From d195b71bad4347d2df51072a537f922546a904f1 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Sat, 27 Sep 2014 21:30:57 -0700 Subject: [PATCH] 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 Acked-by: Bob Picco --- arch/sparc/include/asm/pgtable_64.h | 1 - arch/sparc/kernel/vmlinux.lds.S | 5 +++-- arch/sparc/mm/init_64.c | 25 ++----------------------- 3 files changed, 5 insertions(+), 26 deletions(-) diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index c0939228e4b1..bfeb626085ac 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -927,7 +927,6 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, #endif extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; -extern pmd_t swapper_low_pmd_dir[PTRS_PER_PMD]; void paging_init(void); unsigned long find_ecache_flush_span(unsigned long size); diff --git a/arch/sparc/kernel/vmlinux.lds.S b/arch/sparc/kernel/vmlinux.lds.S index 0bacceb19150..09243057cb0b 100644 --- a/arch/sparc/kernel/vmlinux.lds.S +++ b/arch/sparc/kernel/vmlinux.lds.S @@ -35,8 +35,9 @@ jiffies = jiffies_64; SECTIONS { - /* swapper_low_pmd_dir is sparc64 only */ - swapper_low_pmd_dir = 0x0000000000402000; +#ifdef CONFIG_SPARC64 + swapper_pg_dir = 0x0000000000402000; +#endif . = INITIAL_ADDRESS; .text TEXTSTART : { diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 0ead74b2b9e3..2d91c62f7f5f 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -87,7 +87,7 @@ extern struct tsb swapper_tsb[KERNEL_TSB_NENTRIES]; 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 void __init sun4v_linear_pte_xor_finalize(void) 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 @@ void __init paging_init(void) { 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 @@ void __init paging_init(void) */ 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(); -- 2.39.5