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d=samsung.com; s=mail20170921; t=1773414490; bh=ieZsFx6ApTvtzCX6XrisGuhU15p9rYRXxzDN/ZilEbc=; h=From:To:Cc:Subject:Date:References:From; b=kSqUTRdFlhls6LGeB/gW1ePORD385noPahaD89ukVIdsLtkfmMLxMi1hRSBM4a4+s fLmeERysE9XYIVodCKyzifD1u2T5SvBRSOzM43fsVtseGFxrnWB07C+7kojwAFbKOt /zBYM+9w+x09ZcKH02ijpFMVQTAyrDmU+2PMlACI= Received: from eusmtip1.samsung.com (unknown [203.254.199.221]) by eucas1p1.samsung.com (KnoxPortal) with ESMTPA id 20260313150809eucas1p169ab0904a217a04e0601e2ef01854c73~cbxUNE6ka1866218662eucas1p1i; Fri, 13 Mar 2026 15:08:09 +0000 (GMT) Received: from AMDC4653.digital.local (unknown [106.120.51.32]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20260313150808eusmtip1d9210d2958f7bd448b7051b9db3217fc~cbxTpGxpl0299002990eusmtip1w; Fri, 13 Mar 2026 15:08:08 +0000 (GMT) From: Marek Szyprowski To: Saravana Kannan , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux.dev Cc: Marek Szyprowski , Rob Herring , Krzysztof Kozlowski , Oreoluwa Babatunde , Andrew Morton , Robin Murphy Subject: [PATCH 0/7] Refactor reserved memory regions handling code Date: Fri, 13 Mar 2026 16:07:55 +0100 Message-Id: <20260313150802.1121442-1-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CMS-MailID: 20260313150809eucas1p169ab0904a217a04e0601e2ef01854c73 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20260313150809eucas1p169ab0904a217a04e0601e2ef01854c73 X-EPHeader: CA X-CMS-RootMailID: 20260313150809eucas1p169ab0904a217a04e0601e2ef01854c73 References: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: EE3454000D X-Stat-Signature: hktrpbfzenwu8yitsrn6p9hbkh799u6j X-Rspam-User: X-HE-Tag: 1773414492-433715 X-HE-Meta: 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 QsGD/U4n XvdMtZ2HZ6OZOSbAlMY34aniltz7q3ltCiex/vfbuYc5OlQ+/+Pbw/FYEAl6MErXwOBQHCsDGW8raEbkWGZ8Dh+5gAw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, The reserved memory regions handling code was reworked to handle unlimited so called "static" memory nodes in commit 00c9a452a235 ("of: reserved_mem: Add code to dynamically allocate reserved_mem array"). The side effect of this rework was a set of bugs fixed later by commits 0fd17e598333 ("of: reserved_mem: Allow reserved_mem framework detect "cma=" kernel param") and 2c223f7239f3 ("of: reserved_mem: Restructure call site for dma_contiguous_early_fixup()"). As a result, the code in drivers/of/of_reserved_mem.c became a mix of generic code and CMA specific fixups. In this patchset I try to untangle this spaghetti and perform some code cleanup. I hope nothing breaks this time. Best regards Marek Szyprowski, PhD Samsung R&D Institute Poland Patch summary: Marek Szyprowski (7): of: reserved_mem: remove fdt node from the structure of: reserved_mem: use -ENODEV instead of -ENOENT of: reserved_mem: switch to ops based OF_DECLARE() of: reserved_mem: replace CMA quirks by generic methods of: reserved_mem: rearrange code a bit of: reserved_mem: clarify fdt_scan_reserved_mem*() functions of: reserved_mem: rework fdt_init_reserved_mem_node() drivers/memory/tegra/tegra210-emc-table.c | 17 +- drivers/of/fdt.c | 2 +- drivers/of/of_private.h | 2 +- drivers/of/of_reserved_mem.c | 289 ++++++++++++---------- include/linux/cma.h | 10 - include/linux/dma-map-ops.h | 3 - include/linux/of_reserved_mem.h | 18 +- kernel/dma/coherent.c | 19 +- kernel/dma/contiguous.c | 86 +++++-- kernel/dma/swiotlb.c | 18 +- 10 files changed, 256 insertions(+), 208 deletions(-) -- 2.34.1