Merge tag 'microblaze-v5.11' of git://git.monstr.eu/linux-2.6-microblaze

Pull microblaze updates from Michal Simek:
 "The biggest change is to remove support for noMMU configuration.

  FPGAs are bigger so people use Microblaze with MMU for a lot of years
  and there is likely no user of this code anymore. No one is updating
  libraries for this configuration either.

   - Remove noMMU support

   - Add support for TIF_NOTIFY_SIGNAL

   - Small header fix"

* tag 'microblaze-v5.11' of git://git.monstr.eu/linux-2.6-microblaze:
  microblaze: Remove noMMU code
  microblaze: add support for TIF_NOTIFY_SIGNAL
  microblaze: Replace <linux/clk-provider.h> by <linux/of_clk.h>

33 files changed, 16 insertions, 1255 deletions

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 93d459f016fc..f82795592ce5 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -3,19 +3,17 @@ config MICROBLAZE
 	def_bool y
 	select ARCH_32BIT_OFF_T
 	select ARCH_NO_SWAP
-	select ARCH_HAS_BINFMT_FLAT if !MMU
 	select ARCH_HAS_DMA_PREP_COHERENT
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_SYNC_DMA_FOR_CPU
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
-	select ARCH_HAS_DMA_SET_UNCACHED if !MMU
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select BUILDTIME_TABLE_SORT
 	select TIMER_OF
 	select CLONE_BACKWARDS3
 	select COMMON_CLK
-	select DMA_DIRECT_REMAP if MMU
+	select DMA_DIRECT_REMAP
 	select GENERIC_ATOMIC64
 	select GENERIC_CPU_DEVICES
 	select GENERIC_IDLE_POLL_SETUP
@@ -44,7 +42,7 @@ config MICROBLAZE
 	select TRACING_SUPPORT
 	select VIRT_TO_BUS
 	select CPU_NO_EFFICIENT_FFS
-	select MMU_GATHER_NO_RANGE if MMU
+	select MMU_GATHER_NO_RANGE
 	select SPARSE_IRQ
 	select SET_FS
 
@@ -95,8 +93,7 @@ menu "Processor type and features"
 source "kernel/Kconfig.hz"
 
 config MMU
-	bool "MMU support"
-	default n
+	def_bool y
 
 comment "Boot options"
 
@@ -142,18 +139,8 @@ config ADVANCED_OPTIONS
 comment "Default settings for advanced configuration options are used"
 	depends on !ADVANCED_OPTIONS
 
-config XILINX_UNCACHED_SHADOW
-	bool "Are you using uncached shadow for RAM ?"
-	depends on ADVANCED_OPTIONS && !MMU
-	default n
-	help
-	  This is needed to be able to allocate uncachable memory regions.
-	  The feature requires the design to define the RAM memory controller
-	  window to be twice as large as the actual physical memory.
-
 config HIGHMEM
 	bool "High memory support"
-	depends on MMU
 	select KMAP_LOCAL
 	help
 	  The address space of Microblaze processors is only 4 Gigabytes large
@@ -167,7 +154,7 @@ config HIGHMEM
 
 config LOWMEM_SIZE_BOOL
 	bool "Set maximum low memory"
-	depends on ADVANCED_OPTIONS && MMU
+	depends on ADVANCED_OPTIONS
 	help
 	  This option allows you to set the maximum amount of memory which
 	  will be used as "low memory", that is, memory which the kernel can
@@ -205,12 +192,11 @@ config KERNEL_START_BOOL
 
 config KERNEL_START
 	hex "Virtual address of kernel base" if KERNEL_START_BOOL
-	default "0xc0000000" if MMU
-	default KERNEL_BASE_ADDR if !MMU
+	default "0xc0000000"
 
 config TASK_SIZE_BOOL
 	bool "Set custom user task size"
-	depends on ADVANCED_OPTIONS && MMU
+	depends on ADVANCED_OPTIONS
 	help
 	  This option allows you to set the amount of virtual address space
 	  allocated to user tasks.  This can be useful in optimizing the
@@ -222,33 +208,6 @@ config TASK_SIZE
 	hex "Size of user task space" if TASK_SIZE_BOOL
 	default "0x80000000"
 
