mm-hugetlb-change-to-return-bool-for-isolate_hugetlb-fix

shorten locked section, per SeongJae Park

Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/hugetlb.c

@@ -2933,8 +2933,8 @@ static int alloc_and_dissolve_hugetlb_folio(struct hstate *h,
 		 */
 		spin_unlock_irq(&hugetlb_lock);
 		isolated = isolate_hugetlb(old_folio, list);
-		spin_lock_irq(&hugetlb_lock);
 		ret = isolated ? 0 : -EBUSY;
+		spin_lock_irq(&hugetlb_lock);
 		goto free_new;
 	} else if (!folio_test_hugetlb_freed(old_folio)) {
 		/*