[PATCH v2 5/5] mips: use nth_page() in place of direct struct page manipulation.

[Zi Yan <zi.yan@sent.com>]

From: Zi Yan <ziy@nvidia.com>

__flush_dcache_pages() is called during hugetlb migration via
migrate_pages() -> migrate_hugetlbs() -> unmap_and_move_huge_page()
-> move_to_new_folio() -> flush_dcache_folio(). And with hugetlb and
without sparsemem vmemmap, struct page is not guaranteed to be contiguous
beyond a section. Use nth_page() instead.

Fixes: 15fa3e8e3269 ("mips: implement the new page table range API")
Cc: <stable@vger.kernel.org>
Signed-off-by: Zi Yan <ziy@nvidia.com>
---
 arch/mips/mm/cache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index 02042100e267..7f830634dbe7 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -117,7 +117,7 @@ void __flush_dcache_pages(struct page *page, unsigned int nr)
 	 * get faulted into the tlb (and thus flushed) anyways.
 	 */
 	for (i = 0; i < nr; i++) {
-		addr = (unsigned long)kmap_local_page(page + i);
+		addr = (unsigned long)kmap_local_page(nth_page(page, i));
 		flush_data_cache_page(addr);
 		kunmap_local((void *)addr);
 	}
-- 
2.40.1