diff options
| -rw-r--r-- | mm/page_alloc.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index ca58bfcdadac..2f6d30db4c94 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6725,8 +6725,12 @@ int alloc_contig_range(unsigned long start, unsigned long end, if (ret) return ret; + /* + * In case of -EBUSY, we'd like to know which page causes problem. + * So, just fall through. We will check it in test_pages_isolated(). + */ ret = __alloc_contig_migrate_range(&cc, start, end); - if (ret) + if (ret && ret != -EBUSY) goto done; /* @@ -6753,12 +6757,25 @@ int alloc_contig_range(unsigned long start, unsigned long end, outer_start = start; while (!PageBuddy(pfn_to_page(outer_start))) { if (++order >= MAX_ORDER) { - ret = -EBUSY; - goto done; + outer_start = start; + break; } outer_start &= ~0UL << order; } + if (outer_start != start) { + order = page_order(pfn_to_page(outer_start)); + + /* + * outer_start page could be small order buddy page and + * it doesn't include start page. Adjust outer_start + * in this case to report failed page properly + * on tracepoint in test_pages_isolated() + */ + if (outer_start + (1UL << order) <= start) + outer_start = start; + } + /* Make sure the range is really isolated. */ if (test_pages_isolated(outer_start, end, false)) { pr_info("%s: [%lx, %lx) PFNs busy\n", |