Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / fs / proc / task_nommu.c

diff --git a/kernel/fs/proc/task_nommu.c b/kernel/fs/proc/task_nommu.c
index e0d64c9..faacb0c 100644 (file)
--- a/kernel/fs/proc/task_nommu.c
+++ b/kernel/fs/proc/task_nommu.c
@@ -123,23 +123,26 @@ unsigned long task_statm(struct mm_struct *mm,
        return size;
 }
 
-static pid_t pid_of_stack(struct proc_maps_private *priv,
-                               struct vm_area_struct *vma, bool is_pid)
+static int is_stack(struct proc_maps_private *priv,
+                   struct vm_area_struct *vma, int is_pid)
 {
-       struct inode *inode = priv->inode;
-       struct task_struct *task;
-       pid_t ret = 0;
-
-       rcu_read_lock();
-       task = pid_task(proc_pid(inode), PIDTYPE_PID);
-       if (task) {
-               task = task_of_stack(task, vma, is_pid);
+       struct mm_struct *mm = vma->vm_mm;
+       int stack = 0;
+
+       if (is_pid) {
+               stack = vma->vm_start <= mm->start_stack &&
+                       vma->vm_end >= mm->start_stack;
+       } else {
+               struct inode *inode = priv->inode;
+               struct task_struct *task;
+
+               rcu_read_lock();
+               task = pid_task(proc_pid(inode), PIDTYPE_PID);
                if (task)
-                       ret = task_pid_nr_ns(task, inode->i_sb->s_fs_info);
+                       stack = vma_is_stack_for_task(vma, task);
+               rcu_read_unlock();
        }
-       rcu_read_unlock();
-
-       return ret;
+       return stack;
 }
 
 /*
@@ -181,21 +184,9 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
        if (file) {
                seq_pad(m, ' ');
                seq_file_path(m, file, "");
-       } else if (mm) {
-               pid_t tid = pid_of_stack(priv, vma, is_pid);
-
-               if (tid != 0) {
-                       seq_pad(m, ' ');
-                       /*
-                        * Thread stack in /proc/PID/task/TID/maps or
-                        * the main process stack.
-                        */
-                       if (!is_pid || (vma->vm_start <= mm->start_stack &&
-                           vma->vm_end >= mm->start_stack))
-                               seq_printf(m, "[stack]");
-                       else
-                               seq_printf(m, "[stack:%d]", tid);
-               }
+       } else if (mm && is_stack(priv, vma, is_pid)) {
+               seq_pad(m, ' ');
+               seq_printf(m, "[stack]");
        }
 
        seq_putc(m, '\n');