linux-kernel - [RFC PATCH 10/15] virtio: virtio_balloon: use PAGES_PER_SECTION instead of MAX_ORDER_NR

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Message-Id: <20210805190253.2795604-11-zi.yan@sent.com>
Date:   Thu,  5 Aug 2021 15:02:48 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org
Cc:     Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Michal Hocko <mhocko@...nel.org>,
        John Hubbard <jhubbard@...dia.com>,
        linux-kernel@...r.kernel.org, Zi Yan <ziy@...dia.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org
Subject: [RFC PATCH 10/15] virtio: virtio_balloon: use PAGES_PER_SECTION instead of MAX_ORDER_NR_PAGES.

From: Zi Yan <ziy@...dia.com>

It keeps the existing behavior when MAX_ORDER grows beyond a section.

Signed-off-by: Zi Yan <ziy@...dia.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: Jason Wang <jasowang@...hat.com>
Cc: virtualization@...ts.linux-foundation.org
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/virtio/virtio_balloon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 47dce91f788c..de8d0355d827 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -36,7 +36,7 @@
 #define VIRTIO_BALLOON_FREE_PAGE_ALLOC_FLAG (__GFP_NORETRY | __GFP_NOWARN | \
 					     __GFP_NOMEMALLOC)
 /* The order of free page blocks to report to host */
-#define VIRTIO_BALLOON_HINT_BLOCK_ORDER (MAX_ORDER - 1)
+#define VIRTIO_BALLOON_HINT_BLOCK_ORDER (PFN_SECTION_SHIFT - 1)
 /* The size of a free page block in bytes */
 #define VIRTIO_BALLOON_HINT_BLOCK_BYTES \
 	(1 << (VIRTIO_BALLOON_HINT_BLOCK_ORDER + PAGE_SHIFT))
-- 
2.30.2