diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2014-10-09 15:25:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-09 22:25:48 -0400 |
| commit | 23d54837e4f3a44ad4514d5eae8245c2250217ff (patch) | |
| tree | 086ff9b97bd790748e9da7798d6714cd8fca06f6 /fs/proc/task_mmu.c | |
| parent | 59b4bf12d4776c0e4f3fd5c02d942f3a0596da97 (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>
Diffstat (limited to 'fs/proc/task_mmu.c')
| -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 fdbed8370db6..b7e31836a005 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -210,15 +210,13 @@ 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; |