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d6dd61c831
Add hooks to allow a paravirt implementation to track the lifetime of an mm. Paravirtualization requires three hooks, but only two are needed in common code. They are: arch_dup_mmap, which is called when a new mmap is created at fork arch_exit_mmap, which is called when the last process reference to an mm is dropped, which typically happens on exit and exec. The third hook is activate_mm, which is called from the arch-specific activate_mm() macro/function, and so doesn't need stub versions for other architectures. It's called when an mm is first used. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: linux-arch@vger.kernel.org Cc: James Bottomley <James.Bottomley@SteelEye.com> Acked-by: Ingo Molnar <mingo@elte.hu>
27 lines
776 B
C
27 lines
776 B
C
#ifndef __CRIS_MMU_CONTEXT_H
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#define __CRIS_MMU_CONTEXT_H
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#include <asm-generic/mm_hooks.h>
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extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
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extern void get_mmu_context(struct mm_struct *mm);
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extern void destroy_context(struct mm_struct *mm);
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extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk);
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#define deactivate_mm(tsk,mm) do { } while (0)
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#define activate_mm(prev,next) switch_mm((prev),(next),NULL)
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/* current active pgd - this is similar to other processors pgd
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* registers like cr3 on the i386
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*/
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extern volatile DEFINE_PER_CPU(pgd_t *,current_pgd); /* defined in arch/cris/mm/fault.c */
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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}
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#endif
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