From: Arnd Bergmann <arnd@xxxxxxxx> It is possible to build MMU-less kernels for Cortex-M base microcrontrollers as well as a couple of older platforms that have not been converted to CONFIG_ARCH_MULTIPLATFORM, specifically ep93xx, footbridge, dove, sa1100 and s3c24xx. It seems unlikely that anybody has tested those configurations in recent years, as even building them is frequently broken. A patch I submitted caused another build time regression in this configuration. I sent a patch for that, but it seems better to also remove the option entirely, leaving ARMv7-M as the only supported Arm NOMMU target for simplicity. A couple of platforms have dependencies on CONFIG_MMU, those can all be removed now. Notably, mach-integrator tries to support MMU-less CPU cores, but those have not actually been selectable for a long time. This addresses several build failures in randconfig builds that have accumulated over the years. Cc: Vladimir Murzin <vladimir.murzin@xxxxxxx> Cc: Russell King <linux@xxxxxxxxxxxxxxx> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> --- If there are no objections, I'd apply this patch to the soc tree for 5.18 as a cleanup. --- arch/arm/Kconfig | 34 +++++++---------- arch/arm/mach-bcm/Kconfig | 1 - .../mach-footbridge/include/mach/hardware.h | 20 ++++------ arch/arm/mach-footbridge/include/mach/io.h | 20 ---------- arch/arm/mach-integrator/Kconfig | 37 +------------------ arch/arm/mach-integrator/hardware.h | 5 --- arch/arm/mach-nspire/Kconfig | 1 - arch/arm/mach-orion5x/Kconfig | 2 +- arch/arm/mach-shmobile/Kconfig | 2 +- arch/arm/mach-ux500/Kconfig | 2 +- 10 files changed, 24 insertions(+), 100 deletions(-) delete mode 100644 arch/arm/mach-footbridge/include/mach/io.h diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 5f0b40bab4fb..d184377ce2ae 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -304,6 +304,17 @@ config MMU Select if you want MMU-based virtualised addressing space support by paged memory management. If unsure, say 'Y'. +config ARM_SINGLE_ARMV7M + def_bool !MMU + select ARM_NVIC + select AUTO_ZRELADDR + select TIMER_OF + select COMMON_CLK + select CPU_V7M + select NO_IOPORT_MAP + select SPARSE_IRQ + select USE_OF + config ARCH_MMAP_RND_BITS_MIN default 8 @@ -318,12 +329,11 @@ config ARCH_MMAP_RND_BITS_MAX # choice prompt "ARM system type" - default ARM_SINGLE_ARMV7M if !MMU - default ARCH_MULTIPLATFORM if MMU + depends on MMU + default ARCH_MULTIPLATFORM config ARCH_MULTIPLATFORM bool "Allow multiple platforms to be selected" - depends on MMU select ARCH_FLATMEM_ENABLE select ARCH_SPARSEMEM_ENABLE select ARCH_SELECT_MEMORY_MODEL @@ -337,18 +347,6 @@ config ARCH_MULTIPLATFORM select SPARSE_IRQ select USE_OF -config ARM_SINGLE_ARMV7M - bool "ARMv7-M based platforms (Cortex-M0/M3/M4)" - depends on !MMU - select ARM_NVIC - select AUTO_ZRELADDR - select TIMER_OF - select COMMON_CLK - select CPU_V7M - select NO_IOPORT_MAP - select SPARSE_IRQ - select USE_OF - config ARCH_EP93XX bool "EP93xx-based" select ARCH_SPARSEMEM_ENABLE @@ -367,7 +365,6 @@ config ARCH_FOOTBRIDGE bool "FootBridge" select CPU_SA110 select FOOTBRIDGE - select NEED_MACH_IO_H if !MMU select NEED_MACH_MEMORY_H help Support for systems based on the DC21285 companion chip @@ -375,7 +372,6 @@ config ARCH_FOOTBRIDGE config ARCH_IOP32X bool "IOP32x-based" - depends on MMU select CPU_XSCALE select GPIO_IOP select GPIOLIB @@ -387,7 +383,6 @@ config ARCH_IOP32X config ARCH_IXP4XX bool "IXP4xx-based" - depends on MMU select ARCH_SUPPORTS_BIG_ENDIAN select ARM_PATCH_PHYS_VIRT select CPU_XSCALE @@ -418,7 +413,6 @@ config ARCH_DOVE config ARCH_PXA bool "PXA2xx/PXA3xx-based" - depends on MMU select ARCH_MTD_XIP select ARM_CPU_SUSPEND if PM select AUTO_ZRELADDR @@ -437,7 +431,6 @@ config ARCH_PXA config ARCH_RPC bool "RiscPC" - depends on MMU depends on !CC_IS_CLANG && GCC_VERSION < 90100 && GCC_VERSION >= 60000 select ARCH_ACORN select ARCH_MAY_HAVE_PC_FDC @@ -493,7 +486,6 @@ config ARCH_S3C24XX config ARCH_OMAP1 bool "TI OMAP1" - depends on MMU select ARCH_OMAP select CLKSRC_MMIO select GENERIC_IRQ_CHIP diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig index bd3f82788ebc..8db655c3e321 100644 --- a/arch/arm/mach-bcm/Kconfig +++ b/arch/arm/mach-bcm/Kconfig @@ -185,7 +185,6 @@ config ARCH_BCM_53573 config ARCH_BCM_63XX bool "Broadcom BCM63xx DSL SoC" depends on ARCH_MULTI_V7 - depends on MMU select ARCH_HAS_RESET_CONTROLLER select ARM_ERRATA_754322 select ARM_ERRATA_764369 if SMP diff --git a/arch/arm/mach-footbridge/include/mach/hardware.h b/arch/arm/mach-footbridge/include/mach/hardware.h index ecaf6e7388d9..985ad3a95671 100644 --- a/arch/arm/mach-footbridge/include/mach/hardware.h +++ b/arch/arm/mach-footbridge/include/mach/hardware.h @@ -21,32 +21,26 @@ * 0xf0000000 0x80000000 16MB ISA memory */ -#ifdef CONFIG_MMU -#define MMU_IO(a, b) (a) -#else -#define MMU_IO(a, b) (b) -#endif - #define XBUS_SIZE 0x00100000 -#define XBUS_BASE MMU_IO(0xff800000, 0x40000000) +#define XBUS_BASE 0xff800000 #define ARMCSR_SIZE 0x00100000 -#define ARMCSR_BASE MMU_IO(0xfe000000, 0x42000000) +#define ARMCSR_BASE 0xfe000000 #define WFLUSH_SIZE 0x00100000 -#define WFLUSH_BASE MMU_IO(0xfd000000, 0x78000000) +#define WFLUSH_BASE 0xfd000000 #define PCIIACK_SIZE 0x00100000 -#define PCIIACK_BASE MMU_IO(0xfc000000, 0x79000000) +#define PCIIACK_BASE 0xfc000000 #define PCICFG1_SIZE 0x01000000 -#define PCICFG1_BASE MMU_IO(0xfb000000, 0x7a000000) +#define PCICFG1_BASE 0xfb000000 #define PCICFG0_SIZE 0x01000000 -#define PCICFG0_BASE MMU_IO(0xfa000000, 0x7b000000) +#define PCICFG0_BASE 0xfa000000 #define PCIMEM_SIZE 0x01000000 -#define PCIMEM_BASE MMU_IO(0xf0000000, 0x80000000) +#define PCIMEM_BASE 0xf0000000 #define XBUS_CS2 0x40012000 diff --git a/arch/arm/mach-footbridge/include/mach/io.h b/arch/arm/mach-footbridge/include/mach/io.h deleted file mode 100644 index 4e18b921373f..000000000000 --- a/arch/arm/mach-footbridge/include/mach/io.h +++ /dev/null @@ -1,20 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ -/* - * arch/arm/mach-footbridge/include/mach/io.h - * - * Copyright (C) 1997-1999 Russell King - * - * Modifications: - * 06-12-1997 RMK Created. - * 07-04-1999 RMK Major cleanup - */ -#ifndef __ASM_ARM_ARCH_IO_H -#define __ASM_ARM_ARCH_IO_H - -/* - * Translation of various i/o addresses to host addresses for !CONFIG_MMU - */ -#define PCIO_BASE 0x7c000000 -#define __io(a) ((void __iomem *)(PCIO_BASE + (a))) - -#endif diff --git a/arch/arm/mach-integrator/Kconfig b/arch/arm/mach-integrator/Kconfig index 63a0ca82659a..d61ea616cf8e 100644 --- a/arch/arm/mach-integrator/Kconfig +++ b/arch/arm/mach-integrator/Kconfig @@ -42,24 +42,12 @@ config INTEGRATOR_IMPD1 allows ARM(R) Ltd PrimeCells to be developed and evaluated. The IM-PD1 can be found on the Integrator/PP2 platform. -config INTEGRATOR_CM7TDMI - bool "Integrator/CM7TDMI core module" - depends on ARCH_INTEGRATOR_AP - depends on ARCH_MULTI_V4 && !MMU - select CPU_ARM7TDMI - config INTEGRATOR_CM720T bool "Integrator/CM720T core module" depends on ARCH_INTEGRATOR_AP depends on ARCH_MULTI_V4T select CPU_ARM720T -config INTEGRATOR_CM740T - bool "Integrator/CM740T core module" - depends on