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-rw-r--r--mm/sparse.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/sparse.c b/mm/sparse.c
index 3abc8cc50201..691544a2814c 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -740,6 +740,15 @@ static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
if (!memmap)
return;
+ /*
+ * A further optimization is to have per section refcounted
+ * num_poisoned_pages. But that would need more space per memmap, so
+ * for now just do a quick global check to speed up this routine in the
+ * absence of bad pages.
+ */
+ if (atomic_long_read(&num_poisoned_pages) == 0)
+ return;
+
for (i = 0; i < nr_pages; i++) {
if (PageHWPoison(&memmap[i])) {
atomic_long_sub(1, &num_poisoned_pages);