include/asm-arm26/tlb.h

   1 #ifndef __ASMARM_TLB_H
   2 #define __ASMARM_TLB_H
   3
   4 #include <asm/pgalloc.h>
   5 #include <asm/tlbflush.h>
   6
   7 /*
   8  * TLB handling.  This allows us to remove pages from the page
   9  * tables, and efficiently handle the TLB issues.
  10  */
  11 struct mmu_gather {
  12         struct mm_struct        *mm;
  13         unsigned int            freed;
  14
  15         unsigned int            flushes;
  16         unsigned int            avoided_flushes;
  17 };
  18
  19 extern struct mmu_gather mmu_gathers[NR_CPUS];
  20
  21 static inline struct mmu_gather *
  22 tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
  23 {
  24         int cpu = smp_processor_id();
  25         struct mmu_gather *tlb = &mmu_gathers[cpu];
  26
  27         tlb->mm = mm;
  28         tlb->freed = 0;
  29
  30         return tlb;
  31 }
  32
  33 static inline void
  34 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
  35 {
  36         struct mm_struct *mm = tlb->mm;
  37         unsigned long freed = tlb->freed;
  38         int rss = mm->rss;
  39
  40         if (rss < freed)
  41                 freed = rss;
  42         mm->rss = rss - freed;
  43
  44         if (freed) {
  45                 flush_tlb_mm(mm);
  46                 tlb->flushes++;
  47         } else {
  48                 tlb->avoided_flushes++;
  49         }
  50
  51         /* keep the page table cache within bounds */
  52         check_pgt_cache();
  53 }
  54
  55 #define tlb_remove_tlb_entry(tlb,ptep,address)  do { } while (0)
  56 #define tlb_start_vma(tlb,vma)                  do { } while (0)
  57 #define tlb_end_vma(tlb,vma)                    do { } while (0)
  58
  59 #define tlb_remove_page(tlb,page)       free_page_and_swap_cache(page)
  60 #define pte_free_tlb(tlb,ptep)          pte_free(ptep)
  61 #define pmd_free_tlb(tlb,pmdp)          pmd_free(pmdp)
  62
  63 #endif