sparc64: Kill unnecessary tables and increase MAX_BANKS.
swapper_low_pmd_dir and swapper_pud_dir are actually completely
useless and unnecessary.
We just need swapper_pg_dir[]. Naturally the other page table chunks
will be allocated on an as-needed basis. Since the kernel actually
accesses these tables in the PAGE_OFFSET view, there is not even a TLB
locality advantage of placing them in the kernel image.
Use the hard coded vmlinux.ld.S slot for swapper_pg_dir which is
naturally page aligned.
Increase MAX_BANKS to 1024 in order to handle heavily fragmented
virtual guests.
Even with this MAX_BANKS increase, the kernel is 20K+ smaller.
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Bob Picco <bob.picco@oracle.com>
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 0ead74b..2d91c62 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -87,7 +87,7 @@
static unsigned long cpu_pgsz_mask;
-#define MAX_BANKS 32
+#define MAX_BANKS 1024
static struct linux_prom64_registers pavail[MAX_BANKS];
static int pavail_ents;
@@ -1943,12 +1943,6 @@
static unsigned long last_valid_pfn;
-/* These must be page aligned in order to not trigger the
- * alignment tests of pgd_bad() and pud_bad().
- */
-pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((aligned (PAGE_SIZE)));
-static pud_t swapper_pud_dir[PTRS_PER_PUD] __attribute__ ((aligned (PAGE_SIZE)));
-
static void sun4u_pgprot_init(void);
static void sun4v_pgprot_init(void);
@@ -2002,8 +1996,6 @@
{
unsigned long end_pfn, shift, phys_base;
unsigned long real_end, i;
- pud_t *pud;
- pmd_t *pmd;
int node;
setup_page_offset();
@@ -2099,20 +2091,7 @@
*/
init_mm.pgd += ((shift) / (sizeof(pgd_t)));
- memset(swapper_low_pmd_dir, 0, sizeof(swapper_low_pmd_dir));
-
- /* The kernel page tables we publish into what the rest of the
- * world sees must be adjusted so that they see the PAGE_OFFSET
- * address of these in-kerenel data structures. However right
- * here we must access them from the kernel image side, because
- * the trap tables haven't been taken over and therefore we cannot
- * take TLB misses in the PAGE_OFFSET linear mappings yet.
- */
- pud = swapper_pud_dir + (shift / sizeof(pud_t));
- pgd_set(&swapper_pg_dir[0], pud);
-
- pmd = swapper_low_pmd_dir + (shift / sizeof(pmd_t));
- pud_set(&swapper_pud_dir[0], pmd);
+ memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
inherit_prom_mappings();