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mm/vmalloc.c: check VM_UNINITIALIZED flag in s_show instead of show_numa_info

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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>
This commit is contained in:
Zhang Yanfei 2013-07-08 15:59:59 -07:00 committed by Linus Torvalds
parent 20fc02b477
commit d157a55815
1 changed files with 5 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

10
mm/vmalloc.c
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@ -2569,11 +2569,6 @@ static void show_numa_info(struct seq_file *m, struct vm_struct *v)
if (!counters) if (!counters)
return; 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)); memset(counters, 0, nr_node_ids * sizeof(unsigned int));
for (nr = 0; nr < v->nr_pages; nr++) 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; 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", seq_printf(m, "0x%pK-0x%pK %7ld",
v->addr, v->addr + v->size, v->size); v->addr, v->addr + v->size, v->size);