Merge remote-tracking branches 'regulator/fix/anatop', 'regulator/fix/gpio', 'regulat...

[firefly-linux-kernel-4.4.55.git] / kernel / events / ring_buffer.c

diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index c8aa3f75bc4db8ad7a2242aae6406bfd6f86f8c5..182bc30899d5b095d6e317327065eb7f8409795d 100644 (file)
--- 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);