Changes in mtd_virt_concat.c

8541d8f725c673db3bd741947f27974358b2e163 - Merge tag 'mtd/for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux

Sat, 18 Apr 2026 02:57:04 +0200

Merge tag 'mtd/for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linuxPull MTD updates from Miquel Raynal: "MTD changes: - mtdconcat finally makes it in, after several years of being merged and reverted - Baikal SoC support is being removed, so MTD bits are being removed as well - misc cleanups NAND changes: - SunXi driver support for new versions of the Allwinner NAND controller. - DT-binding improvements and cleanups. - A few fixes (Realtek ECC and Winbond SPI NAND), aside with the usual load of misc changes. SPI NOR fixes: - Enable die erase on MT35XU02GCBA. We knew this flash needed this fixup since 7f77c561e227 ("mtd: spi-nor: micron-st: add TODO for fixing mt35xu02gcba") but did not add it due to lack of hardware to test on. - Fix locking on some Winbond w25q series flashes. - Fix Auto Address Increment (AAI) writes on SST that flashes that start on odd address. The write enable latch needs to be set again after the single byte program"* tag 'mtd/for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux: (44 commits) mtd: spinand: winbond: Declare the QE bit on W25NxxJW mtd: spi-nor: micron-st: Enable die erase support for MT35XU02GCBA mtd: spi-nor: winbond: Fix locking support for w25q256jw mtd: spi-nor: sst: Fix write enable before AAI sequence mtd: spi-nor: winbond: Fix locking support for w25q64jvm mtd: spi-nor: winbond: Fix locking support for w25q256jwm dt-bindings: mtd: mxc-nand: add missing compatible string and ref to nand-controller-legacy.yaml dt-bindings: mtd: gpmi-nand: ref to nand-controller-legacy.yaml dt-bindings: mtd: refactor NAND bindings and add nand-controller-legacy.yaml mtd: spinand: winbond: Clarify when to enable the HS bit mtd: rawnand: sunxi: introduce maximize variable user data length mtd: rawnand: sunxi: fix typos in comments mtd: rawnand: sunxi: change error prone variable name mtd: rawnand: sunxi: remove dead code mtd: rawnand: sunxi: make the code more self-explanatory mtd: rawnand: sunxi: replace hard coded value by a define - take2 mtd: rawnand: sunxi: do not count BBM bytes twice mtd: rawnand: sunxi: fix sunxi_nfc_hw_ecc_read_extra_oob mtd: rawnand: sunxi: sunxi_nand_ooblayout_free code clarification mtd: cmdlinepart: use a flexible array member ... List of files: /linux/drivers/mtd/mtd_virt_concat.c

e19eaffc5213fdd6179e849d3032929fae0d8c2c - mtd: concat: replace alloc + calloc with 1 alloc

Thu, 05 Mar 2026 23:44:10 +0100

mtd: concat: replace alloc + calloc with 1 allocA flex array can be used to reduce the allocation to 1.And actually mtdconcat was using the pointer + 1 trick to point to theoverallocated area. Better alternatives exist.Signed-off-by: Rosen Penev Signed-off-by: Miquel Raynal List of files: /linux/drivers/mtd/mtd_virt_concat.c

c685e6e8d88d544e8c4429b06c3e6795cbba32dd - mtd: virt_concat: use single allocation for node

Thu, 05 Mar 2026 23:44:09 +0100

mtd: virt_concat: use single allocation for nodeSimpler to reason about and avoids having to free nodes separately.Also add __counted_by attribute for extra runtime analysis.Signed-off-by: Rosen Penev Signed-off-by: Miquel Raynal List of files: /linux/drivers/mtd/mtd_virt_concat.c

87d8f1285470b3c8367880993113ea604d365e33 - mtd: virt_concat: fix kdoc text

Mon, 09 Mar 2026 22:17:48 +0100

mtd: virt_concat: fix kdoc textThe function name in the kdoc comment is different from the name of thefunction being documented, fix it.Fixes: 43db6366fc2d ("mtd: Add driver for concatenating devices")Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202603041232.fNDHNtUa-lkp@intel.com/Signed-off-by: Luca Ceresoli Signed-off-by: Miquel Raynal List of files: /linux/drivers/mtd/mtd_virt_concat.c

43db6366fc2de02050e66389f5628d3fdc9af10a - mtd: Add driver for concatenating devices

Wed, 04 Feb 2026 09:32:18 +0100

mtd: Add driver for concatenating devicesIntroducing CONFIG_MTD_VIRT_CONCAT to separate the legacy flow from the newapproach, where only the concatenated partition is registered as an MTDdevice, while the individual partitions that form it are not registeredindependently, as they are typically not required by the user.CONFIG_MTD_VIRT_CONCAT is a boolean configuration option that depends onCONFIG_MTD_PARTITIONED_MASTER. When enabled, it allows flash nodes to beexposed as individual MTD devices along with the other partitions.The solution focuses on fixed-partitions description only as it depends ondevice boundaries. It supports multiple sets of concatenated devices, eachcomprising two or more partitions. flash@0 { reg = <0>; partitions { compatible = "fixed-partitions"; part0@0 { part-concat-next = <&flash0_part1>; label = "part0_0"; reg = <0x0 0x800000>; }; flash0_part1: part1@800000 { label = "part0_1"; reg = <800000 0x800000>; }; part2@1000000 { part-concat-next = <&flash1_part0>; label = "part0_2"; reg = <0x800000 0x800000>; }; }; }; flash@1 { reg = <1>; partitions { compatible = "fixed-partitions"; flash1_part0: part1@0 { label = "part1_0"; reg = <0x0 0x800000>; }; part1@800000 { label = "part1_1"; reg = <0x800000 0x800000>; }; }; };The partitions that gets created areflash@0part0_0-part0_1-concatflash@1part1_1part0_2-part1_0-concatSuggested-by: Bernhard Frauendienst Suggested-by: Miquel Raynal Signed-off-by: Amit Kumar Mahapatra Signed-off-by: Luca Ceresoli Signed-off-by: Miquel Raynal List of files: /linux/drivers/mtd/mtd_virt_concat.c