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ARM: early_alloc() 

Add a common early allocator function, in preparation for switching
over to LMB.  When we do, this function will need to do a little more
than just allocating memory; we need it zero initialized too.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-03-25 17:02:59 +00:00
parent 71ee7dad9b
commit 3abe9d33b3
1 changed files with 10 additions and 8 deletions
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18
arch/arm/mm/mmu.c
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@ -487,6 +487,11 @@ static void __init build_mem_type_table(void)
#define vectors_base() (vectors_high() ? 0xffff0000 : 0)
static void __init *early_alloc(unsigned long sz)
{
return alloc_bootmem_low_pages(sz);
}
static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
unsigned long end, unsigned long pfn,
const struct mem_type *type)
@ -494,7 +499,7 @@ static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
pte_t *pte;
if (pmd_none(*pmd)) {
pte = alloc_bootmem_low_pages(2 * PTRS_PER_PTE * sizeof(pte_t));
pte = early_alloc(2 * PTRS_PER_PTE * sizeof(pte_t));
__pmd_populate(pmd, __pa(pte) | type->prot_l1);
}
@ -873,7 +878,7 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
/*
* Allocate the vector page early.
*/
vectors = alloc_bootmem_low_pages(PAGE_SIZE);
vectors = early_alloc(PAGE_SIZE);
for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE)
pmd_clear(pmd_off_k(addr));
@ -945,7 +950,7 @@ static void __init kmap_init(void)
{
#ifdef CONFIG_HIGHMEM
pmd_t *pmd = pmd_off_k(PKMAP_BASE);
pte_t *pte = alloc_bootmem_low_pages(2 * PTRS_PER_PTE * sizeof(pte_t));
pte_t *pte = early_alloc(2 * PTRS_PER_PTE * sizeof(pte_t));
BUG_ON(!pmd_none(*pmd) || !pte);
__pmd_populate(pmd, __pa(pte) | _PAGE_KERNEL_TABLE);
pkmap_page_table = pte + PTRS_PER_PTE;
@ -1005,11 +1010,8 @@ void __init paging_init(struct machine_desc *mdesc)
top_pmd = pmd_off_k(0xffff0000);
/*
* allocate the zero page. Note that this always succeeds and
* returns a zeroed result.
*/
zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
/* allocate the zero page. */
zero_page = early_alloc(PAGE_SIZE);
empty_zero_page = virt_to_page(zero_page);
__flush_dcache_page(NULL, empty_zero_page);
}