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-rw-r--r--mm/page_alloc.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d4096f4a5c1f..73f5d4556b3d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2507,10 +2507,6 @@ void drain_all_pages(struct zone *zone)
if (WARN_ON_ONCE(!mm_percpu_wq))
return;
- /* Workqueues cannot recurse */
- if (current->flags & PF_WQ_WORKER)
- return;
-
/*
* Do not drain if one is already in progress unless it's specific to
* a zone. Such callers are primarily CMA and memory hotplug and need
@@ -7656,11 +7652,18 @@ int alloc_contig_range(unsigned long start, unsigned long end,
/*
* 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().
+ * So, just fall through. test_pages_isolated() has a tracepoint
+ * which will report the busy page.
+ *
+ * It is possible that busy pages could become available before
+ * the call to test_pages_isolated, and the range will actually be
+ * allocated. So, if we fall through be sure to clear ret so that
+ * -EBUSY is not accidentally used or returned to caller.
*/
ret = __alloc_contig_migrate_range(&cc, start, end);
if (ret && ret != -EBUSY)
goto done;
+ ret =0;
/*
* Pages from [start, end) are within a MAX_ORDER_NR_PAGES