ARCH_INTEGRATOR_AP - depends on ARCH_MULTI_V4T && !MMU - select CPU_ARM740T - config INTEGRATOR_CM920T bool "Integrator/CM920T core module" depends on ARCH_INTEGRATOR_AP @@ -78,23 +66,6 @@ config INTEGRATOR_CM926EJS depends on ARCH_MULTI_V5 select CPU_ARM926T -config INTEGRATOR_CM940T - bool "Integrator/CM940T core module" - depends on ARCH_INTEGRATOR_AP - depends on ARCH_MULTI_V4T && !MMU - select CPU_ARM940T - -config INTEGRATOR_CM946ES - bool "Integrator/CM946E-S core module" - depends on ARCH_INTEGRATOR_AP - depends on ARCH_MULTI_V5 && !MMU - select CPU_ARM946E - -config INTEGRATOR_CM966ES - bool "Integrator/CM966E-S core module" - depends on ARCH_INTEGRATOR_AP - depends on BROKEN # no kernel support - config INTEGRATOR_CM10200E_REV0 bool "Integrator/CM10200E rev.0 core module" depends on ARCH_INTEGRATOR_AP && n @@ -127,7 +98,7 @@ config INTEGRATOR_CM1136JFS config ARCH_INTEGRATOR_CP bool "Support Integrator/CP platform" - depends on (!MMU || ARCH_MULTI_V5 || ARCH_MULTI_V6) + depends on ARCH_MULTI_V5 || ARCH_MULTI_V6 select ARM_TIMER_SP804 select SERIAL_AMBA_PL011 if TTY select SERIAL_AMBA_PL011_CONSOLE if TTY @@ -135,12 +106,6 @@ config ARCH_INTEGRATOR_CP help Include support for the ARM(R) Integrator CP platform. -config INTEGRATOR_CT7T - bool "Integrator/CT7TD (ARM7TDMI) core tile" - depends on ARCH_INTEGRATOR_CP - depends on ARCH_MULTI_V4T && !MMU - select CPU_ARM7TDMI - config INTEGRATOR_CT926 bool "Integrator/CT926 (ARM926EJ-S) core tile" depends on ARCH_INTEGRATOR_CP diff --git a/arch/arm/mach-integrator/hardware.h b/arch/arm/mach-integrator/hardware.h index 4d6ade3dd4ee..81ce09e3ad45 100644 --- a/arch/arm/mach-integrator/hardware.h +++ b/arch/arm/mach-integrator/hardware.h @@ -16,12 +16,7 @@ #define IO_START INTEGRATOR_HDR_BASE // PA of IO /* macro to get at IO space when running virtually */ -#ifdef CONFIG_MMU #define IO_ADDRESS(x) (((x) & 0x000fffff) | (((x) >> 4) & 0x0ff00000) | IO_BASE) -#else -#define IO_ADDRESS(x) (x) -#endif - #define __io_address(n) ((void __iomem *)IO_ADDRESS(n)) /* diff --git a/arch/arm/mach-nspire/Kconfig b/arch/arm/mach-nspire/Kconfig index b3d161e8e2fb..6ef1b167619b 100644 --- a/arch/arm/mach-nspire/Kconfig +++ b/arch/arm/mach-nspire/Kconfig @@ -2,7 +2,6 @@ config ARCH_NSPIRE bool "TI-NSPIRE based" depends on ARCH_MULTI_V4_V5 - depends on MMU select CPU_ARM926T select GENERIC_IRQ_CHIP select ARM_AMBA diff --git a/arch/arm/mach-orion5x/Kconfig b/arch/arm/mach-orion5x/Kconfig index e94a61901ffd..c77f3b4e287b 100644 --- a/arch/arm/mach-orion5x/Kconfig +++ b/arch/arm/mach-orion5x/Kconfig @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only menuconfig ARCH_ORION5X bool "Marvell Orion" - depends on MMU && ARCH_MULTI_V5 + depends on ARCH_MULTI_V5 select CPU_FEROCEON select GPIOLIB select MVEBU_MBUS diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig index 3683d6f10973..50909c4b95b2 100644 --- a/arch/arm/mach-shmobile/Kconfig +++ b/arch/arm/mach-shmobile/Kconfig @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 menuconfig ARCH_RENESAS bool "Renesas ARM SoCs" - depends on ARCH_MULTI_V7 && MMU + depends on ARCH_MULTI_V7 select ARM_GIC select GPIOLIB select NO_IOPORT_MAP diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig index 24ed7f4a87a4..c18def269137 100644 --- a/arch/arm/mach-ux500/Kconfig +++ b/arch/arm/mach-ux500/Kconfig @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 menuconfig ARCH_U8500 bool "ST-Ericsson U8500 Series" - depends on ARCH_MULTI_V7 && MMU + depends on ARCH_MULTI_V7 select AB8500_CORE select ABX500_CORE select ARM_AMBA -- 2.29.2
