[PATCH] configfs: Convenience macros for attribute definition.
[linux-2.6] / include / asm-x86 / mmu_context_64.h
1 #ifndef __X86_64_MMU_CONTEXT_H
2 #define __X86_64_MMU_CONTEXT_H
3
4 #include <asm/pda.h>
5
6 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
7 {
8 #ifdef CONFIG_SMP
9         if (read_pda(mmu_state) == TLBSTATE_OK)
10                 write_pda(mmu_state, TLBSTATE_LAZY);
11 #endif
12 }
13
14 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
15                              struct task_struct *tsk)
16 {
17         unsigned cpu = smp_processor_id();
18         if (likely(prev != next)) {
19                 /* stop flush ipis for the previous mm */
20                 cpu_clear(cpu, prev->cpu_vm_mask);
21 #ifdef CONFIG_SMP
22                 write_pda(mmu_state, TLBSTATE_OK);
23                 write_pda(active_mm, next);
24 #endif
25                 cpu_set(cpu, next->cpu_vm_mask);
26                 load_cr3(next->pgd);
27
28                 if (unlikely(next->context.ldt != prev->context.ldt))
29                         load_LDT_nolock(&next->context);
30         }
31 #ifdef CONFIG_SMP
32         else {
33                 write_pda(mmu_state, TLBSTATE_OK);
34                 if (read_pda(active_mm) != next)
35                         BUG();
36                 if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
37                         /* We were in lazy tlb mode and leave_mm disabled
38                          * tlb flush IPI delivery. We must reload CR3
39                          * to make sure to use no freed page tables.
40                          */
41                         load_cr3(next->pgd);
42                         load_LDT_nolock(&next->context);
43                 }
44         }
45 #endif
46 }
47
48 #define deactivate_mm(tsk, mm)                  \
49 do {                                            \
50         load_gs_index(0);                       \
51         asm volatile("movl %0,%%fs"::"r"(0));   \
52 } while (0)
53
54 #endif