tracing/probes: Move event parameter fetching code to common parser

Move trace event parameter fetching code to common parser in
trace_probe.c. This simplifies eprobe's trace-event variable fetching
code by introducing a parse context data structure.

Link: https://lore.kernel.org/all/168507472950.913472.2812253181558471278.stgit@mhiramat.roam.corp.google.com/

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index e6b94fcdb886..f622340ae171 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -378,8 +378,15 @@ static inline bool tparg_is_function_entry(unsigned int flags)
 	return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_FENTRY);
 }
 
+struct traceprobe_parse_context {
+	struct trace_event_call *event;
+	unsigned int flags;
+	int offset;
+};
+
 extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i,
-				const char *argv, unsigned int flags);
+				      const char *argv,
+				      struct traceprobe_parse_context *ctx);
 
 extern int traceprobe_update_arg(struct probe_arg *arg);
 extern void traceprobe_free_probe_arg(struct probe_arg *arg);