From: Zhang Yanfei Date: Mon, 8 Jul 2013 22:59:59 +0000 (-0700) Subject: mm/vmalloc.c: check VM_UNINITIALIZED flag in s_show instead of show_numa_info X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d157a55815ffff48caec311dfb543ce8a79e283e;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/vmalloc.c b/mm/vmalloc.c index af40068271c4..318c5007f226 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);