Changes in Kconfig

31e9fa2b - arm: vdso: Switch to generic storage implementation

Tue, 04 Feb 2025 12:05:43 +0000

arm: vdso: Switch to generic storage implementationThe generic storage implementation provides the same features as thecustom one. However it can be shared between architectures, makingmaintenance easier.Co-developed-by: Nam Cao Signed-off-by: Nam Cao Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-11-13a4669dfc8c@linutronix.de List of files: /linux-6.15/arch/arm/mm/Kconfig

2560cffd - ARM: Delete ARM11MPCore (ARM11 ARMv6K SMP) support

Thu, 07 Dec 2023 13:33:35 +0000

ARM: Delete ARM11MPCore (ARM11 ARMv6K SMP) supportThis ARM11 SMP configuration was one of the first SMP configurationsthe ARM kernel supported, but it has the downside of odd DMA handling,odd cache tagging, and often (as of recent) completely broken cachehandling on the ARM RealView PB11MPCore test chips. To boot theplatform it was necessary to completely disable the cache.When it comes to the EB 11MPCore it is unclear if this ever worked.These reference designs are now the only ARMv6K SMP platforms.As only reference designs of purely academic interest remain, andsince the special-cased DMA and PMU code is hard to maintain anddoesn't really work, it is not really worth our time.Delete the ARM11MPCore support along with:- The special DMA quirk CONFIG_DMA_CACHE_RWFO that is only used on ARMv6K SMP, and we are the last ARMV6K system leaving the building and the cache handling is awkward, so good-bye.- The special PMU handling that was only used by ARM11MPCore.The following is left behind:- TIMER_OF_DECLARE(arm_twd_11mp, "arm,arm11mp-twd-timer", ...) in arch/arm/kernel/smp_twd.c, this is still in use by Marvell MMP3 arch/arm/boot/dts/marvell/mmp3.dtsi- IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", ...) in drivers/irqchip/irq-gic.c, this is still in use by Marvell MMP3 arch/arm/boot/dts/marvell/mmp3.dtsi- A compatible for the arm11mpcore SCU, since this was mistakedly used for the Cortex-A9 version of RealView EB.These are unfortunate but will need to be kept around forcompatibility. New Marvell-specific compatibles should however probablybe added.Acked-by: Mark Rutland Reviewed-by: Arnd Bergmann Signed-off-by: Linus Walleij Acked-by: Liviu Dudau Link: https://lore.kernel.org/r/20231207-drop-11mpcore-v2-1-560b396f3bf5@linaro.orgSigned-off-by: Arnd Bergmann List of files: /linux-6.15/arch/arm/mm/Kconfig

e318b36e - arm: update in-source documentation references

Wed, 03 May 2023 22:50:54 +0000

arm: update in-source documentation referencesThe Arm documentation has moved to Documentation/arch/arm; updatereferences within arch/arm to match.Cc: Russell King Cc: Alim Akhtar Cc: Patrice Chotard Cc: linux-doc@vger.kernel.orgCc: linux-arm-kernel@lists.infradead.orgCc: linux-arch@vger.kernel.orgSigned-off-by: Jonathan Corbet List of files: /linux-6.15/arch/arm/mm/Kconfig

252309ad - ARM: Make CONFIG_CPU_V7 valid for 32bit ARMv8 implementations

Fri, 17 Mar 2023 19:50:25 +0000

ARM: Make CONFIG_CPU_V7 valid for 32bit ARMv8 implementationsARMv8 is a superset of ARMv7, and all the ARMv8 features arediscoverable with a set of ID registers. It means that we canuse CPU_V7 to guard ARMv8 features at compile time.This commit simply amends the CPU_V7 configuration symbol commentto reflect that CPU_V7 also covers ARMv8.Signed-off-by: Marc Zyngier Signed-off-by: Zaid Al-Bassam Tested-by: Florian Fainelli Link: https://lore.kernel.org/r/20230317195027.3746949-7-zalbassam@google.comSigned-off-by: Will Deacon List of files: /linux-6.15/arch/arm/mm/Kconfig

cfb1076d - ARM: 9288/1: Kconfigs: fix spelling & grammar

Tue, 24 Jan 2023 18:16:18 +0000

ARM: 9288/1: Kconfigs: fix spelling & grammarFix spelling (reported by codespell) and grammar in Arm Kconfig files.Signed-off-by: Randy Dunlap Cc: linux-arm-kernel@lists.infradead.orgCc: patches@armlinux.org.ukSigned-off-by: Russell King (Oracle) List of files: /linux-6.15/arch/arm/mm/Kconfig