-choice
-	prompt "Page size"
-	default MICROBLAZE_4K_PAGES
-	depends on ADVANCED_OPTIONS && !MMU
-	help
-	  Select the kernel logical page size. Increasing the page size
-	  will reduce software overhead at each page boundary, allow
-	  hardware prefetch mechanisms to be more effective, and allow
-	  larger dma transfers increasing IO efficiency and reducing
-	  overhead. However the utilization of memory will increase.
-	  For example, each cached file will using a multiple of the
-	  page size to hold its contents and the difference between the
-	  end of file and the end of page is wasted.
-
-	  If unsure, choose 4K_PAGES.
-
-config MICROBLAZE_4K_PAGES
-	bool "4k page size"
-
-config MICROBLAZE_16K_PAGES
-	bool "16k page size"
-
-config MICROBLAZE_64K_PAGES
-	bool "64k page size"
-
-endchoice
-
 endmenu
 
 menu "Bus Options"
diff --git a/arch/microblaze/Makefile b/arch/microblaze/Makefile
index 7b340a35b194..bb980891816d 100644
--- a/arch/microblaze/Makefile
+++ b/arch/microblaze/Makefile
@@ -1,11 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 KBUILD_DEFCONFIG := mmu_defconfig
 
-ifeq ($(CONFIG_MMU),y)
 UTS_SYSNAME = -DUTS_SYSNAME=\"Linux\"
-else
-UTS_SYSNAME = -DUTS_SYSNAME=\"uClinux\"
-endif
 
 # What CPU vesion are we building for, and crack it open
 # as major.minor.rev
@@ -67,12 +63,7 @@ DTB:=$(subst simpleImage.,,$(filter simpleImage.%, $(MAKECMDGOALS)))
 
 core-y	+= $(boot)/dts/
 
-# defines filename extension depending memory management type
-ifeq ($(CONFIG_MMU),)
-MMU := -nommu
-endif
-
-export MMU DTB
+export DTB
 
