tracing/syscalls: various cleanups

Impact: cleanup

- Drop unused cpu variable
- Fix some errors on comments

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1237151439-6755-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/trace/trace_syscalls.c

@@ -7,7 +7,7 @@
 
 static atomic_t refcount;
 
-/* Our two options */
+/* Option to display the parameters types */
 enum {
 	TRACE_SYSCALLS_OPT_TYPES = 0x1,
 };
@@ -18,7 +18,7 @@ static struct tracer_opt syscalls_opts[] = {
 };
 
 static struct tracer_flags syscalls_flags = {
-	.val = 0, /* By default: no args types */
+	.val = 0, /* By default: no parameters types */
 	.opts = syscalls_opts
 };
 
@@ -135,12 +135,9 @@ void ftrace_syscall_enter(struct pt_regs *regs)
 	struct ring_buffer_event *event;
 	int size;
 	int syscall_nr;
-	int cpu;
 
 	syscall_nr = syscall_get_nr(current, regs);
 
-	cpu = raw_smp_processor_id();
-
 	sys_data = syscall_nr_to_meta(syscall_nr);
 	if (!sys_data)
 		return;
@@ -166,12 +163,9 @@ void ftrace_syscall_exit(struct pt_regs *regs)
 	struct syscall_metadata *sys_data;
 	struct ring_buffer_event *event;
 	int syscall_nr;
-	int cpu;
 
 	syscall_nr = syscall_get_nr(current, regs);
 
-	cpu = raw_smp_processor_id();
-
 	sys_data = syscall_nr_to_meta(syscall_nr);
 	if (!sys_data)
 		return;