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Message-ID: <cdca9b14-18fc-8cf2-5139-49a397098380@redhat.com>
Date: Fri, 2 Sep 2022 08:51:35 +0200
From: David Hildenbrand <david@...hat.com>
To: Alistair Popple <apopple@...dia.com>, linux-mm@...ck.org,
akpm@...ux-foundation.org
Cc: Peter Xu <peterx@...hat.com>, Nadav Amit <nadav.amit@...il.com>,
huang ying <huang.ying.caritas@...il.com>,
LKML <linux-kernel@...r.kernel.org>,
"Sierra Guiza, Alejandro (Alex)" <alex.sierra@....com>,
Felix Kuehling <Felix.Kuehling@....com>,
Jason Gunthorpe <jgg@...dia.com>,
John Hubbard <jhubbard@...dia.com>,
Ralph Campbell <rcampbell@...dia.com>,
Matthew Wilcox <willy@...radead.org>,
Karol Herbst <kherbst@...hat.com>,
Lyude Paul <lyude@...hat.com>, Ben Skeggs <bskeggs@...hat.com>,
Logan Gunthorpe <logang@...tatee.com>, paulus@...abs.org,
linuxppc-dev@...ts.ozlabs.org, stable@...r.kernel.org
Subject: Re: [PATCH v4 2/4] mm/migrate_device.c: Add missing
flush_cache_page()
On 02.09.22 02:35, Alistair Popple wrote:
> 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.
>
> Signed-off-by: Alistair Popple <apopple@...dia.com>
> Fixes: 8c3328f1f36a ("mm/migrate: migrate_vma() unmap page from vma while collecting pages")
> Cc: stable@...r.kernel.org
>
> ---
>
> New for v4
> ---
> mm/migrate_device.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/migrate_device.c b/mm/migrate_device.c
> index 6a5ef9f..4cc849c 100644
> --- a/mm/migrate_device.c
> +++ b/mm/migrate_device.c
> @@ -193,9 +193,9 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
> 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)) {
Reviewed-by: David Hildenbrand <david@...hat.com>
--
Thanks,
David / dhildenb
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