diff options
| -rw-r--r-- | mm/hugetlb.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 15fc7b000772..2d7611cf276a 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -104,15 +104,19 @@ 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); + /* + * Copy static prev_nid to local nid, work on that, then copy it + * back to prev_nid afterwards: otherwise there's a window in which + * a racer might pass invalid nid MAX_NUMNODES to alloc_pages_node. + * But we don't need to use a spin_lock here: it really doesn't + * matter if occasionally a racer chooses the same nid as we do. + */ 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); page = alloc_pages_node(nid, htlb_alloc_mask|__GFP_COMP|__GFP_NOWARN, HUGETLB_PAGE_ORDER); |