linux-kernel - Re: [PATCH v2] mm/swapfile: unuse_pte can map random data if swap read fails

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Date:   Tue, 19 Apr 2022 19:26:43 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Alistair Popple <apopple@...dia.com>
CC:     <akpm@...ux-foundation.org>, <willy@...radead.org>,
        <vbabka@...e.cz>, <dhowells@...hat.com>, <neilb@...e.de>,
        <david@...hat.com>, <surenb@...gle.com>, <minchan@...nel.org>,
        <peterx@...hat.com>, <sfr@...b.auug.org.au>,
        <rcampbell@...dia.com>, <naoya.horiguchi@....com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mm/swapfile: unuse_pte can map random data if swap
 read fails

On 2022/4/19 15:53, Alistair Popple wrote:
> Also in madvise_free_pte_range() you could just remove the swap entry as it's no
> longer needed.
> 

This swap entry will be removed in madvise_dontneed_single_vma().
And in madvise_free_pte_range(), we may need to keep it as same as
hwpoison entry. Or am I supposed to remove it even if hwpoison entry
is reused later?

Thanks!

> Alistair Popple <apopple@...dia.com> writes:
> 
>> Miaohe Lin <linmiaohe@...wei.com> writes:
>>
...