um: Remove broken highmem support

Highmem was always buggy and experimental on UML(i386).
In times where 64 bit computers are default we can
remove that experimental code.

Signed-off-by: Richard Weinberger <richard@nod.at>

diff --git a/arch/um/Kconfig.um b/arch/um/Kconfig.um
index ff86fbedc2fc821c2c2a1a3c57ce639f03164e41..8c46978ff70b69d19f75d3055083bec9aaba0495 100644 (file)
--- a/arch/um/Kconfig.um
+++ b/arch/um/Kconfig.um
@@ -95,18 +95,6 @@ config MAGIC_SYSRQ
          The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
          unless you really know what this hack does.
 
-config HIGHMEM
-       bool "Highmem support"
-       depends on !64BIT && BROKEN
-       default n
-       help
-         This was used to allow UML to run with big amounts of memory.
-         Currently it is unstable, so if unsure say N.
-
-         To use big amounts of memory, it is recommended enable static
-         linking (i.e. CONFIG_STATIC_LINK) - this should allow the
-         guest to use up to 2.75G of memory.
-
 config KERNEL_STACK_ORDER
        int "Kernel stack size order"
        default 1 if 64BIT

diff --git a/arch/um/include/asm/fixmap.h b/arch/um/include/asm/fixmap.h
index 3094ea3c73b094e970ded6d775efa7602588151f..1761fd75bf133607c9961f74bbc7f667b6dd3853 100644 (file)
--- a/arch/um/include/asm/fixmap.h
+++ b/arch/um/include/asm/fixmap.h
@@ -33,10 +33,6 @@
  * fix-mapped?
  */
 enum fixed_addresses {
-#ifdef CONFIG_HIGHMEM
-       FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
-       FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
-#endif
        __end_of_fixed_addresses
 };
 

diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
index 2324b624f1957754eb337cfd1b06d90f74f1b60c..18eb9924dda382f08e8cb3cb5b88e0454d621c1e 100644 (file)
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -47,11 +47,7 @@ extern unsigned long end_iomem;
 #define VMALLOC_OFFSET (__va_space)
 #define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
-#ifdef CONFIG_HIGHMEM
-# define VMALLOC_END   (PKMAP_BASE-2*PAGE_SIZE)
-#else
-# define VMALLOC_END   (FIXADDR_START-2*PAGE_SIZE)
-#endif
+#define VMALLOC_END    (FIXADDR_START-2*PAGE_SIZE)
 #define MODULES_VADDR  VMALLOC_START
 #define MODULES_END    VMALLOC_END
 #define MODULES_LEN    (MODULES_VADDR - MODULES_END)

diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 8636e905426f195ab2e8e2600cfe719676f70178..b2a2dff50b4e1983a89b9257de79417333c1f2b6 100644 (file)
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -38,19 +38,6 @@ int kmalloc_ok = 0;
 /* Used during early boot */
 static unsigned long brk_end;
 
-#ifdef CONFIG_HIGHMEM
-static void setup_highmem(unsigned long highmem_start,
-                         unsigned long highmem_len)
-{
-       unsigned long highmem_pfn;
-       int i;
-
-       highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT;
-       for (i = 0; i < highmem_len >> PAGE_SHIFT; i++)
-               free_highmem_page(&mem_map[highmem_pfn + i]);
-}
-#endif
-
 void __init mem_init(void)
 {
        /* clear the zero-page */
@@ -67,9 +54,6 @@ void __init mem_init(void)
        /* this will put all low memory onto the freelists */
        free_all_bootmem();
        max_low_pfn = totalram_pages;
-#ifdef CONFIG_HIGHMEM
-       setup_highmem(end_iomem, highmem);
-#endif
        max_pfn = totalram_pages;
        mem_init_print_info(NULL);
        kmalloc_ok = 1;
@@ -127,49 +111,6 @@ static void __init fixrange_init(unsigned long start, unsigned long end,
        }
 }
 
-#ifdef CONFIG_HIGHMEM
-pte_t *kmap_pte;
-pgprot_t kmap_prot;
-
-#define kmap_get_fixmap_pte(vaddr)                                     \
-       pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)),\
-                                    (vaddr)), (vaddr))
-
-static void __init kmap_init(void)
-{
-       unsigned long kmap_vstart;
-
-       /* cache the first kmap pte */
-       kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
-       kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
-
-       kmap_prot = PAGE_KERNEL;
-}
-
-static void __init init_highmem(void)
-{
-       pgd_t *pgd;
-       pud_t *pud;
-       pmd_t *pmd;
-       pte_t *pte;
-       unsigned long vaddr;
-
-       /*
-        * Permanent kmaps:
-        */
-       vaddr = PKMAP_BASE;
-       fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir);
-
-       pgd = swapper_pg_dir + pgd_index(vaddr);
-       pud = pud_offset(pgd, vaddr);
-       pmd = pmd_offset(pud, vaddr);
-       pte = pte_offset_kernel(pmd, vaddr);
-       pkmap_page_table = pte;
-
-       kmap_init();
-}
-#endif /* CONFIG_HIGHMEM */
-
 static void __init fixaddr_user_init( void)
 {
 #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
@@ -211,9 +152,6 @@ void __init paging_init(void)
 
        zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) -
                (uml_physmem >> PAGE_SHIFT);
-#ifdef CONFIG_HIGHMEM
-       zones_size[ZONE_HIGHMEM] = highmem >> PAGE_SHIFT;
-#endif
        free_area_init(zones_size);
 
        /*
@@ -224,10 +162,6 @@ void __init paging_init(void)
        fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir);
 
        fixaddr_user_init();
-
-#ifdef CONFIG_HIGHMEM
-       init_highmem();
-#endif
 }
 
 /*

diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index cd09285facf4412f96eae30fc7cca041b07e4187..9b06957e98ce496ac5701c1ea5f123dfe5d69a32 100644 (file)
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -301,11 +301,6 @@ int __init linux_main(int argc, char **argv)
        if (physmem_size + iomem_size > max_physmem) {
                highmem = physmem_size + iomem_size - max_physmem;
                physmem_size -= highmem;
-#ifndef CONFIG_HIGHMEM
-               highmem = 0;
-               printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
-                      "to %Lu bytes\n", physmem_size);
-#endif
        }
 
        high_physmem = uml_physmem + physmem_size;

diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
index eafa324eb7a5eafcede8ee45ebfef48a58180327..acb384d246694e974d5d722edd96856e2774fc1b 100644 (file)
--- a/arch/x86/um/Makefile
+++ b/arch/x86/um/Makefile
@@ -21,7 +21,6 @@ obj-$(CONFIG_BINFMT_ELF) += elfcore.o
 
 subarch-y = ../lib/string_32.o ../lib/atomic64_32.o ../lib/atomic64_cx8_32.o
 subarch-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += ../lib/rwsem.o
-subarch-$(CONFIG_HIGHMEM) += ../mm/highmem_32.o
 
 else