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Message-ID: <51B2EF06.3070106@gmail.com>
Date: Sat, 08 Jun 2013 16:44:54 +0800
From: Zhang Yanfei <zhangyanfei.yes@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: Joonsoo Kim <iamjoonsoo.kim@....com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Linux MM <linux-mm@...ck.org>
Subject: [PATCH -mm 2/2] mm, vmalloc: Check VM_UNINITIALIZED flag in s_show
instead of show_numa_info
From: Zhang Yanfei <zhangyanfei@...fujitsu.com>
We should check the VM_UNITIALIZED flag in s_show(). If this
flag is set, that said, the vm_struct is not fully initialized.
So it is unnecessary to try to show the information contained
in vm_struct.
We checked this flag in show_numa_info(), but I think it's better
to check it earlier.
Signed-off-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
---
mm/vmalloc.c | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index fe41a4f..722268b 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2591,11 +2591,6 @@ static void show_numa_info(struct seq_file *m, struct vm_struct *v)
if (!counters)
return;
- /* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
- smp_rmb();
- if (v->flags & VM_UNINITIALIZED)
- return;
-
memset(counters, 0, nr_node_ids * sizeof(unsigned int));
for (nr = 0; nr < v->nr_pages; nr++)
@@ -2624,6 +2619,11 @@ static int s_show(struct seq_file *m, void *p)
v = va->vm;
+ /* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
+ smp_rmb();
+ if (v->flags & VM_UNINITIALIZED)
+ return 0;
+
seq_printf(m, "0x%pK-0x%pK %7ld",
v->addr, v->addr + v->size, v->size);
--
1.7.1
--
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