linux-kernel - [PATCH 5.19 041/101] mm/migrate_device.c: add missing flush_cache

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Message-Id: <20221003070725.488962594@linuxfoundation.org>
Date:   Mon,  3 Oct 2022 09:10:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alistair Popple <apopple@...dia.com>,
        David Hildenbrand <david@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Alex Sierra <alex.sierra@....com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        huang ying <huang.ying.caritas@...il.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Karol Herbst <kherbst@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Lyude Paul <lyude@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Nadav Amit <nadav.amit@...il.com>,
        Paul Mackerras <paulus@...abs.org>,
        Ralph Campbell <rcampbell@...dia.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 5.19 041/101] mm/migrate_device.c: add missing flush_cache_page()

From: Alistair Popple <apopple@...dia.com>

commit a3589e1d5fe39c3d9fdd291b111524b93d08bc32 upstream.

Currently we only call flush_cache_page() for the anon_exclusive case,
however in both cases we clear the pte so should flush the cache.

Link: https://lkml.kernel.org/r/5676f30436ab71d1a587ac73f835ed8bd2113ff5.1662078528.git-series.apopple@nvidia.com
Fixes: 8c3328f1f36a ("mm/migrate: migrate_vma() unmap page from vma while collecting pages")
Signed-off-by: Alistair Popple <apopple@...dia.com>
Reviewed-by: David Hildenbrand <david@...hat.com>
Acked-by: Peter Xu <peterx@...hat.com>
Cc: Alex Sierra <alex.sierra@....com>
Cc: Ben Skeggs <bskeggs@...hat.com>
Cc: Felix Kuehling <Felix.Kuehling@....com>
Cc: huang ying <huang.ying.caritas@...il.com>
Cc: "Huang, Ying" <ying.huang@...el.com>
Cc: Jason Gunthorpe <jgg@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>
Cc: Karol Herbst <kherbst@...hat.com>
Cc: Logan Gunthorpe <logang@...tatee.com>
Cc: Lyude Paul <lyude@...hat.com>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Nadav Amit <nadav.amit@...il.com>
Cc: Paul Mackerras <paulus@...abs.org>
Cc: Ralph Campbell <rcampbell@...dia.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 mm/migrate_device.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -187,9 +187,9 @@ again:
 			bool anon_exclusive;
 			pte_t swp_pte;
 
+			flush_cache_page(vma, addr, pte_pfn(*ptep));
 			anon_exclusive = PageAnon(page) && PageAnonExclusive(page);
 			if (anon_exclusive) {
-				flush_cache_page(vma, addr, pte_pfn(*ptep));
 				ptep_clear_flush(vma, addr, ptep);
 
 				if (page_try_share_anon_rmap(page)) {