linux-kernel - Re: [RFC PATCH 1/2] ARM: mm: support memory-failure

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Message-Id: <727caa4f-5be5-4b59-a10e-8dc9bbc384bf@app.fastmail.com>
Date: Mon, 22 Sep 2025 08:37:29 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Xie Yuanbin" <xieyuanbin1@...wei.com>,
 "Russell King" <linux@...linux.org.uk>,
 "Andrew Morton" <akpm@...ux-foundation.org>,
 "David Hildenbrand" <david@...hat.com>,
 "Lorenzo Stoakes" <lorenzo.stoakes@...cle.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 "Vlastimil Babka" <vbabka@...e.cz>, "Mike Rapoport" <rppt@...nel.org>,
 "Suren Baghdasaryan" <surenb@...gle.com>, "Michal Hocko" <mhocko@...e.com>,
 linmiaohe@...wei.com, nao.horiguchi@...il.com,
 "Russell King" <rmk+kernel@...linux.org.uk>,
 "Ard Biesheuvel" <ardb@...nel.org>, "Nathan Chancellor" <nathan@...nel.org>,
 "Eric Biggers" <ebiggers@...nel.org>, "Steven Rostedt" <rostedt@...dmis.org>,
 "Kees Cook" <kees@...nel.org>, "Dave Vasilevsky" <dave@...ilevsky.ca>,
 "Peter Zijlstra" <peterz@...radead.org>
Cc: "Will Deacon" <will@...nel.org>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org, liaohua4@...wei.com,
 lilinjie8@...wei.com
Subject: Re: [RFC PATCH 1/2] ARM: mm: support memory-failure

On Mon, Sep 22, 2025, at 04:14, Xie Yuanbin wrote:
> Memory failure provides the ability of soft offline pages,
> which is very useful to handle the memory errors such as CE in ECC.
>
> Although ARM does not have a user interface like
> `/sys/devices/system/memory/soft_offline_page`, memory-failure still
> provides some exported func that can be used by some module ko driver.

It would be helpful to be more specific about what you
want to do with this.

Are you working on a driver that would actually make use of
the exported interface? I see only a very small number of
drivers that call memory_failure(), and none of them are
usable on Arm.

     Arnd