 all: linux.bin
 
diff --git a/arch/microblaze/configs/mmu_defconfig b/arch/microblaze/configs/mmu_defconfig
index 9b8a50f30662..51337fffb947 100644
--- a/arch/microblaze/configs/mmu_defconfig
+++ b/arch/microblaze/configs/mmu_defconfig
@@ -16,7 +16,6 @@ CONFIG_XILINX_MICROBLAZE0_USE_DIV=1
 CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL=2
 CONFIG_XILINX_MICROBLAZE0_USE_FPU=2
 CONFIG_HZ_100=y
-CONFIG_MMU=y
 CONFIG_CMDLINE_BOOL=y
 CONFIG_CMDLINE_FORCE=y
 CONFIG_HIGHMEM=y
diff --git a/arch/microblaze/configs/nommu_defconfig b/arch/microblaze/configs/nommu_defconfig
deleted file mode 100644
index 8c420782d6e4..000000000000
--- a/arch/microblaze/configs/nommu_defconfig
+++ /dev/null
@@ -1,90 +0,0 @@
-CONFIG_SYSVIPC=y
-CONFIG_POSIX_MQUEUE=y
-CONFIG_AUDIT=y
-CONFIG_BSD_PROCESS_ACCT=y
-CONFIG_BSD_PROCESS_ACCT_V3=y
-CONFIG_IKCONFIG=y
-CONFIG_IKCONFIG_PROC=y
-CONFIG_SYSFS_DEPRECATED=y
-CONFIG_SYSFS_DEPRECATED_V2=y
-# CONFIG_BASE_FULL is not set
-CONFIG_KALLSYMS_ALL=y
-CONFIG_EMBEDDED=y
-CONFIG_SLAB=y
-CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR=1
-CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR=1
-CONFIG_XILINX_MICROBLAZE0_USE_BARREL=1
-CONFIG_XILINX_MICROBLAZE0_USE_DIV=1
-CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL=2
-CONFIG_XILINX_MICROBLAZE0_USE_FPU=2
-CONFIG_HZ_100=y
-CONFIG_CMDLINE_BOOL=y
-CONFIG_CMDLINE_FORCE=y
-CONFIG_PCI_XILINX=y
-CONFIG_MODULES=y
-CONFIG_MODULE_UNLOAD=y
-# CONFIG_BLK_DEV_BSG is not set
-CONFIG_PARTITION_ADVANCED=y
-# CONFIG_EFI_PARTITION is not set
-CONFIG_NET=y
-CONFIG_PACKET=y
-CONFIG_UNIX=y
-CONFIG_INET=y
-# CONFIG_IPV6 is not set
-CONFIG_PCI=y
-CONFIG_MTD=y
-CONFIG_MTD_CMDLINE_PARTS=y
-CONFIG_MTD_BLOCK=y
-CONFIG_MTD_CFI=y
-CONFIG_MTD_CFI_INTELEXT=y
-CONFIG_MTD_CFI_AMDSTD=y
-CONFIG_MTD_RAM=y
-CONFIG_MTD_UCLINUX=y
-CONFIG_BLK_DEV_RAM=y
-CONFIG_BLK_DEV_RAM_SIZE=8192
-CONFIG_NETDEVICES=y
-CONFIG_XILINX_EMACLITE=y
-CONFIG_XILINX_LL_TEMAC=y
-# CONFIG_INPUT is not set
-# CONFIG_SERIO is not set
-# CONFIG_VT is not set
-CONFIG_SERIAL_8250=y
-CONFIG_SERIAL_8250_CONSOLE=y
-CONFIG_SERIAL_OF_PLATFORM=y
-CONFIG_SERIAL_UARTLITE=y
-CONFIG_SERIAL_UARTLITE_CONSOLE=y
-# CONFIG_HW_RANDOM is not set
-CONFIG_XILINX_HWICAP=y
-CONFIG_I2C=y
-CONFIG_I2C_XILINX=y
-CONFIG_SPI=y
-CONFIG_SPI_XILINX=y
-CONFIG_GPIOLIB=y
-CONFIG_GPIO_SYSFS=y
-CONFIG_GPIO_XILINX=y
-CONFIG_POWER_RESET=y
-CONFIG_POWER_RESET_GPIO_RESTART=y
-# CONFIG_HWMON is not set
-CONFIG_WATCHDOG=y
-CONFIG_XILINX_WATCHDOG=y
-CONFIG_FB=y
-CONFIG_FB_XILINX=y
-# CONFIG_USB_SUPPORT is not set
-CONFIG_EXT3_FS=y
-# CONFIG_DNOTIFY is not set
-CONFIG_CRAMFS=y
-CONFIG_ROMFS_FS=y
-CONFIG_NFS_FS=y
-CONFIG_NFS_V3_ACL=y
-CONFIG_NLS=y
-CONFIG_KEYS=y
-CONFIG_ENCRYPTED_KEYS=y
-CONFIG_CRYPTO_ECB=y
-CONFIG_CRYPTO_MD4=y
-CONFIG_CRYPTO_MD5=y
-CONFIG_CRYPTO_ARC4=y
-CONFIG_CRYPTO_DES=y
-CONFIG_DEBUG_INFO=y
-CONFIG_DEBUG_SLAB=y
-CONFIG_DETECT_HUNG_TASK=y
-CONFIG_DEBUG_SPINLOCK=y
diff --git a/arch/microblaze/include/asm/dma.h b/arch/microblaze/include/asm/dma.h
index e6cb6d0725af..f801582be912 100644
--- a/arch/microblaze/include/asm/dma.h
+++ b/arch/microblaze/include/asm/dma.h
@@ -6,14 +6,8 @@
 #ifndef _ASM_MICROBLAZE_DMA_H
 #define _ASM_MICROBLAZE_DMA_H
 
-#ifndef CONFIG_MMU
-/* we don't have dma address limit. define it as zero to be
- * unlimited. */
-#define MAX_DMA_ADDRESS		(0)
-#else
 /* Virtual address corresponding to last available physical memory address.  */
 #define MAX_DMA_ADDRESS (CONFIG_KERNEL_START + memory_size - 1)
-#endif
 
 #ifdef CONFIG_PCI
 extern int isa_dma_bridge_buggy;
diff --git a/arch/microblaze/include/asm/exceptions.h b/arch/microblaze/include/asm/exceptions.h
index d67e65b72215..967f175173e1 100644
--- a/arch/microblaze/include/asm/exceptions.h
+++ b/arch/microblaze/include/asm/exceptions.h
@@ -11,11 +11,6 @@
 #define _ASM_MICROBLAZE_EXCEPTIONS_H
 
