On Tue, 17 Jul 2007 20:49:25 +0100 (BST) Hugh Dickins <[email protected]> wrote:
> --- 2.6.22-git9/mm/hugetlb.c 2007-07-17 20:29:33.000000000 +0100
> +++ linux/mm/hugetlb.c 2007-07-17 20:32:51.000000000 +0100
> @@ -107,15 +107,12 @@ static int alloc_fresh_huge_page(void)
> {
> static int prev_nid;
> struct page *page;
> - static DEFINE_SPINLOCK(nid_lock);
> int nid;
>
> - spin_lock(&nid_lock);
> nid = next_node(prev_nid, node_online_map);
> if (nid == MAX_NUMNODES)
> nid = first_node(node_online_map);
> prev_nid = nid;
> - spin_unlock(&nid_lock);
Given that we've now gone and added deliberate-but-we-hope-benign
races into this code, an elaborate comment which explains and justifies
it all is pretty much obligatory, IMO.
-
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