2bf62042 - ARM: 9212/1: domain: Modify Kconfig help text

Sun, 19 Jun 2022 19:40:16 +0000

ARM: 9212/1: domain: Modify Kconfig help textAfter the removal of set_fs() the reference to set_fs() is stale.Alter the helptext to reflect what the config option really does.Fixes: 8ac6f5d7f84b ("ARM: 9113/1: uaccess: remove set_fs() implementation")Acked-by: Arnd Bergmann Signed-off-by: Linus Walleij Signed-off-by: Russell King (Oracle) List of files: /linux-6.15/arch/arm/mm/Kconfig

5d6f5267 - ARM: rework endianess selection

Mon, 04 Apr 2022 09:52:31 +0000

ARM: rework endianess selectionChoosing big-endian vs little-endian kernels in Kconfig has not workedcorrectly since the introduction of CONFIG_ARCH_MULTIPLATFORM a longtime ago.The problems is that CONFIG_BIG_ENDIAN depends onARCH_SUPPORTS_BIG_ENDIAN, which can set by any one platformin the config, but would actually have to be supported by allof them.This was mostly ok for ARMv6/ARMv7 builds, since these are BE8 andtend to just work aside from problems in nonportable device drivers.For ARMv4/v5 machines, CONFIG_BIG_ENDIAN and CONFIG_ARCH_MULTIPLATFORMwere never set together, so this was disabled on all those machinesexcept for IXP4xx.As IXP4xx can now become part of ARCH_MULTIPLATFORM, it seems better toformalize this logic: all ARMv4/v5 platforms get an explicit dependencyon being either big-endian (ixp4xx) or little-endian (the rest). We maywant to fix ixp4xx in the future to support both, but it does not workin LE mode at the moment.For the ARMv6/v7 platforms, there are two ways this could be handled a) allow both modes only for platforms selecting 'ARCH_SUPPORTS_BIG_ENDIAN' today, but only LE mode for the others, given that these were added intentionally at some point. b) allow both modes everwhere, given that it was already possible to build that way by e.g. selecting ARCH_VIRT, and that the list is not an accurate reflection of which platforms may or may not work.Out of these, I picked b) because it seemed slighly more logicalto me.Signed-off-by: Arnd Bergmann List of files: /linux-6.15/arch/arm/mm/Kconfig

b9baf5c8 - ARM: Spectre-BHB workaround

Thu, 10 Feb 2022 16:05:45 +0000

ARM: Spectre-BHB workaroundWorkaround the Spectre BHB issues for Cortex-A15, Cortex-A57,Cortex-A72, Cortex-A73 and Cortex-A75. We also include Brahma B15 aswell to be safe, which is affected by Spectre V2 in the same ways asCortex-A15.Reviewed-by: Catalin Marinas Signed-off-by: Russell King (Oracle) List of files: /linux-6.15/arch/arm/mm/Kconfig

9dd78194 - ARM: report Spectre v2 status through sysfs

Fri, 11 Feb 2022 16:45:54 +0000

ARM: report Spectre v2 status through sysfsAs per other architectures, add support for reporting the Spectrevulnerability status via sysfs CPU.Acked-by: Catalin Marinas Signed-off-by: Russell King (Oracle) List of files: /linux-6.15/arch/arm/mm/Kconfig

