From: Peter Xu <peterx@redhat.com>
To: Miaohe Lin <linmiaohe@huawei.com>
Cc: akpm@linux-foundation.org, willy@infradead.org, vbabka@suse.cz,
dhowells@redhat.com, neilb@suse.de, david@redhat.com,
apopple@nvidia.com, surenb@google.com, minchan@kernel.org,
sfr@canb.auug.org.au, rcampbell@nvidia.com,
naoya.horiguchi@nec.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] mm/swapfile: unuse_pte can map random data if swap read fails
Date: Wed, 20 Apr 2022 09:32:38 -0400 [thread overview]
Message-ID: <YmALdt9MV2MI9FRp@xz-m1.local> (raw)
In-Reply-To: <8e01e276-c956-2486-c55f-c689f33a9106@huawei.com>
On Wed, Apr 20, 2022 at 02:21:27PM +0800, Miaohe Lin wrote:
> On 2022/4/20 5:36, Peter Xu wrote:
> > On Sat, Apr 16, 2022 at 11:05:49AM +0800, Miaohe Lin wrote:
> >> @@ -1797,6 +1797,17 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
> >> goto out;
> >> }
> >>
> >> + if (unlikely(!PageUptodate(page))) {
> >> + pte_t pteval;
> >> +
> >> + dec_mm_counter(vma->vm_mm, MM_SWAPENTS);
> >> + pteval = swp_entry_to_pte(make_swapin_error_entry(page));
> >> + set_pte_at(vma->vm_mm, addr, pte, pteval);
> >> + swap_free(entry);
> >> + ret = 0;
> >> + goto out;
> >> + }
> >> +
> >> /* See do_swap_page() */
> >> BUG_ON(!PageAnon(page) && PageMappedToDisk(page));
> >> BUG_ON(PageAnon(page) && PageAnonExclusive(page));
> >
> > Totally off-topic, but.. today when I was looking at the unuse path I just
> > found that the swp bits could have got lost for either soft-dirty and
> > uffd-wp here? A quick patch attached.
>
> Am I supposed to test-and-send this patch? The patch looks good to me except the
> build error pointed out by kernel test robot.
I was planning to post a patch after yours since they're touching the same
function, but yeah it'll be great if you could also take that over, thanks!
--
Peter Xu
next prev parent reply other threads:[~2022-04-20 13:32 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-16 3:05 [PATCH v2] mm/swapfile: unuse_pte can map random data if swap read fails Miaohe Lin
2022-04-19 3:51 ` Alistair Popple
2022-04-19 7:29 ` Miaohe Lin
2022-04-19 7:39 ` David Hildenbrand
2022-04-19 8:08 ` Alistair Popple
2022-04-19 11:14 ` David Hildenbrand
2022-04-19 16:16 ` Peter Xu
2022-04-19 11:14 ` Miaohe Lin
2022-04-19 7:53 ` Alistair Popple
2022-04-19 11:26 ` Miaohe Lin
2022-04-20 0:25 ` Alistair Popple
2022-04-20 6:15 ` Miaohe Lin
2022-04-20 7:07 ` David Hildenbrand
2022-04-20 8:37 ` Miaohe Lin
2022-04-19 7:37 ` David Hildenbrand
2022-04-19 11:21 ` Miaohe Lin
2022-04-19 11:46 ` David Hildenbrand
2022-04-19 12:00 ` Miaohe Lin
2022-04-19 12:12 ` David Hildenbrand
2022-04-19 12:45 ` Miaohe Lin
2022-04-19 21:36 ` Peter Xu
2022-04-20 5:56 ` [PATCH] mm/swap: Fix lost swap bits in unuse_pte() kernel test robot
2022-04-20 6:23 ` Miaohe Lin
2022-04-20 6:39 ` [kbuild-all] " Philip Li
2022-04-20 6:52 ` Miaohe Lin
2022-04-20 6:48 ` Chen, Rong A
2022-04-20 6:56 ` Miaohe Lin
2022-04-20 6:21 ` [PATCH v2] mm/swapfile: unuse_pte can map random data if swap read fails Miaohe Lin
2022-04-20 13:32 ` Peter Xu [this message]
2022-04-21 1:50 ` Miaohe Lin
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