linux-kernel - [PATCH v4 3/7] tracing: Add get_syscall

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Message-Id: <2a2dc0065d183debc3420204b8979a599c21d523.1428678702.git.tom.zanussi@linux.intel.com>
Date:	Fri, 10 Apr 2015 11:05:54 -0500
From:	Tom Zanussi <tom.zanussi@...ux.intel.com>
To:	rostedt@...dmis.org
Cc:	masami.hiramatsu.pt@...achi.com, namhyung@...nel.org,
	andi@...stfloor.org, alexei.starovoitov@...il.com,
	linux-kernel@...r.kernel.org,
	Tom Zanussi <tom.zanussi@...ux.intel.com>
Subject: [PATCH v4 3/7] tracing: Add get_syscall_name()

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

Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.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 89dd87a..3d38c2e 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1317,8 +1317,13 @@ int perf_ftrace_event_register(struct ftrace_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 f97f6e3..d137e0a 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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