From: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx> --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>