Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[safe/jmp/linux-2.6] / kernel / trace / trace_stack.c

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index c750f65..8504ac7 100644 (file)
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -186,43 +186,33 @@ static const struct file_operations stack_max_size_fops = {
 };
 
 static void *
-t_next(struct seq_file *m, void *v, loff_t *pos)
+__next(struct seq_file *m, loff_t *pos)
 {
-       long i;
-
-       (*pos)++;
-
-       if (v == SEQ_START_TOKEN)
-               i = 0;
-       else {
-               i = *(long *)v;
-               i++;
-       }
+       long n = *pos - 1;
 
-       if (i >= max_stack_trace.nr_entries ||
-           stack_dump_trace[i] == ULONG_MAX)
+       if (n >= max_stack_trace.nr_entries || stack_dump_trace[n] == ULONG_MAX)
                return NULL;
 
-       m->private = (void *)i;
-
+       m->private = (void *)n;
        return &m->private;
 }
 
-static void *t_start(struct seq_file *m, loff_t *pos)
+static void *
+t_next(struct seq_file *m, void *v, loff_t *pos)
 {
-       void *t = SEQ_START_TOKEN;
-       loff_t l = 0;
+       (*pos)++;
+       return __next(m, pos);
+}
 
+static void *t_start(struct seq_file *m, loff_t *pos)
+{
        local_irq_disable();
        __raw_spin_lock(&max_stack_lock);
 
        if (*pos == 0)
                return SEQ_START_TOKEN;
 
-       for (; t && l < *pos; t = t_next(m, t, &l))
-               ;
-
-       return t;
+       return __next(m, pos);
 }
 
 static void t_stop(struct seq_file *m, void *p)
@@ -234,15 +224,8 @@ static void t_stop(struct seq_file *m, void *p)
 static int trace_lookup_stack(struct seq_file *m, long i)
 {
        unsigned long addr = stack_dump_trace[i];
-#ifdef CONFIG_KALLSYMS
-       char str[KSYM_SYMBOL_LEN];
 
-       sprint_symbol(str, addr);
-
-       return seq_printf(m, "%s\n", str);
-#else
-       return seq_printf(m, "%p\n", (void*)addr);
-#endif
+       return seq_printf(m, "%pF\n", (void *)addr);
 }
 
 static void print_disabled(struct seq_file *m)
@@ -265,7 +248,7 @@ static int t_show(struct seq_file *m, void *v)
                seq_printf(m, "        Depth    Size   Location"
                           "    (%d entries)\n"
                           "        -----    ----   --------\n",
-                          max_stack_trace.nr_entries);
+                          max_stack_trace.nr_entries - 1);
 
                if (!stack_tracer_enabled && !max_stack_size)
                        print_disabled(m);
@@ -301,35 +284,32 @@ static const struct seq_operations stack_trace_seq_ops = {
 
 static int stack_trace_open(struct inode *inode, struct file *file)
 {
-       int ret;
-
-       ret = seq_open(file, &stack_trace_seq_ops);
-
-       return ret;
+       return seq_open(file, &stack_trace_seq_ops);
 }
 
 static const struct file_operations stack_trace_fops = {
        .open           = stack_trace_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
+       .release        = seq_release,
 };
 
 int
 stack_trace_sysctl(struct ctl_table *table, int write,
-                  struct file *file, void __user *buffer, size_t *lenp,
+                  void __user *buffer, size_t *lenp,
                   loff_t *ppos)
 {
        int ret;
 
        mutex_lock(&stack_sysctl_mutex);
 
-       ret = proc_dointvec(table, write, file, buffer, lenp, ppos);
+       ret = proc_dointvec(table, write, buffer, lenp, ppos);
 
        if (ret || !write ||
-           (last_stack_tracer_enabled == stack_tracer_enabled))
+           (last_stack_tracer_enabled == !!stack_tracer_enabled))
                goto out;
 
-       last_stack_tracer_enabled = stack_tracer_enabled;
+       last_stack_tracer_enabled = !!stack_tracer_enabled;
 
        if (stack_tracer_enabled)
                register_ftrace_function(&trace_ops);
@@ -352,19 +332,14 @@ __setup("stacktrace", enable_stacktrace);
 static __init int stack_trace_init(void)
 {
        struct dentry *d_tracer;
-       struct dentry *entry;
 
        d_tracer = tracing_init_dentry();
 
-       entry = debugfs_create_file("stack_max_size", 0644, d_tracer,
-                                   &max_stack_size, &stack_max_size_fops);
-       if (!entry)
-               pr_warning("Could not create debugfs 'stack_max_size' entry\n");
+       trace_create_file("stack_max_size", 0644, d_tracer,
+                       &max_stack_size, &stack_max_size_fops);
 
-       entry = debugfs_create_file("stack_trace", 0444, d_tracer,
-                                   NULL, &stack_trace_fops);
-       if (!entry)
-               pr_warning("Could not create debugfs 'stack_trace' entry\n");
+       trace_create_file("stack_trace", 0444, d_tracer,
+                       NULL, &stack_trace_fops);
 
        if (stack_tracer_enabled)
                register_ftrace_function(&trace_ops);