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-rw-r--r--kernel/trace/trace_stack.c34
1 files changed, 12 insertions, 22 deletions
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 0da1cff08d67..0f6facb050a1 100644
--- 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 = {
186}; 186};
187 187
188static void * 188static void *
189t_next(struct seq_file *m, void *v, loff_t *pos) 189__next(struct seq_file *m, loff_t *pos)
190{ 190{
191 long i; 191 long n = *pos - 1;
192 192
193 (*pos)++; 193 if (n >= max_stack_trace.nr_entries || stack_dump_trace[n] == ULONG_MAX)
194
195 if (v == SEQ_START_TOKEN)
196 i = 0;
197 else {
198 i = *(long *)v;
199 i++;
200 }
201
202 if (i >= max_stack_trace.nr_entries ||
203 stack_dump_trace[i] == ULONG_MAX)
204 return NULL; 194 return NULL;
205 195
206 m->private = (void *)i; 196 m->private = (void *)n;
207
208 return &m->private; 197 return &m->private;
209} 198}
210 199
211static void *t_start(struct seq_file *m, loff_t *pos) 200static void *
201t_next(struct seq_file *m, void *v, loff_t *pos)
212{ 202{
213 void *t = SEQ_START_TOKEN; 203 (*pos)++;
214 loff_t l = 0; 204 return __next(m, pos);
205}
215 206
207static void *t_start(struct seq_file *m, loff_t *pos)
208{
216 local_irq_disable(); 209 local_irq_disable();
217 __raw_spin_lock(&max_stack_lock); 210 __raw_spin_lock(&max_stack_lock);
218 211
219 if (*pos == 0) 212 if (*pos == 0)
220 return SEQ_START_TOKEN; 213 return SEQ_START_TOKEN;
221 214
222 for (; t && l < *pos; t = t_next(m, t, &l)) 215 return __next(m, pos);
223 ;
224
225 return t;
226} 216}
227 217
228static void t_stop(struct seq_file *m, void *p) 218static void t_stop(struct seq_file *m, void *p)