From: Rik van Riel <riel@surriel.com>
To: Baolin Wang <baolin.wang@linux.alibaba.com>,
akpm@linux-foundation.org, david@kernel.org
Cc: catalin.marinas@arm.com, will@kernel.org,
lorenzo.stoakes@oracle.com, ryan.roberts@arm.com,
Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org,
surenb@google.com, mhocko@suse.com, harry.yoo@oracle.com,
jannh@google.com, willy@infradead.org, baohua@kernel.org,
dev.jain@arm.com, axelrasmussen@google.com, yuanchu@google.com,
weixugc@google.com, hannes@cmpxchg.org,
zhengqi.arch@bytedance.com, shakeel.butt@linux.dev,
linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/5] mm: rmap: add a ZONE_DEVICE folio warning in folio_referenced()
Date: Mon, 23 Feb 2026 21:38:57 -0500 [thread overview]
Message-ID: <b3c1c739c233ccb32945ccaffdaf25fd3f96dd59.camel@surriel.com> (raw)
In-Reply-To: <e91eaa86a6fbb0682b4e308082048c688a57c035.1771897150.git.baolin.wang@linux.alibaba.com>
On Tue, 2026-02-24 at 09:56 +0800, Baolin Wang wrote:
>
> diff --git a/mm/rmap.c b/mm/rmap.c
> index bff8f222004e..be785dfc9336 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -1065,6 +1065,7 @@ int folio_referenced(struct folio *folio, int
> is_locked,
> .invalid_vma = invalid_folio_referenced_vma,
> };
>
> + VM_WARN_ON_FOLIO(folio_is_zone_device(folio), folio);
> *vm_flags = 0;
> if (!pra.mapcount)
> return 0;
Should be a VM_WARN_ON_ONCE_FOLIO so we do not cause
a softlockup if we try to print information about a
million ZONE_DEVICE pages?
--
All Rights Reversed.
next prev parent reply other threads:[~2026-02-24 2:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-24 1:56 [PATCH 0/5] support batched checking of the young flag for MGLRU Baolin Wang
2026-02-24 1:56 ` [PATCH 1/5] mm: use inline helper functions instead of ugly macros Baolin Wang
2026-02-24 2:36 ` Rik van Riel
2026-02-24 1:56 ` [PATCH 2/5] mm: rmap: add a ZONE_DEVICE folio warning in folio_referenced() Baolin Wang
2026-02-24 2:38 ` Rik van Riel [this message]
2026-02-24 1:56 ` [PATCH 3/5] mm: add a batched helper to clear the young flag for large folios Baolin Wang
2026-02-24 1:56 ` [PATCH 4/5] mm: support batched checking of the young flag for MGLRU Baolin Wang
2026-02-24 1:56 ` [PATCH 5/5] arm64: mm: implement the architecture-specific test_and_clear_young_ptes() Baolin Wang
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