vmemmap: generify initialisation via helpers
Convert the common vmemmap population into initialisation helpers for use by
architecture vmemmap populators. All architecture implementing the
SPARSEMEM_VMEMMAP variant supply an architecture specific vmemmap_populate()
initialiser, which may make use of the helpers.
This allows us to clean up and remove the initialisation Kconfig entries.
With this patch there is a single SPARSEMEM_VMEMMAP_ENABLE Kconfig option to
indicate use of that variant.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index 7bb7a4b..4f2d485 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -14,21 +14,8 @@
* case the overhead consists of a few additional pages that are
* allocated to create a view of memory for vmemmap.
*
- * Special Kconfig settings:
- *
- * CONFIG_ARCH_POPULATES_SPARSEMEM_VMEMMAP
- *
- * The architecture has its own functions to populate the memory
- * map and provides a vmemmap_populate function.
- *
- * CONFIG_ARCH_POPULATES_SPARSEMEM_VMEMMAP_PMD
- *
- * The architecture provides functions to populate the pmd level
- * of the vmemmap mappings. Allowing mappings using large pages
- * where available.
- *
- * If neither are set then PAGE_SIZE mappings are generated which
- * require one PTE/TLB per PAGE_SIZE chunk of the virtual memory map.
+ * The architecture is expected to provide a vmemmap_populate() function
+ * to instantiate the mapping.
*/
#include <linux/mm.h>
#include <linux/mmzone.h>
@@ -60,7 +47,6 @@
__pa(MAX_DMA_ADDRESS));
}
-#ifndef CONFIG_ARCH_POPULATES_SPARSEMEM_VMEMMAP
void __meminit vmemmap_verify(pte_t *pte, int node,
unsigned long start, unsigned long end)
{
@@ -72,104 +58,85 @@
"page_structs\n", start, end - 1);
}
-#ifndef CONFIG_ARCH_POPULATES_SPARSEMEM_VMEMMAP_PMD
-static int __meminit vmemmap_populate_pte(pmd_t *pmd, unsigned long addr,
- unsigned long end, int node)
+pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node)
{
+ pte_t *pte = pte_offset_kernel(pmd, addr);
+ if (pte_none(*pte)) {
+ pte_t entry;
+ void *p = vmemmap_alloc_block(PAGE_SIZE, node);
+ if (!p)
+ return 0;
+ entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL);
+ set_pte_at(&init_mm, addr, pte, entry);
+ }
+ return pte;
+}
+
+pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node)
+{
+ pmd_t *pmd = pmd_offset(pud, addr);
+ if (pmd_none(*pmd)) {
+ void *p = vmemmap_alloc_block(PAGE_SIZE, node);
+ if (!p)
+ return 0;
+ pmd_populate_kernel(&init_mm, pmd, p);
+ }
+ return pmd;
+}
+
+pud_t * __meminit vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node)
+{
+ pud_t *pud = pud_offset(pgd, addr);
+ if (pud_none(*pud)) {
+ void *p = vmemmap_alloc_block(PAGE_SIZE, node);
+ if (!p)
+ return 0;
+ pud_populate(&init_mm, pud, p);
+ }
+ return pud;
+}
+
+pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node)
+{
+ pgd_t *pgd = pgd_offset_k(addr);
+ if (pgd_none(*pgd)) {
+ void *p = vmemmap_alloc_block(PAGE_SIZE, node);
+ if (!p)
+ return 0;
+ pgd_populate(&init_mm, pgd, p);
+ }
+ return pgd;
+}
+
+int __meminit vmemmap_populate_basepages(struct page *start_page,
+ unsigned long size, int node)
+{
+ unsigned long addr = (unsigned long)start_page;
+ unsigned long end = (unsigned long)(start_page + size);
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
pte_t *pte;
- for (pte = pte_offset_kernel(pmd, addr); addr < end;
- pte++, addr += PAGE_SIZE)
- if (pte_none(*pte)) {
- pte_t entry;
- void *p = vmemmap_alloc_block(PAGE_SIZE, node);
- if (!p)
- return -ENOMEM;
-
- entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL);
- set_pte(pte, entry);
-
- } else
- vmemmap_verify(pte, node, addr + PAGE_SIZE, end);
+ for (; addr < end; addr += PAGE_SIZE) {
+ pgd = vmemmap_pgd_populate(addr, node);
+ if (!pgd)
+ return -ENOMEM;
+ pud = vmemmap_pud_populate(pgd, addr, node);
+ if (!pud)
+ return -ENOMEM;
+ pmd = vmemmap_pmd_populate(pud, addr, node);
+ if (!pmd)
+ return -ENOMEM;
+ pte = vmemmap_pte_populate(pmd, addr, node);
+ if (!pte)
+ return -ENOMEM;
+ vmemmap_verify(pte, node, addr, addr + PAGE_SIZE);
+ }
return 0;
}
-int __meminit vmemmap_populate_pmd(pud_t *pud, unsigned long addr,
- unsigned long end, int node)
-{
- pmd_t *pmd;
- int error = 0;
- unsigned long next;
-
- for (pmd = pmd_offset(pud, addr); addr < end && !error;
- pmd++, addr = next) {
- if (pmd_none(*pmd)) {
- void *p = vmemmap_alloc_block(PAGE_SIZE, node);
- if (!p)
- return -ENOMEM;
-
- pmd_populate_kernel(&init_mm, pmd, p);
- } else
- vmemmap_verify((pte_t *)pmd, node,
- pmd_addr_end(addr, end), end);
- next = pmd_addr_end(addr, end);
- error = vmemmap_populate_pte(pmd, addr, next, node);
- }
- return error;
-}
-#endif /* CONFIG_ARCH_POPULATES_SPARSEMEM_VMEMMAP_PMD */
-
-static int __meminit vmemmap_populate_pud(pgd_t *pgd, unsigned long addr,
- unsigned long end, int node)
-{
- pud_t *pud;
- int error = 0;
- unsigned long next;
-
- for (pud = pud_offset(pgd, addr); addr < end && !error;
- pud++, addr = next) {
- if (pud_none(*pud)) {
- void *p = vmemmap_alloc_block(PAGE_SIZE, node);
- if (!p)
- return -ENOMEM;
-
- pud_populate(&init_mm, pud, p);
- }
- next = pud_addr_end(addr, end);
- error = vmemmap_populate_pmd(pud, addr, next, node);
- }
- return error;
-}
-
-int __meminit vmemmap_populate(struct page *start_page,
- unsigned long nr, int node)
-{
- pgd_t *pgd;
- unsigned long addr = (unsigned long)start_page;
- unsigned long end = (unsigned long)(start_page + nr);
- unsigned long next;
- int error = 0;
-
- printk(KERN_DEBUG "[%lx-%lx] Virtual memory section"
- " (%ld pages) node %d\n", addr, end - 1, nr, node);
-
- for (pgd = pgd_offset_k(addr); addr < end && !error;
- pgd++, addr = next) {
- if (pgd_none(*pgd)) {
- void *p = vmemmap_alloc_block(PAGE_SIZE, node);
- if (!p)
- return -ENOMEM;
-
- pgd_populate(&init_mm, pgd, p);
- }
- next = pgd_addr_end(addr,end);
- error = vmemmap_populate_pud(pgd, addr, next, node);
- }
- return error;
-}
-#endif /* !CONFIG_ARCH_POPULATES_SPARSEMEM_VMEMMAP */
-
struct page __init *sparse_early_mem_map_populate(unsigned long pnum, int nid)
{
struct page *map = pfn_to_page(pnum * PAGES_PER_SECTION);