Linux 5.15 LTS发布，在Arm、RISC-V和MIPS的更新一览

Some of the notable changes for Linux 5.15 include:

• New NTFS file system implementation distributed by Paragon Software with read/write support, that removes the need to use the userspace ntfs-3g implementation for write support. The current implementation supports NTFS file system versions up to 3.1, normal/compressed/sparse files, and journal replaying, with more features coming in the future.
• ksmbd in-kernel SMB 3 server that should deliver optimized performance and better lease handling (distributed caching). It’s NOT meant to fully replace Samba which has a more extensive set of features and tools.
• DAMON (Data Access MONitor) is a lightweight mechanism to monitor the memory access pattern of specific user-space processes. It can tell you which parts of the memory of a process are being accessed all the time, and which ones are not being used. It can be used with damo user-space tool to check your program’s memory behavior. See LWN article for additional information.
• Real-time preemption locking code has been merged – When PREEMPT_RT is enabled, mutex, ww_mutex, rw_semaphore, spinlock and rwlock primitives are now substituted by RT-Mutex based variants.

Arm architecture updates in Linux 5.15

• Allwinner
  • A83t USB OHCI/EHCI documented
• Rockchip
  • PCIe – Rockchip DesignWare PCIe controller driver for RK356X host controller
  • Pinctrl – major refactoring of the Rockchip driver, breaking part of it out to a separate GPIO driver in drivers/gpio
  • Rockchip i/o domain support
  • Handro driver
    • Gained support for H.264 for Rockchip VDPU2 decoder
    • Added support for Rockchip PX30
  • ASoC – Rockchip RK3568 S/PDIF support
  • gpu mali-bifrost – Add RK3568 compatible string for RK3568’s Bifrost Mali-G52 GPU
• Amlogic
  • Added driver for Amlogic Meson IR transmitter (aka IR blaster)
  • PHY driver – Updates for Amlogic Meson8b-usb2 phy
  • ARM device tree changes:
    • meson8: use a default higher default GPU clock to solve probe failure
    • meson: add AIU audio controller and codec for ec100
    • meson8b: fix PWM regulator supply property name
  • ARM config changes – Enable CONFIG_MMC_MESON_MX_SDHC controller used on meson8/8b
• Samsung
  • Pinctrl – Support for Samsung Exynos850 SoC (Exynos3830), minor fix
  • PHY – Updates for Amlogic Meson8b-usb2 phy, Samsung ufs phy
  • DTS ARM changes for Linux 5.15 – Add CPU topology and cache information to Exynos DTSI files.
  • DTS ARM64 changes
    • Add CPU topology and cache information to Exynos DTSI files.
    • Correct GIC CPU interfaces address range on Exynos7.
• Qualcomm
  • Added support for Qualcomm Snapdragon SDM636 and SM8150
  • Pinctrl
    • New subdriver for Qualcomm MDM9607 and SM6115
    • Support for Qualcomm PMC8180, PMC8180C, SA8155p-adp PMIC GPIO
  • PHY
    • UFS PHY for Qualcomm SM6115
    • PCIe & USB/DP PHY for Qualcomm sc8180x
    • USB3 PHY support for Qualcomm IPQ6018
  • IPQ6018 gains USB2 and PCIe
  • IPQ8074 gains SCM, PRNG and Crypto support
  • SC7180 – DisplayPort support
  • ARM64 defconfig update – enabled the MSM8996 CPU clock driver, enabling CPUfreq on the platform.
  • DTS updates for Linux 5.15
    • MSM8974 gains another UART for Bluetooth (on the Sony Xperia Z2 Tablet)
    • Samsung Galaxy S5 gains regulator definitions for audio and modem remoteprocs
    • DSI clocks on APQ8064 are updated as the old legacy clock names are no longer supported by the driver
    • IPQ806x GMAC nodes gains AHB resets wired up.
    • APQ8060 is converted to a SPDX header and the ethernet node is updated in accordance with the binding.
• MediaTek
  • Power management – New cpufreq driver for the MediaTek MT6779 platform called mediatek-hw along with corresponding DT bindings
  • PCIe controller driver – Add MT7629 support in DT
• Other new Arm hardware platforms and SoCs
  • ASpeed – AST2600 BMC implementations for Facebook Cloudripper, Elbert and Fuji server boards.
  • Marvell – CN913x reference boards
  • Microchip – New SAMA7 Cortex-A7 SoC family based on the older SAMA5 series, with the first part being SAMA7G5.
  • NXP
    • i.MX  6 – DHCOM PicoITX, DHSOM DRC0ỉ, SolidRun SolidSense, SKOV i.MX6 boards.
    • i.MX 8/8M – Nitrogen8 SoM and MNT Reform2, LS1088A based Traverse Ten64, Gateworks Venice GW7902 SBC.
  • NVIDIA – Jetson TX2 NX Developer Kit
  • Renesas – R-Car H3e-2G and M3e-2G SoCs
  • ST-Ericsson – ux500 based Samsung phones: Gavini, Codina, and Kyle
  • STMicro – 4KOpen STiH418-b2264 development board
  • Texas Instruments – AM335x based Sancloud BBE Lite

RISC-V Linux 5.15 changelog RISC-V updates listed in Linux 5.15:

• Support PC-relative instructions (auipc and branches) in kprobes
• Support for forced IRQ threading
• Support for the hlt/nohlt kernel command line options, via the generic idle loop
• Show the edge/level triggered behavior of interrupts in /proc/interrupts
• Handful of cleanups to our address mapping mechanisms
• Support for allocating gigantic hugepages via CMA, hugepage migration
• Support for the undefined behavior sanitizer (UBSAN)
• Handful of cleanups to the VDSO that allow the kernel to build with LLD.
• A pair of defconfig additions for NVMe and the EFI filesystem localization options.
• A larger address space for stack randomization.
• A cleanup to our install rules.
• A DTS update for the Microchip Icicle board to fix the serial console.

A couple of MIPS updates Unsurprisingly, MIPS development work has almost come to a halt in Linux 5.15 with very minor changes:

• Converted Pistachio platform to use MIPS generic kernel
• Fixes and cleanups

点击查看更多Linux  5.15 LTS的细节。