diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2014-10-09 15:25:30 -0700 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-09-28 15:15:08 +0200 |
| commit | d814a0896cd70721ccb2c372f831c2eaf4847f51 (patch) | |
| tree | 86d9da9fbec9c7a2e7d0a3b856f3edd743813520 /fs/proc | |
| parent | 1f7fa45d1261dc38b4bd64fb54bf666a60ab52d7 (diff) | |
fs/proc/task_mmu.c: cleanup the "tail_vma" horror in m_next()
1. Kill the first "vma != NULL" check. Firstly this is not possible,
m_next() won't be called if ->start() or the previous ->next()
returns NULL.
And if it was possible the 2nd "vma != tail_vma" check is buggy,
we should not wrongly return ->tail_vma.
2. Make this function readable. The logic is very simple, we should
return check "vma != tail" once and return "vm_next || tail_vma".
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: W4TCH0UT <ateekujjawal@gmail.com>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/task_mmu.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index d4d108280..2254f1d3a 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -265,15 +265,13 @@ out: static void *m_next(struct seq_file *m, void *v, loff_t *pos) { struct proc_maps_private *priv = m->private; - struct vm_area_struct *vma = v; struct vm_area_struct *tail_vma = priv->tail_vma; - struct vm_area_struct *next; + struct vm_area_struct *vma = v, *next = NULL; (*pos)++; - if (vma && (vma != tail_vma) && vma->vm_next) - return vma->vm_next; + if (vma != tail_vma) + next = vma->vm_next ?: tail_vma; - next = (vma != tail_vma) ? tail_vma : NULL; if (!next) vma_stop(priv); return next; |