[PATCH 06/14] tracing: export syscall metadata

[zhangwei(Jovi)]

From: "zhangwei(Jovi)" <jovi.zhangwei@xxxxxxxxxx>

Currently syscall metadata is important for kernel
syscall tracing, even mandatory, external modules may need this
metadata when perform syscall tracing(like ktap tool), so export it.

Instead of export variable syscalls_metadata, export function
syscall_nr_to_meta is more safe.

This patch also rename syscall_nr_to_meta to trace_syscall_nr_to_metadata.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@xxxxxxxxxx>
---
 include/trace/syscall.h       |    1 +
 kernel/trace/trace_syscalls.c |   15 ++++++++-------
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/include/trace/syscall.h b/include/trace/syscall.h
index 84bc419..428634e 100644
--- a/include/trace/syscall.h
+++ b/include/trace/syscall.h
@@ -31,4 +31,5 @@ struct syscall_metadata {
 	struct ftrace_event_call *exit_event;
 };
 
+struct syscall_metadata *trace_syscall_nr_to_meta(int nr);
 #endif /* _TRACE_SYSCALL_H */
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 72675b1..d739471 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -98,13 +98,14 @@ find_syscall_meta(unsigned long syscall)
 	return NULL;
 }
 
-static struct syscall_metadata *syscall_nr_to_meta(int nr)
+struct syscall_metadata *trace_syscall_nr_to_meta(int nr)
 {
 	if (!syscalls_metadata || nr >= NR_syscalls || nr < 0)
 		return NULL;
 
 	return syscalls_metadata[nr];
 }
+EXPORT_SYMBOL_GPL(trace_syscall_nr_to_meta);
 
 static enum print_line_t
 print_syscall_enter(struct trace_iterator *iter, int flags,
@@ -118,7 +119,7 @@ print_syscall_enter(struct trace_iterator *iter, int flags,
 
 	trace = (typeof(trace))ent;
 	syscall = trace->nr;
-	entry = syscall_nr_to_meta(syscall);
+	entry = trace_syscall_nr_to_meta(syscall);
 
 	if (!entry)
 		goto end;
@@ -172,7 +173,7 @@ print_syscall_exit(struct trace_iterator *iter, int flags,
 
 	trace = (typeof(trace))ent;
 	syscall = trace->nr;
-	entry = syscall_nr_to_meta(syscall);
+	entry = trace_syscall_nr_to_meta(syscall);
 
 	if (!entry) {
 		trace_seq_printf(s, "\n");
@@ -315,7 +316,7 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
 	if (!test_bit(syscall_nr, tr->enabled_enter_syscalls))
 		return;
 
-	sys_data = syscall_nr_to_meta(syscall_nr);
+	sys_data = trace_syscall_nr_to_meta(syscall_nr);
 	if (!sys_data)
 		return;
 
@@ -349,7 +350,7 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
 	if (!test_bit(syscall_nr, tr->enabled_exit_syscalls))
 		return;
 
-	sys_data = syscall_nr_to_meta(syscall_nr);
+	sys_data = trace_syscall_nr_to_meta(syscall_nr);
 	if (!sys_data)
 		return;
 
@@ -545,7 +546,7 @@ static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id)
 	if (!test_bit(syscall_nr, enabled_perf_enter_syscalls))
 		return;
 
-	sys_data = syscall_nr_to_meta(syscall_nr);
+	sys_data = trace_syscall_nr_to_meta(syscall_nr);
 	if (!sys_data)
 		return;
 
@@ -621,7 +622,7 @@ static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
 	if (!test_bit(syscall_nr, enabled_perf_exit_syscalls))
 		return;
 
-	sys_data = syscall_nr_to_meta(syscall_nr);
+	sys_data = trace_syscall_nr_to_meta(syscall_nr);
 	if (!sys_data)
 		return;
 
-- 
1.7.9.7


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