7b9896c3 - ARM: percpu: add SMP_ON_UP support

Thu, 25 Nov 2021 09:26:44 +0000

ARM: percpu: add SMP_ON_UP supportPermit the use of the TPIDRPRW system register for carrying the per-CPUoffset in generic SMP configurations that also target non-SMP capableARMv6 cores. This uses the SMP_ON_UP code patching framework to turn allTPIDRPRW accesses into reads/writes of entry #0 in the __per_cpu_offsetarray.While at it, switch over some existing direct TPIDRPRW accesses in asmcode to invocations of a new helper that is patched in the same way whennecessary.Note that CPU_V6+SMP without SMP_ON_UP results in a kernel that does notboot on v6 CPUs without SMP extensions, so add this dependency toKconfig as well.Acked-by: Linus Walleij Acked-by: Nicolas Pitre Signed-off-by: Ard Biesheuvel Tested-by: Marc Zyngier Tested-by: Vladimir Murzin # ARMv7M List of files: /linux-6.15/arch/arm/mm/Kconfig

8b5bd5ad - ARM: 9137/1: disallow CONFIG_THUMB with ARMv4

Mon, 18 Oct 2021 14:30:07 +0000

ARM: 9137/1: disallow CONFIG_THUMB with ARMv4We can currently build a multi-cpu enabled kernel that allows both ARMv4and ARMv5 CPUs, and also supports THUMB mode in user space.However, returning to user space in this configuration with the usr_retmacro requires the use of the 'bx' instruction, which is refused bythe assembler:arch/arm/kernel/entry-armv.S: Assembler messages:arch/arm/kernel/entry-armv.S:937: Error: selected processor does not support `bx lr' in ARM modearch/arm/kernel/entry-armv.S:960: Error: selected processor does not support `bx lr' in ARM modearch/arm/kernel/entry-armv.S:1003: Error: selected processor does not support `bx lr' in ARM mode:2:2: note: instruction requires: armv4t bx lrWhile it would be possible to handle this correctly in principle, doing soseems to not be worth it, if we can simply avoid the problem by enforcingthat a kernel supporting both ARMv4 and a later CPU architecture cannotrun THUMB binaries.This turned up while build-testing with clang; for some reason,gcc never triggered the problem.Reviewed-by: Nick Desaulniers Reviewed-by: Ard Biesheuvel Signed-off-by: Arnd Bergmann Signed-off-by: Russell King (Oracle) List of files: /linux-6.15/arch/arm/mm/Kconfig

345dac33 - ARM: 9136/1: ARMv7-M uses BE-8, not BE-32

Mon, 18 Oct 2021 14:30:06 +0000

ARM: 9136/1: ARMv7-M uses BE-8, not BE-32When configuring the kernel for big-endian, we set either BE-8 or BE-32based on the CPU architecture level. Until linux-4.4, we did not haveany ARMv7-M platform allowing big-endian builds, but now i.MX/Vybridis in that category, adn we get a build error because of this:arch/arm/kernel/module-plts.c: In function 'get_module_plt':arch/arm/kernel/module-plts.c:60:46: error: implicit declaration of function '__opcode_to_mem_thumb32' [-Werror=implicit-function-declaration]This comes down to picking the wrong default, ARMv7-M uses BE8like ARMv7-A does. Changing the default gets the kernel to compileand presumably works.https://lore.kernel.org/all/1455804123-2526139-2-git-send-email-arnd@arndb.de/Tested-by: Vladimir Murzin Signed-off-by: Arnd Bergmann Signed-off-by: Russell King (Oracle) List of files: /linux-6.15/arch/arm/mm/Kconfig

89a0b011 - ARM: 9091/1: Revert "mm: qsd8x50: Fix incorrect permission faults"

Thu, 03 Jun 2021 12:27:35 +0000

ARM: 9091/1: Revert "mm: qsd8x50: Fix incorrect permission faults"This reverts commit e220ba60223a9d63e70217e5b112160df8c21cea.The VERIFY_PERMISSION_FAULT is introduced since 2009 but noone use it, just revert it and clean unused comment.Signed-off-by: Kefeng Wang Signed-off-by: Russell King List of files: /linux-6.15/arch/arm/mm/Kconfig

cc611137 - ARM: drop efm32 platform

Fri, 15 Jan 2021 15:51:24 +0000

ARM: drop efm32 platformI didn't touch this code since it served as a platform to introduceARMv7-M support to Linux. The only known machine that runs Linux has only4 MiB of RAM (that originally only exists to hold the display's framebuffer).There are no known users and no further use foreseeable, so drop thecode.Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20210115155130.185010-2-u.kleine-koenig@pengutronix.de'Signed-off-by: Arnd Bergmann List of files: /linux-6.15/arch/arm/mm/Kconfig

