linux-kernel - Re: [PATCH] mm,hwpoison: unmap poisoned page before invalidation

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Message-ID: <YkNaVxe5Vso9DGl+@localhost.localdomain>
Date:   Tue, 29 Mar 2022 21:13:27 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     Rik van Riel <riel@...riel.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernel-team@...com, Miaohe Lin <linmiaohe@...wei.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH] mm,hwpoison: unmap poisoned page before invalidation

On Tue, Mar 29, 2022 at 11:49:53AM -0400, Rik van Riel wrote:

> It results in us returning to userspace as if the page
> fault had been handled, resulting in a second fault on
> the same address.
> 
> However, now the page is no longer in the page cache,
> and we can read it in from disk, to a page that is not
> hardware poisoned, and we can then use that second page
> without issues.

Ok, I see, thanks a lot for the explanation Rik.


-- 
Oscar Salvador
SUSE Labs