From 557c2d8a73dc078817ba6949697ceb8c0f3f7362 Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@redhat.com>
Date: Thu, 9 Oct 2014 15:25:43 -0700
Subject: [PATCH] fs/proc/task_mmu.c: update m->version in the main loop in
m_start()
Change the main loop in m_start() to update m->version. Mostly for
consistency, but this can help to avoid the same loop if the very
1st ->show() fails due to seq_overflow().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: 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>
---
fs/proc/task_mmu.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index c7228c2326d1..34d93a1cdeec 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -184,11 +184,14 @@ static void *m_start(struct seq_file *m, loff_t *ppos)
m->version = 0;
if (pos < mm->map_count) {
- for (vma = mm->mmap; pos; pos--)
+ for (vma = mm->mmap; pos; pos--) {
+ m->version = vma->vm_start;
vma = vma->vm_next;
+ }
return vma;
}
+ /* we do not bother to update m->version in this case */
if (pos == mm->map_count && priv->tail_vma)
return priv->tail_vma;
--
2.34.1