mm/migration: use helper function vma_lookup() in add_page_for_migration

We could use helper function vma_lookup() to lookup the needed vma to
simplify the code.

Link: https://lkml.kernel.org/r/20220318111709.60311-6-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/migrate.c b/mm/migrate.c
index a993053..e73e1bf 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1604,8 +1604,8 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
 
        mmap_read_lock(mm);
        err = -EFAULT;
-       vma = find_vma(mm, addr);
-       if (!vma || addr < vma->vm_start || !vma_migratable(vma))
+       vma = vma_lookup(mm, addr);
+       if (!vma || !vma_migratable(vma))
                goto out;
 
        /* FOLL_DUMP to ignore special (like zero) pages */