linux-kernel - [PATCH v1 06/12] virtio: virtio_balloon: use pageblock_order instead of MAX

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Message-Id: <20220922011252.2266780-7-zi.yan@sent.com>
Date:   Wed, 21 Sep 2022 21:12:46 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     linux-mm@...ck.org
Cc:     Zi Yan <ziy@...dia.com>, David Hildenbrand <david@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Yang Shi <shy828301@...il.com>,
        David Rientjes <rientjes@...gle.com>,
        James Houghton <jthoughton@...gle.com>,
        Mike Rapoport <rppt@...nel.org>,
        Muchun Song <songmuchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 06/12] virtio: virtio_balloon: use pageblock_order instead of MAX_ORDER

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

virtio_balloon used MAX_ORDER to report free page blocks to host, as
MAX_ORDER becomes modifiable in later commits, the reported free size might
be too big. pageblock_order is either 1/2 of or the same as MAX_ORDER
currently. Use pageblock_order instead to make virtio_balloon have a
constant free page block report size when MAX_ORDER is changed in the later
commits.

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 5b15936a5214..51447737538b 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -33,7 +33,7 @@
 #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
+#define VIRTIO_BALLOON_HINT_BLOCK_ORDER pageblock_order
 /* The size of a free page block in bytes */
 #define VIRTIO_BALLOON_HINT_BLOCK_BYTES \
 	(1 << (VIRTIO_BALLOON_HINT_BLOCK_ORDER + PAGE_SHIFT))
-- 
2.35.1