28187dc8 - ARM: 9025/1: Kconfig: CPU_BIG_ENDIAN depends on !LD_IS_LLD

Mon, 16 Nov 2020 23:46:39 +0000

ARM: 9025/1: Kconfig: CPU_BIG_ENDIAN depends on !LD_IS_LLDLLD does not yet support any big endian architectures. Make this confignon-selectable when using LLD until LLD is fixed.Link: https://github.com/ClangBuiltLinux/linux/issues/965Signed-off-by: Nick Desaulniers Tested-by: Nathan Chancellor Reviewed-by: Nathan Chancellor Reported-by: kbuild test robot Signed-off-by: Russell King List of files: /linux-6.15/arch/arm/mm/Kconfig

f86fd32d - lib/vdso: Cleanup clock mode storage leftovers

Fri, 07 Feb 2020 12:38:59 +0000

lib/vdso: Cleanup clock mode storage leftoversNow that all architectures are converted to use the generic storage thehelpers and conditionals can be removed.Signed-off-by: Thomas Gleixner Tested-by: Vincenzo Frascino Reviewed-by: Vincenzo Frascino Link: https://lkml.kernel.org/r/20200207124403.470699892@linutronix.de List of files: /linux-6.15/arch/arm/mm/Kconfig

5e3c6a31 - ARM/arm64: vdso: Use common vdso clock mode storage

Fri, 07 Feb 2020 12:38:58 +0000

ARM/arm64: vdso: Use common vdso clock mode storageConvert ARM/ARM64 to the generic VDSO clock mode storage. This needs tohappen in one go as they share the clocksource driver.Signed-off-by: Thomas Gleixner Tested-by: Vincenzo Frascino Reviewed-by: Vincenzo Frascino Link: https://lkml.kernel.org/r/20200207124403.363235229@linutronix.de List of files: /linux-6.15/arch/arm/mm/Kconfig

20e2fc42 - ARM: 8930/1: Add support for generic vDSO

Mon, 04 Nov 2019 10:59:59 +0000

ARM: 8930/1: Add support for generic vDSOThe arm vDSO library requires some adaptations to take advantage ofthe newly introduced generic vDSO library.Introduce the following changes: - Modification vdso.c to be compliant with the common vdso datapage - Use of lib/vdso for gettimeofday - Implementation of elf noteSigned-off-by: Vincenzo Frascino Signed-off-by: Russell King List of files: /linux-6.15/arch/arm/mm/Kconfig

df8bf2d8 - ARM: mmp: don't select CACHE_TAUROS2 on all ARCH_MMP

Fri, 07 Jun 2019 21:28:20 +0000

ARM: mmp: don't select CACHE_TAUROS2 on all ARCH_MMPMMP3 has a PJ4B with a Tauros 3 cache controller that uses CACHE_L2X0instead, while CACHE_TAUROS2 is present on PJ4 and PJ1 (Mohawk) basedplatforms only.Signed-off-by: Lubomir Rintel List of files: /linux-6.15/arch/arm/mm/Kconfig

936376f8 - arm: select the dma-noncoherent symbols for all swiotlb builds

Tue, 20 Aug 2019 01:08:38 +0000

arm: select the dma-noncoherent symbols for all swiotlb buildsWe need to provide the arch hooks for non-coherent dma-directand swiotlb for all swiotlb builds, not just when LPAS is enabled.Without that the Xen build that selects SWIOTLB indirectly throughSWIOTLB_XEN fails to build.Fixes: ad3c7b18c5b3 ("arm: use swiotlb for bounce buffering on LPAE configs")Reported-by: Stefan Wahren Signed-off-by: Christoph Hellwig Tested-by: Stefan Wahren List of files: /linux-6.15/arch/arm/mm/Kconfig