linux-kernel - [PATCH 12/27] mm: refactor the ZONE_DEVICE handling in migrate_vma

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Date:   Thu, 10 Feb 2022 08:28:13 +0100
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>
Cc:     Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Karol Herbst <kherbst@...hat.com>,
        Lyude Paul <lyude@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Alistair Popple <apopple@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        nvdimm@...ts.linux.dev, linux-mm@...ck.org
Subject: [PATCH 12/27] mm: refactor the ZONE_DEVICE handling in migrate_vma_pages

Make the flow a little more clear and prepare for adding a new
ZONE_DEVICE memory type.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 mm/migrate.c | 27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 30ecd7223656c1..746e1230886ddb 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2788,24 +2788,21 @@ void migrate_vma_pages(struct migrate_vma *migrate)
 
 		mapping = page_mapping(page);
 
-		if (is_zone_device_page(newpage)) {
-			if (is_device_private_page(newpage)) {
-				/*
-				 * For now only support private anonymous when
-				 * migrating to un-addressable device memory.
-				 */
-				if (mapping) {
-					migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
-					continue;
-				}
-			} else {
-				/*
-				 * Other types of ZONE_DEVICE page are not
-				 * supported.
-				 */
+		if (is_device_private_page(newpage)) {
+			/*
+			 * For now only support private anonymous when migrating
+			 * to un-addressable device memory.
+			 */
+			if (mapping) {
 				migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
 				continue;
 			}
+		} else if (is_zone_device_page(newpage)) {
+			/*
+			 * Other types of ZONE_DEVICE page are not supported.
+			 */
+			migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
+			continue;
 		}
 
 		r = migrate_page(mapping, newpage, page, MIGRATE_SYNC_NO_COPY);
-- 
2.30.2