 #ifdef __KERNEL__
-
-#ifndef CONFIG_MMU
-#define EX_HANDLER_STACK_SIZ	(4*19)
-#endif
-
 #ifndef __ASSEMBLY__
 
 /* Macros to enable and disable HW exceptions in the MSR */
diff --git a/arch/microblaze/include/asm/io.h b/arch/microblaze/include/asm/io.h
index 1dd6fae41897..b6a57f8468f0 100644
--- a/arch/microblaze/include/asm/io.h
+++ b/arch/microblaze/include/asm/io.h
@@ -30,15 +30,12 @@ extern resource_size_t isa_mem_base;
 #define PCI_IOBASE	((void __iomem *)_IO_BASE)
 #define IO_SPACE_LIMIT (0xFFFFFFFF)
 
-#ifdef CONFIG_MMU
 #define page_to_bus(page)	(page_to_phys(page))
 
 extern void iounmap(volatile void __iomem *addr);
 
 extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
 
-#endif /* CONFIG_MMU */
-
 /* Big Endian */
 #define out_be32(a, v) __raw_writel((v), (void __iomem __force *)(a))
 #define out_be16(a, v) __raw_writew((v), (a))
diff --git a/arch/microblaze/include/asm/mmu.h b/arch/microblaze/include/asm/mmu.h
index 97f1243101cc..b928a87c0076 100644
--- a/arch/microblaze/include/asm/mmu.h
+++ b/arch/microblaze/include/asm/mmu.h
@@ -8,9 +8,6 @@
 #ifndef _ASM_MICROBLAZE_MMU_H
 #define _ASM_MICROBLAZE_MMU_H
 
-# ifndef CONFIG_MMU
-#  include <asm-generic/mmu.h>
-# else /* CONFIG_MMU */
 #  ifdef __KERNEL__
 #   ifndef __ASSEMBLY__
 
@@ -119,5 +116,4 @@ extern u32 tlb_skip;
 #  define TLB_G			0x00000001 /* Memory is guarded from prefetch */
 
 #  endif /* __KERNEL__ */
-# endif /* CONFIG_MMU */
 #endif /* _ASM_MICROBLAZE_MMU_H */
diff --git a/arch/microblaze/include/asm/mmu_context.h b/arch/microblaze/include/asm/mmu_context.h
index 34004efb3def..866e52da5eb9 100644
--- a/arch/microblaze/include/asm/mmu_context.h
+++ b/arch/microblaze/include/asm/mmu_context.h
@@ -1,6 +1,2 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-#ifdef CONFIG_MMU
 # include <asm/mmu_context_mm.h>
-#else
-# include <asm-generic/nommu_context.h>
-#endif
diff --git a/arch/microblaze/include/asm/page.h b/arch/microblaze/include/asm/page.h
index b13463d39b38..bf681f272f72 100644
--- a/arch/microblaze/include/asm/page.h
+++ b/arch/microblaze/include/asm/page.h
@@ -20,13 +20,7 @@
 #ifdef __KERNEL__
 
 /* PAGE_SHIFT determines the page size */
-#if defined(CONFIG_MICROBLAZE_64K_PAGES)
-#define PAGE_SHIFT		16
-#elif defined(CONFIG_MICROBLAZE_16K_PAGES)
-#define PAGE_SHIFT		14
-#else
 #define PAGE_SHIFT		12
-#endif
 #define PAGE_SIZE	(ASM_CONST(1) << PAGE_SHIFT)
 #define PAGE_MASK	(~(PAGE_SIZE-1))
 
@@ -44,17 +38,6 @@
 #define PAGE_UP(addr)	(((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
 #define PAGE_DOWN(addr)	((addr)&(~((PAGE_SIZE)-1)))
 
