From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.207 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793851686; b=kmMNyY6frVawAVh7VTuimKU6Eq+c5fdu0KwhOy3bPHmly9R+oxN4mQm/cOiCJeSWo5xY 8jHiCuWx8nE441tgG3xLNwza0bDQOmqrNivbvvxGStkaSmSp2a+5h9dZJ/XLkYunkP75n f+rHieIjhdn35Mrr4vsYLighWOMZ2wYlNLp6O3+BQSA2NuSGoWa8hBNlJSSEn5ae7nd7X xfY5dskXh4a66LtvhWgGfRS5pCAuZ5tcIkyfKQnwsb0ek1tQcJT/gPlzpVRhRDftG8N+g /y2OFqa/Q2Xmnk7jza2SmjZpNZ76BEYHX3YZtMs2WzxlaJ+Irzvo34ulhODfkEoY7zg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793851686; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:To:Cc:Subject:Date:Message-ID: X-Mailer:MIME-Version:Content-Transfer-Encoding; bh=NDjRE08wBO6pV06Ou8hAMmC9xnZwvIAddVeS9T1njfA=; b=uP+bShLXIBarKwDgjpbBSELoId/GpbDsw4HdmPsPpDUIsXjJNYB9T3n8NQVv0wyF4cvR xljkceBsEd8rn4jQOsiRTkU6VTpw7PDmYbthe8vUnB434tN+8OE/aDyyZBnJfNvEUfV+e eYjwWYdZvh3/jffKfBhk+wxUvpSdv3N1NoFHws7LZVXmF20WTbtkAkDz5su4tSCOXWikM R3IeBu+/JHzYHe92AYsUsPXeQ4sEK8KfbIisY6xeRakRPTY/PbU+4pC1zurIQJJZj9lOm /aYVcnf4BqttBj0ddkUyts/uekP0ksuPITvLnKzuq3qaQfZ3YcRpKDGsfhbz2nPIrww== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=h6bzdrvm; arc=none smtp.remote-ip=95.215.58.207 Received: from mta1.migadu.com (out-207.mta1.migadu.com [95.215.58.207]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F16F2606A31B for ; Thu, 5 Nov 2026 04:08:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org F16F2606A31B Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=h6bzdrvm X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=Dpp0QW6dxtIsgsNrKwbD1Rm5WJVVVno7NqsqAW1y3b8=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793851681; v=1; x=1794456481; b=h6bzdrvm/Ur0kv8vbffG2xS34Jim0MONoZAaiSfCMoP9t+dVQz4zUTEF54fwZ78dSJvhBncK QIdn7FAGic2YhO2wZaXxdhx3ZqbPK0+wERxy7YPaxfOCfKjXiNeWsBIymcoOe4RTuTBlMSzNUrj TTs6TD25LbuPBJmaBEcVVKBw= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id aab9737a8e26880c; Thu, 05 Nov 2026 04:08:01 +0000 X-Mizu-Trace-ID: aab9737a8e26880c X-Migadu-Flow: FLOW_OUT From: Qi Zheng To: muchun.song@linux.dev, osalvador@suse.de, david@kernel.org, akpm@linux-foundation.org, azpijr@gmail.com, lance.yang@linux.dev Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Qi Zheng Subject: [PATCH v2 0/4] mm: hugetlb: fix CMA-related issues Date: Thu, 5 Nov 2026 12:07:42 +0800 Message-ID: X-Mailer: git-send-email 2.48.1 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 Content-Transfer-Encoding: 8bit From: Qi Zheng Hi all, This series fixes four CMA-related issues in HugeTLB reservation, long-term pinning and allocation: - Avoid ineffective CMA reservations on 32-bit x86 kernels running on CPUs that advertise 1 GiB page support. - Allow long-term pins of explicitly CMA-allocated HugeTLB folios, which already own their CMA bitmap ranges. - Preserve the caller's GFP mask when allocating from CMA. - Enforce cpuset restrictions on gigantic surplus allocations while preserving memory policy semantics. Changes in v2: - Replace the PF_MEMALLOC_PIN allocation restriction with a GUP exception for HugeTLB folios marked HPG_cma. (suggested by Muchun Song) - Pass the caller's GFP mask through cma_alloc_frozen_compound() instead of skipping CMA when direct reclaim is disallowed. (suggested by sashiko) - Remove unnecessary revalidation of successfully allocated folios after cpuset changes. Retry only failed allocations. (pointed by Jose A. Perez de Azpillaga) - collect Reviewed-by and Acked-by. - Rebase onto next-20261104. Qi Zheng (4): x86: hugetlb: disable default CMA reservations on 32-bit kernel mm: gup: allow long-term pins of CMA-allocated HugeTLB folios mm: hugetlb: fix GFP mask propagation to CMA mm: hugetlb: fix cpuset violations in gigantic surplus allocations arch/x86/mm/hugetlbpage.c | 2 +- include/linux/cma.h | 2 +- include/linux/mm.h | 29 +---------------------------- mm/cma.c | 4 ++-- mm/gup.c | 31 +++++++++++++++++++++++++++++++ mm/hugetlb.c | 25 ++++++++++++++++++------- mm/hugetlb_cma.c | 4 ++-- 7 files changed, 56 insertions(+), 41 deletions(-) base-commit: 8b7179210b22f8e48a82c5ceacb9d56a9c4cfec4 -- 2.54.0