linux-kernel - [PATCH v6 5/5] drivers: virtio_mem: use pageblock size as the minimum virtio

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Message-Id: <20220223043037.715205-6-zi.yan@sent.com>
Date:   Tue, 22 Feb 2022 23:30:37 -0500
From:   Zi Yan <zi.yan@...t.com>
To:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        linuxppc-dev@...ts.ozlabs.org,
        virtualization@...ts.linux-foundation.org,
        iommu@...ts.linux-foundation.org, Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Eric Ren <renzhengeek@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Zi Yan <ziy@...dia.com>
Subject: [PATCH v6 5/5] drivers: virtio_mem: use pageblock size as the minimum virtio_mem size.

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

alloc_contig_range() now only needs to be aligned to pageblock_order,
drop virtio_mem size requirement that it needs to be the max of
pageblock_order and MAX_ORDER.

Signed-off-by: Zi Yan <ziy@...dia.com>
---
 drivers/virtio/virtio_mem.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index e7d6b679596d..e07486f01999 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -2476,10 +2476,10 @@ static int virtio_mem_init_hotplug(struct virtio_mem *vm)
 				      VIRTIO_MEM_DEFAULT_OFFLINE_THRESHOLD);
 
 	/*
-	 * TODO: once alloc_contig_range() works reliably with pageblock
-	 * granularity on ZONE_NORMAL, use pageblock_nr_pages instead.
+	 * alloc_contig_range() works reliably with pageblock
+	 * granularity on ZONE_NORMAL, use pageblock_nr_pages.
 	 */
-	sb_size = PAGE_SIZE * MAX_ORDER_NR_PAGES;
+	sb_size = PAGE_SIZE * pageblock_nr_pages;
 	sb_size = max_t(uint64_t, vm->device_block_size, sb_size);
 
 	if (sb_size < memory_block_size_bytes() && !force_bbm) {
-- 
2.34.1