From: "Oscar Salvador (SUSE)" <osalvador@kernel.org>
To: Qi Zheng <qi.zheng@linux.dev>
Cc: muchun.song@linux.dev, osalvador@suse.de, david@kernel.org,
akpm@linux-foundation.org, azpijr@gmail.com,
lance.yang@linux.dev, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Qi Zheng <zhengqi.arch@bytedance.com>,
stable@vger.kernel.org
Subject: Re: [PATCH v2 2/4] mm: gup: allow long-term pins of CMA-allocated HugeTLB folios
Date: Thu, 5 Nov 2026 10:33:35 +0100 [thread overview]
Message-ID: <auxNbw83G5v3nvI_@localhost.localdomain> (raw)
In-Reply-To: <818fb0b4bbb234e4a2bd0552d61634f1a8431616.1793850539.git.zhengqi.arch@bytedance.com>
On Thu, Nov 05, 2026 at 12:07:44PM +0800, Qi Zheng wrote:
> From: Qi Zheng <zhengqi.arch@bytedance.com>
>
> Long-term pinning treats explicitly CMA-allocated HugeTLB folios as
> unpinnable, causing unnecessary migration or pinning failures.
>
> These folios already own their CMA bitmap ranges, and memory blocks
> overlapping CMA areas cannot be offlined. Allow HugeTLB folios with
> HPG_cma to be pinned directly, including in ZONE_MOVABLE.
>
> Fixes: cf11e85fc08c ("mm: hugetlb: optionally allocate gigantic hugepages using cma")
> Cc: stable@vger.kernel.org
> Suggested-by: Muchun Song <muchun.song@linux.dev>
> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
With the rewording suggested by Munchun:
Reviewed-by: Oscar Salvador <osalvador@suse.de>
--
Oscar Salvador
SUSE Labs
next prev parent reply other threads:[~2026-11-05 9:33 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-05 4:07 [PATCH v2 0/4] mm: hugetlb: fix CMA-related issues Qi Zheng
2026-11-05 4:07 ` [PATCH v2 1/4] x86: hugetlb: disable default CMA reservations on 32-bit kernel Qi Zheng
2026-11-05 9:29 ` Oscar Salvador (SUSE)
2026-11-05 4:07 ` [PATCH v2 2/4] mm: gup: allow long-term pins of CMA-allocated HugeTLB folios Qi Zheng
2026-11-05 5:13 ` Muchun Song
2026-11-05 9:33 ` Oscar Salvador (SUSE) [this message]
2026-11-05 11:28 ` Jose A. Perez de Azpillaga
2026-11-05 4:07 ` [PATCH v2 3/4] mm: hugetlb: fix GFP mask propagation to CMA Qi Zheng
2026-11-05 5:17 ` Muchun Song
2026-11-05 10:00 ` Oscar Salvador (SUSE)
2026-11-05 11:28 ` Jose A. Perez de Azpillaga
2026-11-05 4:07 ` [PATCH v2 4/4] mm: hugetlb: fix cpuset violations in gigantic surplus allocations Qi Zheng
2026-11-05 5:15 ` sashiko-bot
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