From: David Hildenbrand <david@redhat.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, linux-mm@kvack.org
Cc: akpm@linux-foundation.org, Yang Shi <shy828301@gmail.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [PATCH] mm/migrate: fix NR_ISOLATED corruption on 64-bit
Date: Wed, 28 Jul 2021 10:19:33 +0200 [thread overview]
Message-ID: <671b0c80-9cae-0854-ccbe-1c3e66b20ce2@redhat.com> (raw)
In-Reply-To: <20210728042531.359409-1-aneesh.kumar@linux.ibm.com>
On 28.07.21 06:25, Aneesh Kumar K.V wrote:
> Similar to commit 2da9f6305f30 ("mm/vmscan: fix NR_ISOLATED_FILE corruption on 64-bit")
> avoid using unsigned int for nr_pages. With unsigned int type the large
> unsigned int converts to a large positive signed long.
>
> Symptoms include CMA allocations hanging forever
> due to alloc_contig_range->...->isolate_migratepages_block waiting
> forever in "while (unlikely(too_many_isolated(pgdat)))".
>
> Fixes: c5fc5c3ae0c8 ("mm: migrate: account THP NUMA migration counters correctly")
> Cc: Yang Shi <shy828301@gmail.com>
> Reported-by: Michael Ellerman <mpe@ellerman.id.au>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
> ---
> mm/migrate.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 34a9ad3e0a4f..7e240437e7d9 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -2068,7 +2068,7 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
> LIST_HEAD(migratepages);
> new_page_t *new;
> bool compound;
> - unsigned int nr_pages = thp_nr_pages(page);
> + int nr_pages = thp_nr_pages(page);
>
> /*
> * PTE mapped THP or HugeTLB page can't reach here so the page could
>
Already posted:
https://lkml.kernel.org/r/20210722054840.501423-1-npiggin@gmail.com
but this patch description is a lot better.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-07-28 8:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-28 4:25 [PATCH] mm/migrate: fix NR_ISOLATED corruption on 64-bit Aneesh Kumar K.V
2021-07-28 8:19 ` David Hildenbrand [this message]
2021-07-28 23:44 ` Yang Shi
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