_ftrace_graph;
-}
-
 /**
  * ftrace_graph_stop - set to permanently disable function graph tracing
  *
@@ -51,7 +40,7 @@ bool ftrace_graph_is_dead(void)
  */
 void ftrace_graph_stop(void)
 {
-	kill_ftrace_graph = true;
+	static_branch_enable(&kill_ftrace_graph);
 }
 
 /* Add a function return address to the trace stack on thread info.*/