linux-kernel - Re: [PATCH v2 3/3] mm/memory-failure: simplify __page_handle

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Message-ID: <aUnCUNjiBOp05kVD@casper.infradead.org>
Date: Mon, 22 Dec 2025 22:12:32 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Jiaqi Yan <jiaqiyan@...gle.com>
Cc: jackmanb@...gle.com, hannes@...xchg.org, linmiaohe@...wei.com,
	ziy@...dia.com, harry.yoo@...cle.com, nao.horiguchi@...il.com,
	david@...hat.com, lorenzo.stoakes@...cle.com,
	william.roche@...cle.com, tony.luck@...el.com,
	wangkefeng.wang@...wei.com, jane.chu@...cle.com,
	akpm@...ux-foundation.org, osalvador@...e.de, muchun.song@...ux.dev,
	rientjes@...gle.com, duenwen@...gle.com, jthoughton@...gle.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Liam.Howlett@...cle.com, vbabka@...e.cz, rppt@...nel.org,
	surenb@...gle.com, mhocko@...e.com
Subject: Re: [PATCH v2 3/3] mm/memory-failure: simplify __page_handle_poison

On Fri, Dec 19, 2025 at 06:33:46PM +0000, Jiaqi Yan wrote:
> Now that no HWPoison page will be given away to buddy allocator
> at the end of dissolve_free_hugetlb_folio, there is no need to
> drain_all_pages and take_page_off_buddy anymore, so remove them.

What if we discover a hardware error in a page which is currently
in the buddy system?  Why don't we need to remove that page from the
buddy system?