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Commit a98a6d86 authored by Richard Weinberger's avatar Richard Weinberger
Browse files

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: default avatarRichard Weinberger <richard@nod.at>
parent 28fa468f

arch/um/Kconfig.um

+0 −12
Original line number Diff line number Diff line
@@ -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

arch/um/include/asm/fixmap.h

+0 −4
Original line number Diff line number Diff line
@@ -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

};

arch/um/include/asm/pgtable.h

+1 −5
Original line number Diff line number Diff line
@@ -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 MODULES_VADDR	VMALLOC_START

#define MODULES_END	VMALLOC_END

#define MODULES_LEN	(MODULES_VADDR - MODULES_END)

arch/um/kernel/mem.c

+0 −66
Original line number Diff line number Diff line
@@ -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

}



/*

arch/um/kernel/um_arch.c

+0 −5
Original line number Diff line number Diff line
@@ -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;