X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=kernel%2Fevents%2Fring_buffer.c;h=182bc30899d5b095d6e317327065eb7f8409795d;hb=16651fc2f30dfe14dcdd59cf0ccb4e1ccdba4dc7;hp=c8aa3f75bc4db8ad7a2242aae6406bfd6f86f8c5;hpb=9551bf292d67e9070409b59685cdb8fc5437ec3a;p=firefly-linux-kernel-4.4.55.git

diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index c8aa3f75bc4d..182bc30899d5 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -437,7 +437,10 @@ static struct page *rb_alloc_aux_page(int node, int order)
 
 	if (page && order) {
 		/*
-		 * Communicate the allocation size to the driver
+		 * Communicate the allocation size to the driver:
+		 * if we managed to secure a high-order allocation,
+		 * set its first page's private to this order;
+		 * !PagePrivate(page) means it's just a normal page.
 		 */
 		split_page(page, order);
 		SetPagePrivate(page);