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Message-Id: <20230913201248.452081-6-zi.yan@sent.com>
Date: Wed, 13 Sep 2023 16:12:48 -0400
From: Zi Yan <zi.yan@...t.com>
To: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
linux-mips@...r.kernel.org
Cc: Zi Yan <ziy@...dia.com>, Andrew Morton <akpm@...ux-foundation.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
David Hildenbrand <david@...hat.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
Muchun Song <muchun.song@...ux.dev>,
"Mike Rapoport (IBM)" <rppt@...nel.org>, stable@...r.kernel.org
Subject: [PATCH v3 5/5] mips: use nth_page() in place of direct struct page manipulation.
From: Zi Yan <ziy@...dia.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@...r.kernel.org>
Signed-off-by: Zi Yan <ziy@...dia.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
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