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>
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 1676d01..3079d0f 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -487,6 +487,11 @@
#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 @@
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 @@
/*
* 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 @@
{
#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 @@
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);
}