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authorZhang Yanfei <zhangyanfei@cn.fujitsu.com>2013-07-08 15:59:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-09 10:33:21 -0700
commitd157a55815ffff48caec311dfb543ce8a79e283e (patch)
tree99d184196fa3c2ceb1fb531f24fc7a09fcf52832
parent20fc02b477c526c6a85f84e3770373778ff2f97e (diff)
downloadop-kernel-dev-d157a55815ffff48caec311dfb543ce8a79e283e.zip
op-kernel-dev-d157a55815ffff48caec311dfb543ce8a79e283e.tar.gz
mm/vmalloc.c: check VM_UNINITIALIZED flag in s_show instead of show_numa_info
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@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/vmalloc.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index af40068..318c500 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2569,11 +2569,6 @@ 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++)
@@ -2602,6 +2597,11 @@ 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);
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