1 files changed, 38 insertions, 0 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index ce7a6da1b6a0..eb7b4654d6aa 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -65,6 +65,7 @@
 #include <linux/mm.h>
 #include <linux/rcupdate.h>
 #include <linux/kallsyms.h>
+#include <linux/stacktrace.h>
 #include <linux/resource.h>
 #include <linux/module.h>
 #include <linux/mount.h>
@@ -337,6 +338,37 @@ static int proc_pid_wchan(struct task_struct *task, char *buffer)
 }
 #endif /* CONFIG_KALLSYMS */
 
+#ifdef CONFIG_STACKTRACE
+
+#define MAX_STACK_TRACE_DEPTH   64
+
+static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
+                          struct pid *pid, struct task_struct *task)
+{
+        struct stack_trace trace;
+        unsigned long *entries;
+        int i;
+
+        entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
+        if (!entries)
+                return -ENOMEM;
+
+        trace.nr_entries        = 0;
+        trace.max_entries       = MAX_STACK_TRACE_DEPTH;
+        trace.entries           = entries;
+        trace.skip              = 0;
+        save_stack_trace_tsk(task, &trace);
+
+        for (i = 0; i < trace.nr_entries; i++) {
+                seq_printf(m, "[<%p>] %pS\n",
+                           (void *)entries[i], (void *)entries[i]);
+        }
+        kfree(entries);
+
+        return 0;
+}
+#endif
+
 #ifdef CONFIG_SCHEDSTATS
 /*
  * Provides /proc/PID/schedstat
@@ -2500,6 +2532,9 @@ static const struct pid_entry tgid_base_stuff[] = {
 #ifdef CONFIG_KALLSYMS
         INF("wchan",      S_IRUGO, proc_pid_wchan),
 #endif
+#ifdef CONFIG_STACKTRACE
+        ONE("stack",      S_IRUSR, proc_pid_stack),
+#endif
 #ifdef CONFIG_SCHEDSTATS
         INF("schedstat",  S_IRUGO, proc_pid_schedstat),
 #endif
@@ -2835,6 +2870,9 @@ static const struct pid_entry tid_base_stuff[] = {
 #ifdef CONFIG_KALLSYMS
         INF("wchan",     S_IRUGO, proc_pid_wchan),
 #endif
+#ifdef CONFIG_STACKTRACE
+        ONE("stack",      S_IRUSR, proc_pid_stack),
+#endif
 #ifdef CONFIG_SCHEDSTATS
         INF("schedstat", S_IRUGO, proc_pid_schedstat),
 #endif