-#ifndef CONFIG_MMU
-/*
- * PAGE_OFFSET -- the first address of the first page of memory. When not
- * using MMU this corresponds to the first free page in physical memory (aligned
- * on a page boundary).
- */
-extern unsigned int __page_offset;
-#define PAGE_OFFSET __page_offset
-
-#else /* CONFIG_MMU */
-
 /*
  * PAGE_OFFSET -- the first address of the first page of memory. With MMU
  * it is set to the kernel start address (aligned on a page boundary).
@@ -70,8 +53,6 @@ extern unsigned int __page_offset;
 typedef unsigned long pte_basic_t;
 #define PTE_FMT		"%.8lx"
 
-#endif /* CONFIG_MMU */
-
 # define copy_page(to, from)			memcpy((to), (from), PAGE_SIZE)
 # define clear_page(pgaddr)			memset((pgaddr), 0, PAGE_SIZE)
 
@@ -86,25 +67,12 @@ typedef struct page *pgtable_t;
 typedef struct { unsigned long	pte; }		pte_t;
 typedef struct { unsigned long	pgprot; }	pgprot_t;
 /* FIXME this can depend on linux kernel version */
-#   ifdef CONFIG_MMU
 typedef struct { unsigned long pgd; } pgd_t;
-#   else /* CONFIG_MMU */
-typedef struct { unsigned long	ste[64]; }	pmd_t;
-typedef struct { pmd_t		pue[1]; }	pud_t;
-typedef struct { pud_t		p4e[1]; }	p4d_t;
-typedef struct { p4d_t		pge[1]; }	pgd_t;
-#   endif /* CONFIG_MMU */
 
 # define pte_val(x)	((x).pte)
 # define pgprot_val(x)	((x).pgprot)
 
-#   ifdef CONFIG_MMU
 #   define pgd_val(x)      ((x).pgd)
-#   else  /* CONFIG_MMU */
-#   define pmd_val(x)	((x).ste[0])
-#   define pud_val(x)	((x).pue[0])
-#   define pgd_val(x)	((x).pge[0])
-#   endif  /* CONFIG_MMU */
 
 # define __pte(x)	((pte_t) { (x) })
 # define __pgd(x)	((pgd_t) { (x) })
@@ -142,28 +110,12 @@ extern int page_is_ram(unsigned long pfn);
 # define virt_to_pfn(vaddr)	(phys_to_pfn((__pa(vaddr))))
 # define pfn_to_virt(pfn)	__va(pfn_to_phys((pfn)))
 
-#  ifdef CONFIG_MMU
-
 #  define virt_to_page(kaddr)	(pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
 #  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
 #  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
 
-#  else /* CONFIG_MMU */
-#  define virt_to_page(vaddr)	(pfn_to_page(virt_to_pfn(vaddr)))
-#  define page_to_virt(page)	(pfn_to_virt(page_to_pfn(page)))
-#  define page_to_phys(page)	(pfn_to_phys(page_to_pfn(page)))
-#  define page_to_bus(page)	(page_to_phys(page))
-#  define phys_to_page(paddr)	(pfn_to_page(phys_to_pfn(paddr)))
-#  endif /* CONFIG_MMU */
-
-#  ifndef CONFIG_MMU
-#  define pfn_valid(pfn)	(((pfn) >= min_low_pfn) && \
-				((pfn) <= (min_low_pfn + max_mapnr)))
-#  define ARCH_PFN_OFFSET	(PAGE_OFFSET >> PAGE_SHIFT)
-#  else /* CONFIG_MMU */
 #  define ARCH_PFN_OFFSET	(memory_start >> PAGE_SHIFT)
 #  define pfn_valid(pfn)	((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
-#  endif /* CONFIG_MMU */
 
 # endif /* __ASSEMBLY__ */
 
@@ -174,12 +126,6 @@ extern int page_is_ram(unsigned long pfn);
 
 /* Convert between virtual and physical address for MMU. */
 /* Handle MicroBlaze processor with virtual memory. */
-#ifndef CONFIG_MMU
-#define __virt_to_phys(addr)	addr
-#define __phys_to_virt(addr)	addr
-#define tophys(rd, rs)	addik rd, rs, 0
-#define tovirt(rd, rs)	addik rd, rs, 0
-#else
 #define __virt_to_phys(addr) \
 	((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 #define __phys_to_virt(addr) \
@@ -188,14 +134,9 @@ extern int page_is_ram(unsigned long pfn);
 	addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 #define tovirt(rd, rs) \
 	addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
-#endif /* CONFIG_MMU */
 
