linux-kernel - [RFC PATCH v3 7/8] drivers: virtio_mem: use pageblock size as the minimum virtio

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Message-Id: <20220105214756.91065-8-zi.yan@sent.com>
Date:   Wed,  5 Jan 2022 16:47:55 -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>, Zi Yan <ziy@...dia.com>
Subject: [RFC PATCH v3 7/8] 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 | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index a6a78685cfbe..2664dc16d0f9 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -2481,8 +2481,7 @@ static int virtio_mem_init_hotplug(struct virtio_mem *vm)
 	 * - Is required for now for alloc_contig_range() to work reliably -
 	 *   it doesn't properly handle smaller granularity on ZONE_NORMAL.
 	 */
-	sb_size = max_t(uint64_t, MAX_ORDER_NR_PAGES,
-			pageblock_nr_pages) * PAGE_SIZE;
+	sb_size = pageblock_nr_pages * PAGE_SIZE;
 	sb_size = max_t(uint64_t, vm->device_block_size, sb_size);
 
 	if (sb_size < memory_block_size_bytes() && !force_bbm) {
-- 
2.34.1