4 #include <linux/config.h>
6 #include <asm/atomic.h>
7 #include <asm/pgalloc.h>
8 #include <asm/tlbflush.h>
11 * Used for LDT copy/destruction.
13 int init_new_context(struct task_struct
*tsk
, struct mm_struct
*mm
);
14 void destroy_context(struct mm_struct
*mm
);
18 static inline void enter_lazy_tlb(struct mm_struct
*mm
, struct task_struct
*tsk
, unsigned cpu
)
20 if (cpu_tlbstate
[cpu
].state
== TLBSTATE_OK
)
21 cpu_tlbstate
[cpu
].state
= TLBSTATE_LAZY
;
24 static inline void enter_lazy_tlb(struct mm_struct
*mm
, struct task_struct
*tsk
, unsigned cpu
)
29 static inline void switch_mm(struct mm_struct
*prev
, struct mm_struct
*next
, struct task_struct
*tsk
, unsigned cpu
)
31 if (likely(prev
!= next
)) {
32 /* stop flush ipis for the previous mm */
33 clear_bit(cpu
, &prev
->cpu_vm_mask
);
35 cpu_tlbstate
[cpu
].state
= TLBSTATE_OK
;
36 cpu_tlbstate
[cpu
].active_mm
= next
;
38 set_bit(cpu
, &next
->cpu_vm_mask
);
40 /* Re-load page tables */
44 * load the LDT, if the LDT is different:
46 if (unlikely(prev
->context
.ldt
!= next
->context
.ldt
))
47 load_LDT_nolock(&next
->context
, cpu
);
51 cpu_tlbstate
[cpu
].state
= TLBSTATE_OK
;
52 if (cpu_tlbstate
[cpu
].active_mm
!= next
)
54 if (!test_and_set_bit(cpu
, &next
->cpu_vm_mask
)) {
55 /* We were in lazy tlb mode and leave_mm disabled
56 * tlb flush IPI delivery. We must reload %cr3.
59 load_LDT_nolock(&next
->context
, cpu
);
65 #define deactivate_mm(tsk, mm) \
66 asm("movl %0,%%fs ; movl %0,%%gs": :"r" (0))
68 #define activate_mm(prev, next) \
69 switch_mm((prev),(next),NULL,smp_processor_id())