diff options
Diffstat (limited to 'libdde_linux26/contrib/include/asm-generic/tlb.h')
| -rw-r--r-- | libdde_linux26/contrib/include/asm-generic/tlb.h | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/libdde_linux26/contrib/include/asm-generic/tlb.h b/libdde_linux26/contrib/include/asm-generic/tlb.h deleted file mode 100644 index f490e43a..00000000 --- a/libdde_linux26/contrib/include/asm-generic/tlb.h +++ /dev/null @@ -1,148 +0,0 @@ -/* include/asm-generic/tlb.h - * - * Generic TLB shootdown code - * - * Copyright 2001 Red Hat, Inc. - * Based on code from mm/memory.c Copyright Linus Torvalds and others. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ -#ifndef _ASM_GENERIC__TLB_H -#define _ASM_GENERIC__TLB_H - -#include <linux/swap.h> -#include <asm/pgalloc.h> -#include <asm/tlbflush.h> - -/* - * For UP we don't need to worry about TLB flush - * and page free order so much.. - */ -#ifdef CONFIG_SMP - #ifdef ARCH_FREE_PTR_NR - #define FREE_PTR_NR ARCH_FREE_PTR_NR - #else - #define FREE_PTE_NR 506 - #endif - #define tlb_fast_mode(tlb) ((tlb)->nr == ~0U) -#else - #define FREE_PTE_NR 1 - #define tlb_fast_mode(tlb) 1 -#endif - -/* struct mmu_gather is an opaque type used by the mm code for passing around - * any data needed by arch specific code for tlb_remove_page. - */ -struct mmu_gather { - struct mm_struct *mm; - unsigned int nr; /* set to ~0U means fast mode */ - unsigned int need_flush;/* Really unmapped some ptes? */ - unsigned int fullmm; /* non-zero means full mm flush */ - struct page * pages[FREE_PTE_NR]; -}; - -/* Users of the generic TLB shootdown code must declare this storage space. */ -DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); - -/* tlb_gather_mmu - * Return a pointer to an initialized struct mmu_gather. - */ -static inline struct mmu_gather * -tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush) -{ - struct mmu_gather *tlb = &get_cpu_var(mmu_gathers); - - tlb->mm = mm; - - /* Use fast mode if only one CPU is online */ - tlb->nr = num_online_cpus() > 1 ? 0U : ~0U; - - tlb->fullmm = full_mm_flush; - - return tlb; -} - -static inline void -tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) -{ - if (!tlb->need_flush) - return; - tlb->need_flush = 0; - tlb_flush(tlb); - if (!tlb_fast_mode(tlb)) { - free_pages_and_swap_cache(tlb->pages, tlb->nr); - tlb->nr = 0; - } -} - -/* tlb_finish_mmu - * Called at the end of the shootdown operation to free up any resources - * that were required. - */ -static inline void -tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) -{ - tlb_flush_mmu(tlb, start, end); - - /* keep the page table cache within bounds */ - check_pgt_cache(); - - put_cpu_var(mmu_gathers); -} - -/* tlb_remove_page - * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), while - * handling the additional races in SMP caused by other CPUs caching valid - * mappings in their TLBs. - */ -static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) -{ - tlb->need_flush = 1; - if (tlb_fast_mode(tlb)) { - free_page_and_swap_cache(page); - return; - } - tlb->pages[tlb->nr++] = page; - if (tlb->nr >= FREE_PTE_NR) - tlb_flush_mmu(tlb, 0, 0); -} - -/** - * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. - * - * Record the fact that pte's were really umapped in ->need_flush, so we can - * later optimise away the tlb invalidate. This helps when userspace is - * unmapping already-unmapped pages, which happens quite a lot. - */ -#define tlb_remove_tlb_entry(tlb, ptep, address) \ - do { \ - tlb->need_flush = 1; \ - __tlb_remove_tlb_entry(tlb, ptep, address); \ - } while (0) - -#define pte_free_tlb(tlb, ptep) \ - do { \ - tlb->need_flush = 1; \ - __pte_free_tlb(tlb, ptep); \ - } while (0) - -#ifndef __ARCH_HAS_4LEVEL_HACK -#define pud_free_tlb(tlb, pudp) \ - do { \ - tlb->need_flush = 1; \ - __pud_free_tlb(tlb, pudp); \ - } while (0) -#endif - -#define pmd_free_tlb(tlb, pmdp) \ - do { \ - tlb->need_flush = 1; \ - __pmd_free_tlb(tlb, pmdp); \ - } while (0) - -#define tlb_migrate_finish(mm) do {} while (0) - -#endif /* _ASM_GENERIC__TLB_H */ |