From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6C648FD3775 for ; Wed, 25 Feb 2026 16:42:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D39866B008A; Wed, 25 Feb 2026 11:41:59 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id CB9596B008C; Wed, 25 Feb 2026 11:41:59 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AF2716B0092; Wed, 25 Feb 2026 11:41:59 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 9DC5C6B008A for ; Wed, 25 Feb 2026 11:41:59 -0500 (EST) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 477471405E6 for ; Wed, 25 Feb 2026 16:41:59 +0000 (UTC) X-FDA: 84483545958.12.270226B Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf02.hostedemail.com (Postfix) with ESMTP id B85BA80002 for ; Wed, 25 Feb 2026 16:41:57 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=n+xg12JP; spf=pass (imf02.hostedemail.com: domain of mripard@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=mripard@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1772037717; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding:in-reply-to: references:dkim-signature; bh=xwOhCvX5hfnB7th9RFNwJ77Zve9wqw3uYjbXiHZmzSM=; b=6hvyO21xIvD8RgN6x3egBL3/T0jPpZWxtHT+bZsSEk9BAcKXIcWYYY0dZsEBHlNflUcNZi Py4cdrocYlUuLaeQeOJwuURHlgxYZglYgrylPiPCqOVDAs5SnMuEDlE3gj1Phk7I7VUn7G hUFQpUDQux89bfX577msdty0gdqEmQw= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=n+xg12JP; spf=pass (imf02.hostedemail.com: domain of mripard@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=mripard@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1772037717; a=rsa-sha256; cv=none; b=gqrrg5HxtPVMLmqCOYhV+Pt9TKCoWiP+8CNtJeTczCsnHA+9boEZ7tEUpYddQReqbbeXFr CK6IN8IeRHmZESnm4QqseDFglDjvHif3rqDYtHuOkDML4ZjqBD2JPX6j3lLzkJyem08d51 hyQclWpk6tqJvPz4Ivt2EkIbCIjaz/0= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 08FC860126; Wed, 25 Feb 2026 16:41:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3297DC116D0; Wed, 25 Feb 2026 16:41:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772037716; bh=RsGWTxEf7XecP10VMIRwvUSVG8Qsr83RzrgZ5IzF8FI=; h=From:Subject:Date:To:Cc:From; b=n+xg12JPezepMjFSTJolxFs8rNtU/+FapKmNzxdb/yaHfCvOEPJ6mOianSuwJ3HB4 jE3Ot5ZU6GHmh11K/S+fwE9WMB6m+Vwp8SokCYu1VmKfKN8aR3eIuhv8R3ybaKjmv0 efD4dDCcFNqnMcb/eORXibFrZdR7YGUy+z9AKrSPdZpzcx+qh+1SLmvXULdYsGx3BT lIFy6l+hpnInUBMIomFEw0v7FdyjjUcLg7GjjG3HE2J2UAvtjb9xdMjipwGGgLNiGh XaNqsaakVso0/STbFhI6IO0+eqrYd7vRP3dHDYicVFqkj7cQOyLOoxk5pNOvFOOtw3 +vMLUKA5T16mg== From: Maxime Ripard Subject: [PATCH 0/7] dma-buf: heaps: Turn heaps into modules Date: Wed, 25 Feb 2026 17:41:48 +0100 Message-Id: <20260225-dma-buf-heaps-as-modules-v1-0-2109225a090d@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAAAAAAAC/x3MywqEMAxA0V+RrA3U+ADnVwYX0aYa8EVDhwHx3 y0uz+LeC0yiisGnuCDKT02PPaMqC5gW3mdB9dlAjjpH1KLfGMcUcBE+DdlwO3xaxbBydTPWMvW BGHJ+Rgn6f9ff4b4fj1bsG2oAAAA= X-Change-ID: 20260225-dma-buf-heaps-as-modules-1034b3ec9f2a To: Sumit Semwal , Benjamin Gaignard , Brian Starkey , John Stultz , "T.J. Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , Marek Szyprowski , Robin Murphy , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-mm@kvack.org, Maxime Ripard X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1658; i=mripard@kernel.org; h=from:subject:message-id; bh=RsGWTxEf7XecP10VMIRwvUSVG8Qsr83RzrgZ5IzF8FI=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDJnz1fxsJSoPiF0/6nFZ8aiH50IR++QHe2acfuV99o3Ur b8ySw/bd0xlYRDmZJAVU2R5IhN2enn74ioH+5U/YOawMoEMYeDiFICJmGxgrK+6GlaicfGcTlM7 j1HSN+2aLWFpC6+58f3Ksl4fWK82++OBaXObyvu/3GDf+lfy4bsblxjrlDyEk+dOmTt1f4tlj+L D544WizcUfH6/eWZLdt9O3qyk3guqU24edFvzLdMucMm8krc+AA== X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-Rspamd-Server: rspam05 X-Rspam-User: X-Rspamd-Queue-Id: B85BA80002 X-Stat-Signature: gf619egtdh7c169gusxbped3rgcfac1q X-HE-Tag: 1772037717-269622 X-HE-Meta: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi, The recent introduction of heaps in the optee driver [1] made possible the creation of heaps as modules. It's generally a good idea if possible, including for the already existing system and CMA heaps. The system one is pretty trivial, the CMA one is a bit more involved, especially since we have a call from kernel/dma/contiguous.c to the CMA heap code. This was solved by turning the logic around and making the CMA heap call into the contiguous DMA code. Let me know what you think, Maxime 1: https://lore.kernel.org/dri-devel/20250911135007.1275833-4-jens.wiklander@linaro.org/ Signed-off-by: Maxime Ripard --- Maxime Ripard (7): dma: contiguous: Turn heap registration logic around mm: cma: Export cma_alloc and cma_release mm: cma: Export cma_get_name mm: cma: Export dma_contiguous_default_area dma-buf: heaps: Export mem_accounting parameter dma-buf: heaps: cma: Turn the heap into a module dma-buf: heaps: system: Turn the heap into a module drivers/dma-buf/dma-heap.c | 1 + drivers/dma-buf/heaps/Kconfig | 4 ++-- drivers/dma-buf/heaps/cma_heap.c | 21 +++++---------------- drivers/dma-buf/heaps/system_heap.c | 5 +++++ include/linux/dma-map-ops.h | 5 +++++ kernel/dma/contiguous.c | 27 +++++++++++++++++++++++++-- mm/cma.c | 3 +++ 7 files changed, 46 insertions(+), 20 deletions(-) --- base-commit: 499a718536dc0e1c1d1b6211847207d58acd9916 change-id: 20260225-dma-buf-heaps-as-modules-1034b3ec9f2a Best regards, -- Maxime Ripard