[PATCH] mm: ratelimit PFNs busy info message

[Jonathan Toppins]

The RDMA subsystem can generate several thousand of these messages per
second eventually leading to a kernel crash. Ratelimit these messages
to prevent this crash.

Signed-off-by: Jonathan Toppins <jtoppins@xxxxxxxxxx>
Reviewed-by: Doug Ledford <dledford@xxxxxxxxxx>
Tested-by: Doug Ledford <dledford@xxxxxxxxxx>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6d30e914afb6..07b7d3060b21 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7666,7 +7666,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
 
 	/* Make sure the range is really isolated. */
 	if (test_pages_isolated(outer_start, end, false)) {
-		pr_info("%s: [%lx, %lx) PFNs busy\n",
+		pr_info_ratelimited("%s: [%lx, %lx) PFNs busy\n",
 			__func__, outer_start, end);
 		ret = -EBUSY;
 		goto done;
-- 
2.10.2