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From:   Haiyue Wang <haiyue.wang@intel.com>
To:     linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc:     akpm@linux-foundation.org, david@redhat.com, apopple@nvidia.com,
        linmiaohe@huawei.com, ying.huang@intel.com,
        songmuchun@bytedance.com, naoya.horiguchi@linux.dev,
        alex.sierra@amd.com, mike.kravetz@oracle.com,
        gerald.schaefer@linux.ibm.com, Haiyue Wang <haiyue.wang@intel.com>
Subject: [PATCH v7 0/2] fix follow_page related issues
Date:   Tue, 23 Aug 2022 21:58:39 +0800
Message-Id: <20220823135841.934465-1-haiyue.wang@intel.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

v7: Drop the zone device page check for transparent page.

v6: Simplify the multiple layers of conditionals for if {}

-               if (page) {
-                       err = !is_zone_device_page(page) ? page_to_nid(page)
-                                                        : -ENOENT;
-                       if (foll_flags & FOLL_GET)
-                               put_page(page);
-               } else {
-                       err = -ENOENT;
-               }
+               err = -ENOENT;
+               if (!page)
+                       goto set_status;
+
+               if (!is_zone_device_page(page))
+                       err = page_to_nid(page);
+
+               if (foll_flags & FOLL_GET)
+                       put_page(page);

v5: reword the commit message for FOLL_GET with more information.

v4: add '()' for the function for readability.
    add more words about the Non-LRU pages fix in commit message.

v3: Merge the fix for handling Non-LRU pages into one patch.
    Drop the break_ksm zone device page check.

v2: Add the Non-LRU pages fix with two patches, so that
    'mm: migration: fix the FOLL_GET' can be applied directly
    on linux-5.19 stable branch.

Haiyue Wang (2):
  mm: migration: fix the FOLL_GET failure on following huge page
  mm: fix the handling Non-LRU pages returned by follow_page

 mm/huge_memory.c |  2 +-
 mm/ksm.c         | 12 +++++++++---
 mm/migrate.c     | 23 +++++++++++++++++------
 3 files changed, 27 insertions(+), 10 deletions(-)

-- 
2.37.2