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[PATCH v11 05/28] tracing: Add get_syscall_name()

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Add a utility function to grab the syscall name from the syscall
metadata, given a syscall id.

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
 kernel/trace/trace.h          |  5 +++++
 kernel/trace/trace_syscalls.c | 11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index bc039bc..892335a 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1390,8 +1390,13 @@ int perf_ftrace_event_register(struct trace_event_call *call,
 
 #ifdef CONFIG_FTRACE_SYSCALLS
 void init_ftrace_syscalls(void);
+const char *get_syscall_name(int syscall);
 #else
 static inline void init_ftrace_syscalls(void) { }
+static inline const char *get_syscall_name(int syscall)
+{
+	return NULL;
+}
 #endif
 
 #ifdef CONFIG_EVENT_TRACING
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 0655afb..50be560 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -106,6 +106,17 @@ static struct syscall_metadata *syscall_nr_to_meta(int nr)
 	return syscalls_metadata[nr];
 }
 
+const char *get_syscall_name(int syscall)
+{
+	struct syscall_metadata *entry;
+
+	entry = syscall_nr_to_meta(syscall);
+	if (!entry)
+		return NULL;
+
+	return entry->name;
+}
+
 static enum print_line_t
 print_syscall_enter(struct trace_iterator *iter, int flags,
 		    struct trace_event *event)
-- 
1.9.3

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Thread

[PATCH 00/28] tracing: 'hist' triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:20 +0200
  [PATCH v11 16/28] tracing: Add hist trigger 'sym' and 'sym-offset' modifiers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:20 +0200
  [PATCH v11 12/28] tracing: Add hist trigger support for user-defined sorting ('sort=' param) Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:20 +0200
  [PATCH v11 01/28] tracing: Update cond flag when enabling or disabling a trigger Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 27/28] kselftests/ftrace : Add event trigger testcases Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 10/28] tracing: Add hist trigger support for multiple values ('vals=' param) Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 06/28] tracing: Add a per-event-trigger 'paused' field Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 25/28] tracing: Add support for named triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 18/28] tracing: Add hist trigger 'syscall' modifier Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 03/28] tracing: Make event trigger functions available Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 04/28] tracing: Add event record param to trigger_ops.func() Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  Re: [PATCH 00/28] tracing: 'hist' triggers Steven Rostedt <rostedt@goodmis.org> - 2015-10-22 20:30 +0200
    Re: [PATCH 00/28] tracing: 'hist' triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:40 +0200
  [PATCH v11 05/28] tracing: Add get_syscall_name() Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  Re: [PATCH v11 08/28] tracing: Add lock-free tracing_map Namhyung Kim <namhyung@kernel.org> - 2015-10-29 09:40 +0100
    Re: [PATCH v11 08/28] tracing: Add lock-free tracing_map Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-29 19:40 +0100

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