 #define TOPHYS(addr)  __virt_to_phys(addr)
 
-#ifdef CONFIG_MMU
-
-#endif /* CONFIG_MMU */
-
 #endif /* __KERNEL__ */
 
 #include <asm-generic/memory_model.h>
diff --git a/arch/microblaze/include/asm/pgalloc.h b/arch/microblaze/include/asm/pgalloc.h
index 8839ce00ea05..d56b9f670ad1 100644
--- a/arch/microblaze/include/asm/pgalloc.h
+++ b/arch/microblaze/include/asm/pgalloc.h
@@ -8,8 +8,6 @@
 #ifndef _ASM_MICROBLAZE_PGALLOC_H
 #define _ASM_MICROBLAZE_PGALLOC_H
 
-#ifdef CONFIG_MMU
-
 #include <linux/kernel.h>	/* For min/max macros */
 #include <linux/highmem.h>
 #include <linux/pgtable.h>
@@ -42,6 +40,4 @@ extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm);
 #define pmd_populate_kernel(mm, pmd, pte) \
 		(pmd_val(*(pmd)) = (unsigned long) (pte))
 
-#endif /* CONFIG_MMU */
-
 #endif /* _ASM_MICROBLAZE_PGALLOC_H */
diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h
index 3fa1df90925e..9ae8d2c17dd5 100644
--- a/arch/microblaze/include/asm/pgtable.h
+++ b/arch/microblaze/include/asm/pgtable.h
@@ -14,47 +14,6 @@
 extern int mem_init_done;
 #endif
 
-#ifndef CONFIG_MMU
-
-#define pgd_present(pgd)	(1) /* pages are always present on non MMU */
-#define pgd_none(pgd)		(0)
-#define pgd_bad(pgd)		(0)
-#define pgd_clear(pgdp)
-#define kern_addr_valid(addr)	(1)
-
-#define PAGE_NONE		__pgprot(0) /* these mean nothing to non MMU */
-#define PAGE_SHARED		__pgprot(0) /* these mean nothing to non MMU */
-#define PAGE_COPY		__pgprot(0) /* these mean nothing to non MMU */
-#define PAGE_READONLY		__pgprot(0) /* these mean nothing to non MMU */
-#define PAGE_KERNEL		__pgprot(0) /* these mean nothing to non MMU */
-
-#define pgprot_noncached(x)	(x)
-#define pgprot_writecombine	pgprot_noncached
-#define pgprot_device		pgprot_noncached
-
-#define __swp_type(x)		(0)
-#define __swp_offset(x)		(0)
-#define __swp_entry(typ, off)	((swp_entry_t) { ((typ) | ((off) << 7)) })
-#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
-#define __swp_entry_to_pte(x)	((pte_t) { (x).val })
-
-#define ZERO_PAGE(vaddr)	({ BUG(); NULL; })
-
-#define swapper_pg_dir ((pgd_t *) NULL)
-
-#define arch_enter_lazy_cpu_mode()	do {} while (0)
-
-#define pgprot_noncached_wc(prot)	prot
-
-/*
- * All 32bit addresses are effectively valid for vmalloc...
- * Sort of meaningless for non-VM targets.
- */
-#define	VMALLOC_START	0
-#define	VMALLOC_END	0xffffffff
-
-#else /* CONFIG_MMU */
-
 #include <asm-generic/pgtable-nopmd.h>
 
 #ifdef __KERNEL__
@@ -491,8 +450,6 @@ void __init *early_get_page(void);
 #endif /* __ASSEMBLY__ */
 #endif /* __KERNEL__ */
 
-#endif /* CONFIG_MMU */
-
 #ifndef __ASSEMBLY__
 extern unsigned long ioremap_bot, ioremap_base;
 
diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h
index 616211871a6e..06c6e493590a 100644
--- a/arch/microblaze/include/asm/processor.h
+++ b/arch/microblaze/include/asm/processor.h
@@ -31,42 +31,6 @@ extern void ret_from_kernel_thread(void);
 
