linux-kernel - [PATCH RESEND 1/3] tracing/syscalls: Rename variable 'nr' to 'syscall

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Message-Id: <1456413858-13901-1-git-send-email-treeze.taeung@gmail.com>
Date:	Fri, 26 Feb 2016 00:24:18 +0900
From:	Taeung Song <treeze.taeung@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	linux-kernel@...r.kernel.org,
	Taeung Song <treeze.taeung@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Lai Jiangshan <jiangshanlai@...il.com>
Subject: [PATCH RESEND 1/3] tracing/syscalls: Rename variable 'nr' to 'syscall_nr'

There is a problem about duplicated variable name
for system call number and a argument of some
system call. I found this problem when I tested
perf-script with python script as below.

    # 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
when processing sys_enter_io_getevent() and sys_enter_io_submit().
Because the two system calls have a argument 'nr' as below.

    int io_getevents(aio_context_t ctx_id, long min_nr, long nr,
                     struct io_event *events, struct timespec *timeout);

    int io_submit(aio_context_t ctx_id, long nr, struct iocb **iocbpp);

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

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Lai Jiangshan <jiangshanlai@...il.com>
Signed-off-by: Taeung Song <treeze.taeung@...il.com>
---
 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..beddeb1 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..956209f 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