Re: [PATCH v2] mm: clean up hwpoison page cache page in fault path

[Oscar Salvador]

On Wed, Feb 16, 2022 at 10:13:14AM +0800, Miaohe Lin wrote:
> IIUC, this could not happen when soft-offlining a pagecache page. They're either
> invalidated or migrated away and then we set PageHWPoison.
> I think this may happen on a clean pagecache page when it's isolated. So it's !PageLRU.
> And identify_page_state treats it as me_unknown because it's non reserved, slab, swapcache
> and so on ...(see error_states for details). Or am I miss anything?

But the path you are talking about is when we do have a non-recoverable
error, so memory_failure() path.
AFAIU, Rik talks about pages with corrected errors, and that is
soft_offline().

-- 
Oscar Salvador
SUSE Labs