linux-kernel - [PATCH] tracing/syscalls: Fix to print parameter types

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Date:	Mon, 17 Aug 2009 16:55:18 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jason Baron <jbaron@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] tracing/syscalls: Fix to print parameter types

When syscall tracing was implemented as a tracer,  "syscall_arg_type"
trace option could be set to enable the display of syscall parameter
types.

Now this option is gone since it's no longer a tracer, but the code
is still there but dead.

So we remove dead code and re-enable the printing of paramete types
via the verbose option:

  # echo verbose > trace_options
  # echo syscalls > set_event
  # cat trace
	...
        bash-3331  [000]    95.348937: sys_fcntl64 -> 0x1
        bash-3331  [000]    95.348942: sys_close(unsigned int fd: a)
	...

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 kernel/trace/trace_syscalls.c |   17 +----------------
 1 files changed, 1 insertions(+), 16 deletions(-)

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index f837ccc..f130dac 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -13,21 +13,6 @@ static int sys_refcount_exit;
 static DECLARE_BITMAP(enabled_enter_syscalls, FTRACE_SYSCALL_MAX);
 static DECLARE_BITMAP(enabled_exit_syscalls, FTRACE_SYSCALL_MAX);
 
-/* Option to display the parameters types */
-enum {
-	TRACE_SYSCALLS_OPT_TYPES = 0x1,
-};
-
-static struct tracer_opt syscalls_opts[] = {
-	{ TRACER_OPT(syscall_arg_type, TRACE_SYSCALLS_OPT_TYPES) },
-	{ }
-};
-
-static struct tracer_flags syscalls_flags = {
-	.val = 0, /* By default: no parameters types */
-	.opts = syscalls_opts
-};
-
 enum print_line_t
 print_syscall_enter(struct trace_iterator *iter, int flags)
 {
@@ -55,7 +40,7 @@ print_syscall_enter(struct trace_iterator *iter, int flags)
 
 	for (i = 0; i < entry->nb_args; i++) {
 		/* parameter types */
-		if (syscalls_flags.val & TRACE_SYSCALLS_OPT_TYPES) {
+		if (trace_flags & TRACE_ITER_VERBOSE) {
 			ret = trace_seq_printf(s, "%s ", entry->types[i]);
 			if (!ret)
 				return TRACE_TYPE_PARTIAL_LINE;
-- 
1.6.3

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