[PATCH v3 1/2] tracing/syscalls: Rename variable 'nr' to '__syscall_nr'

[Taeung Song]

There is a problem about duplicated variable name i.e.

    # cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_io_getevents/format
    name: sys_enter_io_getevents
    ID: 739
    format:
            field:unsigned short common_type; offset:0;  size:2; signed:0;
            field:unsigned char common_flags; offset:2;  size:1; signed:0;
            field:unsigned char common_preempt_count; offset:3; size:1; signed:0;
            field:int common_pid;offset:4;size:4;signed:1;
            field:int nr;                     offset:8;  size:4; signed:1;
            field:aio_context_t ctx_id;       offset:16; size:8; signed:0;
            field:long min_nr;                offset:24; size:8; signed:0;
            field:long nr;                    offset:32; size:8; signed:0;
            field:struct io_event * events;   offset:40; size:8; signed:0;
            field:struct timespec * timeout;  offset:48; size:8; signed:0;

            print fmt: "ctx_id: 0x%08lx, min_nr: 0x%08lx, nr: 0x%08lx,
                        events: 0x%08lx, timeout: 0x%08lx", ((unsigned long)(REC->ctx_id)),
                        ((unsigned long)(REC->min_nr)), ((unsigned long)(REC->nr)),
                        ((unsigned long)(REC->events)), ((unsigned long)(REC->timeout))

As above 'int nr;' and 'long nr;' variables have
duplicated name so problems are occurred in perf-script i.e.

    # perf record -e syscalls:*
    # perf script -g python
    # perf script -s perf-script.py
      File "perf-script.py", line 8694
        def syscalls__sys_enter_io_getevents(event_name, context, common_cpu,
    SyntaxError: duplicate argument 'nr' in function definition
    Error running python script perf-script.py

As above, problems about duplicated argument occurred.
Not only sys_enter_io_getevent() but also sys_enter_io_submit()
have relevevance to this problem.

So rename a variable 'nr' to '__syscall_nr' for system call number
in print_syscall_enter() and etc.

Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Lai Jiangshan <jiangshanlai@xxxxxxxxx>
Signed-off-by: Taeung Song <treeze.taeung@xxxxxxxxx>
---
 kernel/trace/trace.h          |  4 ++--
 kernel/trace/trace_syscalls.c | 16 ++++++++--------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 8414fa4..98b3c66 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -88,13 +88,13 @@ enum trace_type {
  */
 struct syscall_trace_enter {
 	struct trace_entry	ent;
-	int			nr;
+	int			__syscall_nr;
 	unsigned long		args[];
 };
 
 struct syscall_trace_exit {
 	struct trace_entry	ent;
-	int			nr;
+	int			__syscall_nr;
 	long			ret;
 };
 
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 0655afb..90bb468 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -118,7 +118,7 @@ print_syscall_enter(struct trace_iterator *iter, int flags,
 	int i, syscall;
 
 	trace = (typeof(trace))ent;
-	syscall = trace->nr;
+	syscall = trace->__syscall_nr;
 	entry = syscall_nr_to_meta(syscall);
 
 	if (!entry)
@@ -164,7 +164,7 @@ print_syscall_exit(struct trace_iterator *iter, int flags,
 	struct syscall_metadata *entry;
 
 	trace = (typeof(trace))ent;
-	syscall = trace->nr;
+	syscall = trace->__syscall_nr;
 	entry = syscall_nr_to_meta(syscall);
 
 	if (!entry) {
@@ -261,7 +261,7 @@ static int __init syscall_enter_define_fields(struct trace_event_call *call)
 	int i;
 	int offset = offsetof(typeof(trace), args);
 
-	ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER);
+	ret = trace_define_field(call, SYSCALL_FIELD(int, __syscall_nr), FILTER_OTHER);
 	if (ret)
 		return ret;
 
@@ -281,7 +281,7 @@ static int __init syscall_exit_define_fields(struct trace_event_call *call)
 	struct syscall_trace_exit trace;
 	int ret;
 
-	ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER);
+	ret = trace_define_field(call, SYSCALL_FIELD(int, __syscall_nr), FILTER_OTHER);
 	if (ret)
 		return ret;
 
@@ -332,7 +332,7 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
 		return;
 
 	entry = ring_buffer_event_data(event);
-	entry->nr = syscall_nr;
+	entry->__syscall_nr = syscall_nr;
 	syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args);
 
 	event_trigger_unlock_commit(trace_file, buffer, event, entry,
@@ -378,7 +378,7 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
 		return;
 
 	entry = ring_buffer_event_data(event);
-	entry->nr = syscall_nr;
+	entry->__syscall_nr = syscall_nr;
 	entry->ret = syscall_get_return_value(current, regs);
 
 	event_trigger_unlock_commit(trace_file, buffer, event, entry,
@@ -579,7 +579,7 @@ static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id)
 	if (!rec)
 		return;
 
-	rec->nr = syscall_nr;
+	rec->__syscall_nr = syscall_nr;
 	syscall_get_arguments(current, regs, 0, sys_data->nb_args,
 			       (unsigned long *)&rec->args);
 	perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head, NULL);
@@ -652,7 +652,7 @@ static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
 	if (!rec)
 		return;
 
-	rec->nr = syscall_nr;
+	rec->__syscall_nr = syscall_nr;
 	rec->ret = syscall_get_return_value(current, regs);
 	perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head, NULL);
 }
-- 
2.5.0