mm: remove unneeded local variable follflags

We can pass FOLL_GET | FOLL_DUMP to follow_page directly to simplify the
code a bit in add_page_for_migration and split_huge_pages_pid.

Link: https://lkml.kernel.org/r/20220311072002.35575-1-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/huge_memory.c

@@ -2953,7 +2953,6 @@ static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
 	 */
 	for (addr = vaddr_start; addr < vaddr_end; addr += PAGE_SIZE) {
 		struct vm_area_struct *vma = find_vma(mm, addr);
-		unsigned int follflags;
 		struct page *page;
 
 		if (!vma || addr < vma->vm_start)
@@ -2966,8 +2965,7 @@ static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
 		}
 
 		/* FOLL_DUMP to ignore special (like zero) pages */
-		follflags = FOLL_GET | FOLL_DUMP;
-		page = follow_page(vma, addr, follflags);
+		page = follow_page(vma, addr, FOLL_GET | FOLL_DUMP);
 
 		if (IS_ERR(page))
 			continue;

mm/migrate.c

@@ -1611,7 +1611,6 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
 {
 	struct vm_area_struct *vma;
 	struct page *page;
-	unsigned int follflags;
 	int err;
 
 	mmap_read_lock(mm);
@@ -1621,8 +1620,7 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
 		goto out;
 
 	/* FOLL_DUMP to ignore special (like zero) pages */
-	follflags = FOLL_GET | FOLL_DUMP;
-	page = follow_page(vma, addr, follflags);
+	page = follow_page(vma, addr, FOLL_GET | FOLL_DUMP);
 
 	err = PTR_ERR(page);
 	if (IS_ERR(page))