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Commit d5c98176 authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] mm 2: clean up create_mapping() 



There's now no need to carry around each protection separately.
Instead, pass around the pointer to the entry in the mem_types
array which we're interested in.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 2497f0a8

arch/arm/mm/mmu.c

+13 −17
Original line number Diff line number Diff line
@@ -420,7 +420,7 @@ alloc_init_supersection(unsigned long virt, unsigned long phys, int prot) 
 * the hardware pte table.

 */

static inline void

alloc_init_page(unsigned long virt, unsigned long phys, unsigned int prot_l1, pgprot_t prot)

alloc_init_page(unsigned long virt, unsigned long phys, const struct mem_type *type)

{

	pmd_t *pmdp = pmd_off_k(virt);

	pte_t *ptep;
@@ -429,11 +429,11 @@ alloc_init_page(unsigned long virt, unsigned long phys, unsigned int prot_l1, pg 
		ptep = alloc_bootmem_low_pages(2 * PTRS_PER_PTE *

					       sizeof(pte_t));



		__pmd_populate(pmdp, __pa(ptep) | prot_l1);

		__pmd_populate(pmdp, __pa(ptep) | type->prot_l1);

	}

	ptep = pte_offset_kernel(pmdp, virt);



	set_pte_ext(ptep, pfn_pte(phys >> PAGE_SHIFT, prot), 0);

	set_pte_ext(ptep, pfn_pte(phys >> PAGE_SHIFT, __pgprot(type->prot_pte)), 0);

}



/*
@@ -446,9 +446,8 @@ alloc_init_page(unsigned long virt, unsigned long phys, unsigned int prot_l1, pg 
void __init create_mapping(struct map_desc *md)

{

	unsigned long virt, length;

	int prot_sect, prot_l1, domain;

	pgprot_t prot_pte;

	unsigned long off = (u32)__pfn_to_phys(md->pfn);

	const struct mem_type *type;



	if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) {

		printk(KERN_WARNING "BUG: not creating mapping for "
@@ -464,16 +463,13 @@ void __init create_mapping(struct map_desc *md) 
		       __pfn_to_phys((u64)md->pfn), md->virtual);

	}



	domain	  = mem_types[md->type].domain;

	prot_pte  = __pgprot(mem_types[md->type].prot_pte);

	prot_l1   = mem_types[md->type].prot_l1;

	prot_sect = mem_types[md->type].prot_sect;

	type = &mem_types[md->type];



	/*

	 * Catch 36-bit addresses

	 */

	if(md->pfn >= 0x100000) {

		if(domain) {

		if (type->domain) {

			printk(KERN_ERR "MM: invalid domain in supersection "

				"mapping for 0x%08llx at 0x%08lx\n",

				__pfn_to_phys((u64)md->pfn), md->virtual);
@@ -498,7 +494,7 @@ void __init create_mapping(struct map_desc *md) 
	off   -= virt;

	length = md->length;



	if (mem_types[md->type].prot_l1 == 0 &&

	if (type->prot_l1 == 0 &&

	    (virt & 0xfffff || (virt + off) & 0xfffff || (virt + length) & 0xfffff)) {

		printk(KERN_WARNING "BUG: map for 0x%08lx at 0x%08lx can not "

		       "be mapped using pages, ignoring.\n",
@@ -507,7 +503,7 @@ void __init create_mapping(struct map_desc *md) 
	}



	while ((virt & 0xfffff || (virt + off) & 0xfffff) && length >= PAGE_SIZE) {

		alloc_init_page(virt, virt + off, prot_l1, prot_pte);

		alloc_init_page(virt, virt + off, type);



		virt   += PAGE_SIZE;

		length -= PAGE_SIZE;
@@ -520,7 +516,7 @@ void __init create_mapping(struct map_desc *md) 
	 *	of the actual domain assignments in use.

	 */

	if ((cpu_architecture() >= CPU_ARCH_ARMv6 || cpu_is_xsc3())

		&& domain == 0) {

		&& type->domain == 0) {

		/*

		 * Align to supersection boundary if !high pages.

		 * High pages have already been checked for proper
@@ -532,7 +528,7 @@ void __init create_mapping(struct map_desc *md) 
			while ((virt & ~SUPERSECTION_MASK ||

			        (virt + off) & ~SUPERSECTION_MASK) &&

				length >= (PGDIR_SIZE / 2)) {

				alloc_init_section(virt, virt + off, prot_sect);

				alloc_init_section(virt, virt + off, type->prot_sect);



				virt   += (PGDIR_SIZE / 2);

				length -= (PGDIR_SIZE / 2);
@@ -540,7 +536,7 @@ void __init create_mapping(struct map_desc *md) 
		}



		while (length >= SUPERSECTION_SIZE) {

			alloc_init_supersection(virt, virt + off, prot_sect);

			alloc_init_supersection(virt, virt + off, type->prot_sect);



			virt   += SUPERSECTION_SIZE;

			length -= SUPERSECTION_SIZE;
@@ -551,14 +547,14 @@ void __init create_mapping(struct map_desc *md) 
	 * A section mapping covers half a "pgdir" entry.

	 */

	while (length >= (PGDIR_SIZE / 2)) {

		alloc_init_section(virt, virt + off, prot_sect);

		alloc_init_section(virt, virt + off, type->prot_sect);



		virt   += (PGDIR_SIZE / 2);

		length -= (PGDIR_SIZE / 2);

	}



	while (length >= PAGE_SIZE) {

		alloc_init_page(virt, virt + off, prot_l1, prot_pte);

		alloc_init_page(virt, virt + off, type);



		virt   += PAGE_SIZE;

		length -= PAGE_SIZE;