 # endif /* __ASSEMBLY__ */
 
-# ifndef CONFIG_MMU
-/*
- * User space process size: memory size
- *
- * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
- * user processes and the kernel is on the same memory region. They
- * both share the memory space and that is limited by the amount of
- * physical memory. thus, we set TASK_SIZE == amount of total memory.
- */
-# define TASK_SIZE	(0x81000000 - 0x80000000)
-
-/*
- * This decides where the kernel will search for a free chunk of vm
- * space during mmap's. We won't be using it
- */
-# define TASK_UNMAPPED_BASE	0
-
-/* definition in include/linux/sched.h */
-struct task_struct;
-
-/* thread_struct is gone. use thread_info instead. */
-struct thread_struct { };
-# define INIT_THREAD	{ }
-
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *dead_task)
-{
-}
-
-extern unsigned long get_wchan(struct task_struct *p);
-
-# define KSTK_EIP(tsk)	(0)
-# define KSTK_ESP(tsk)	(0)
-
-# else /* CONFIG_MMU */
-
 /*
  * This is used to define STACK_TOP, and with MMU it must be below
  * kernel base to select the correct PGD when handling MMU exceptions.
@@ -130,5 +94,4 @@ extern struct dentry *of_debugfs_root;
 #endif
 
 #  endif /* __ASSEMBLY__ */
-# endif /* CONFIG_MMU */
 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */
diff --git a/arch/microblaze/include/asm/registers.h b/arch/microblaze/include/asm/registers.h
index ee81e1cba008..6b36693fc621 100644
--- a/arch/microblaze/include/asm/registers.h
+++ b/arch/microblaze/include/asm/registers.h
@@ -27,7 +27,6 @@
 #define FSR_UF		(1<<1) /* Underflow */
 #define FSR_DO		(1<<0) /* Denormalized operand error */
 
-# ifdef CONFIG_MMU
 /* Machine State Register (MSR) Fields */
 # define MSR_UM		(1<<11) /* User Mode */
 # define MSR_UMS	(1<<12) /* User Mode Save */
@@ -43,5 +42,4 @@
 # define	  ESR_DIZ	(1<<11) /* Zone Protection */
 # define	  ESR_S		(1<<10) /* Store instruction */
 
-# endif /* CONFIG_MMU */
 #endif /* _ASM_MICROBLAZE_REGISTERS_H */
diff --git a/arch/microblaze/include/asm/setup.h b/arch/microblaze/include/asm/setup.h
index be10da9d87cb..a06cc1f97aa9 100644
--- a/arch/microblaze/include/asm/setup.h
+++ b/arch/microblaze/include/asm/setup.h
@@ -14,9 +14,7 @@ extern char cmd_line[COMMAND_LINE_SIZE];
 
 extern char *klimit;
 
-#   ifdef CONFIG_MMU
 extern void mmu_reset(void);
-#   endif /* CONFIG_MMU */
 
 void time_init(void);
 void init_IRQ(void);
diff --git a/arch/microblaze/include/asm/thread_info.h b/arch/microblaze/include/asm/thread_info.h
index ad8e8fcb90d3..44f5ca331862 100644
--- a/arch/microblaze/include/asm/thread_info.h
+++ b/arch/microblaze/include/asm/thread_info.h
@@ -107,6 +107,7 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_NEED_RESCHED	3 /* rescheduling necessary */
 /* restore singlestep on return to user mode */
 #define TIF_SINGLESTEP		4
+#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
 #define TIF_MEMDIE		6	/* is terminating due to OOM killer */
 #define TIF_SYSCALL_AUDIT	9       /* syscall auditing active */
 #define TIF_SECCOMP		10      /* secure computing */
@@ -119,6 +120,7 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
+#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
diff --git a/arch/microblaze/include/asm/tlbflush.h b/arch/microblaze/include/asm/tlbflush.h
index 1200e2bf14bb..2038168ed128 100644
--- a/arch/microblaze/include/asm/tlbflush.h
+++ b/arch/microblaze/include/asm/tlbflush.h
@@ -8,8 +8,6 @@
 #ifndef _ASM_MICROBLAZE_TLBFLUSH_H
 #define _ASM_MICROBLAZE_TLBFLUSH_H
 
