linux-kernel - [PATCH 5/5] fs/proc/task_mmu.c: update m->version in the main loop in m

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Date:	Thu, 7 Aug 2014 21:18:02 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	David Howells <dhowells@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Peter Zijlstra <peterz@...radead.org>,
	Sasha Levin <levinsasha928@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] 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@...hat.com>
---
 fs/proc/task_mmu.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 1b897dc..4ec6b72 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -183,11 +183,14 @@ 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;
 
-- 
1.5.5.1

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