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authorLinus Torvalds <torvalds@linux-foundation.org>2022-04-03 22:26:01 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-04-03 22:26:01 +0300
commit09bb8856d4a7cf3128dedd79cd07d75bbf4a9f04 (patch)
treed0ae1e3042793fe397ad65f5fdb05bde32de31e9 /include/linux
parent34a53ff911eb30629baad788fbed892f711bdd3e (diff)
parent5cfff569cab8bf544bab62c911c5d6efd5af5e05 (diff)
downloadlinux-09bb8856d4a7cf3128dedd79cd07d75bbf4a9f04.tar.xz
Merge tag 'trace-v5.18-2' of git://git.kernel.org/pub/scm/linux/kernel/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
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/ftrace.h16
-rw-r--r--include/linux/user_events.h53
2 files changed, 15 insertions, 54 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index ed8cf433a46a..4816b7e11047 100644
--- a/include/linux/ftrace.h
+++ b/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 */
diff --git a/include/linux/user_events.h b/include/linux/user_events.h
index e570840571e1..736e05603463 100644
--- a/include/linux/user_events.h
+++ b/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 */