[PATCH resend 1/2] mm: always use base address when clear gigantic page

[Kefeng Wang <wangkefeng.wang@huawei.com>]

When clear gigantic page, it zeros page from the first subpage to
the last subpage, that is, aligned base address is needed in it,
and we don't need to aligned down the address in the caller as the
real address will be passed to process_huge_page().

Fixes: 78fefd04c123 ("mm: memory: convert clear_huge_page() to folio_zero_user()")
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 fs/hugetlbfs/inode.c | 2 +-
 mm/memory.c          | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index a4441fb77f7c..a5ea006f403e 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -825,7 +825,7 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
 			error = PTR_ERR(folio);
 			goto out;
 		}
-		folio_zero_user(folio, ALIGN_DOWN(addr, hpage_size));
+		folio_zero_user(folio, addr);
 		__folio_mark_uptodate(folio);
 		error = hugetlb_add_to_page_cache(folio, mapping, index);
 		if (unlikely(error)) {
diff --git a/mm/memory.c b/mm/memory.c
index 48e534aa939c..934ab5fff537 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -6802,6 +6802,7 @@ static void clear_gigantic_page(struct folio *folio, unsigned long addr,
 	int i;
 
 	might_sleep();
+	addr = ALIGN_DOWN(addr, folio_size(folio));
 	for (i = 0; i < nr_pages; i++) {
 		cond_resched();
 		clear_user_highpage(folio_page(folio, i), addr + i * PAGE_SIZE);
-- 
2.27.0