-#ifdef CONFIG_MMU
-
 #include <linux/sched.h>
 #include <linux/threads.h>
 #include <asm/processor.h>	/* For TASK_SIZE */
@@ -50,16 +48,4 @@ static inline void local_flush_tlb_range(struct vm_area_struct *vma,
 static inline void flush_tlb_pgtables(struct mm_struct *mm,
 	unsigned long start, unsigned long end) { }
 
-#else /* CONFIG_MMU */
-
-#define flush_tlb()				BUG()
-#define flush_tlb_all()				BUG()
-#define flush_tlb_mm(mm)			BUG()
-#define flush_tlb_page(vma, addr)		BUG()
-#define flush_tlb_range(mm, start, end)		BUG()
-#define flush_tlb_pgtables(mm, start, end)	BUG()
-#define flush_tlb_kernel_range(start, end)	BUG()
-
-#endif /* CONFIG_MMU */
-
 #endif /* _ASM_MICROBLAZE_TLBFLUSH_H */
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index 304b04ffea2f..c44b59470e45 100644
--- a/arch/microblaze/include/asm/uaccess.h
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -30,35 +30,14 @@
  */
 # define MAKE_MM_SEG(s)       ((mm_segment_t) { (s) })
 
-#  ifndef CONFIG_MMU
-#  define KERNEL_DS	MAKE_MM_SEG(0)
-#  define USER_DS	KERNEL_DS
-#  else
 #  define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)
 #  define USER_DS	MAKE_MM_SEG(TASK_SIZE - 1)
-#  endif
 
 # define get_fs()	(current_thread_info()->addr_limit)
 # define set_fs(val)	(current_thread_info()->addr_limit = (val))
 
 # define uaccess_kernel()	(get_fs().seg == KERNEL_DS.seg)
 
-#ifndef CONFIG_MMU
-
-/* Check against bounds of physical memory */
-static inline int ___range_ok(unsigned long addr, unsigned long size)
-{
-	return ((addr < memory_start) ||
-		((addr + size - 1) > (memory_start + memory_size - 1)));
-}
-
-#define __range_ok(addr, size) \
-		___range_ok((unsigned long)(addr), (unsigned long)(size))
-
-#define access_ok(addr, size) (__range_ok((addr), (size)) == 0)
-
-#else
-
 static inline int access_ok(const void __user *addr, unsigned long size)
 {
 	if (!size)
@@ -77,15 +56,9 @@ ok:
 			(u32)get_fs().seg);
 	return 1;
 }
-#endif
 
-#ifdef CONFIG_MMU
 # define __FIXUP_SECTION	".section .fixup,\"ax\"\n"
 # define __EX_TABLE_SECTION	".section __ex_table,\"a\"\n"
-#else
-# define __FIXUP_SECTION	".section .discard,\"ax\"\n"
-# define __EX_TABLE_SECTION	".section .discard,\"ax\"\n"
-#endif
 
 extern unsigned long __copy_tofrom_user(void __user *to,
 		const void __user *from, unsigned long size);
diff --git a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile
index dd71637437f4..15a20eb814ce 100644
--- a/arch/microblaze/kernel/Makefile
+++ b/arch/microblaze/kernel/Makefile
@@ -22,9 +22,9 @@ obj-y += dma.o exceptions.o \
 obj-y += cpu/
 
 obj-$(CONFIG_MODULES)		+= microblaze_ksyms.o module.o
-obj-$(CONFIG_MMU)		+= misc.o
+obj-y				+= misc.o
 obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= ftrace.o mcount.o
 obj-$(CONFIG_KGDB)		+= kgdb.o
 
-obj-y	+= entry$(MMU).o
+obj-y	+= entry.o
diff --git a/arch/microblaze/kernel/asm-offsets.c b/arch/microblaze/kernel/asm-offsets.c
index c1b459c97571..6c69ce7be2e8 100644
--- a/arch/microblaze/kernel/asm-offsets.c
+++ b/arch/microblaze/kernel/asm-offsets.c
@@ -70,7 +70,6 @@ int main(int argc, char *argv[])
 
 	/* struct task_struct */
 	DEFINE(TS_THREAD_INFO, offsetof(struct task_struct, stack));
-#ifdef CONFIG_MMU
 	DEFINE(TASK_STATE, offsetof(struct task_struct, state));
 	DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
 	DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
@@ -8