bpf: sync bpf.h to tools/

Fix a 'struct pt_reg' typo and clarify when bpf_trace_printk discards
lines. Affects documentation only.

Signed-off-by: Peter Wu <peter@lekensteyn.nl>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 8aa6126..b588925 100644 (file)
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -580,6 +580,8 @@ union bpf_attr {
  *             limited to five).
  *
  *             Each time the helper is called, it appends a line to the trace.
+ *             Lines are discarded while *\/sys/kernel/debug/tracing/trace* is
+ *             open, use *\/sys/kernel/debug/tracing/trace_pipe* to avoid this.
  *             The format of the trace is customizable, and the exact output
  *             one will get depends on the options set in
  *             *\/sys/kernel/debug/tracing/trace_options* (see also the
@@ -1018,7 +1020,7 @@ union bpf_attr {
  *             The realm of the route for the packet associated to *skb*, or 0
  *             if none was found.
  *
- * int bpf_perf_event_output(struct pt_reg *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
+ * int bpf_perf_event_output(struct pt_regs *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
  *     Description
  *             Write raw *data* blob into a special BPF perf event held by
  *             *map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
@@ -1080,7 +1082,7 @@ union bpf_attr {
  *     Return
  *             0 on success, or a negative error in case of failure.
  *
- * int bpf_get_stackid(struct pt_reg *ctx, struct bpf_map *map, u64 flags)
+ * int bpf_get_stackid(struct pt_regs *ctx, struct bpf_map *map, u64 flags)
  *     Description
  *             Walk a user or a kernel stack and return its id. To achieve
  *             this, the helper needs *ctx*, which is a pointer to the context
@@ -1729,7 +1731,7 @@ union bpf_attr {
  *     Return
  *             0 on success, or a negative error in case of failure.
  *
- * int bpf_override_return(struct pt_reg *regs, u64 rc)
+ * int bpf_override_return(struct pt_regs *regs, u64 rc)
  *     Description
  *             Used for error injection, this helper uses kprobes to override
  *             the return value of the probed function, and to set it to *rc*.