Warn about allocating with an empty nodemask, it would be easier to
understand than oom messages. The check is added in the slow path.
Suggested-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a2214c6..d624ff3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3448,6 +3448,12 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
if (page)
goto got_pg;
+ if (ac->nodemask && nodes_empty(*ac->nodemask)) {
+ pr_warn("nodemask is empty\n");
+ gfp_mask &= ~__GFP_NOWARN;
+ goto nopage;
+ }
+
/*
* For costly allocations, try direct compaction first, as it's likely
* that we have enough base pages and don't need to reclaim. Don't try
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