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Thu, 05 Nov 2026 03:28:07 -0800 (PST) Received: from [192.168.1.22] ([83.231.69.9]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b56f5e59d3sm64368315e9.10.2026.11.05.03.28.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Nov 2026 03:28:06 -0800 (PST) Message-ID: Date: Thu, 5 Nov 2026 12:28:05 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/4] mm: gup: allow long-term pins of CMA-allocated HugeTLB folios To: Qi Zheng , muchun.song@linux.dev, osalvador@suse.de, david@kernel.org, akpm@linux-foundation.org, lance.yang@linux.dev Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Qi Zheng , stable@vger.kernel.org References: <818fb0b4bbb234e4a2bd0552d61634f1a8431616.1793850539.git.zhengqi.arch@bytedance.com> Content-Language: en-US From: "Jose A. Perez de Azpillaga" In-Reply-To: <818fb0b4bbb234e4a2bd0552d61634f1a8431616.1793850539.git.zhengqi.arch@bytedance.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/5/26 5:07 AM, Qi Zheng wrote: > From: Qi Zheng > > 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 > Signed-off-by: Qi Zheng LGTM: Reviewed-by: Jose A. Perez de Azpillaga -- cheers, jose a. p-a