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>
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
#ifndef __SPARC_MMU_CONTEXT_H
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#define __SPARC_MMU_CONTEXT_H
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#include <asm/btfixup.h>
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#ifndef __ASSEMBLY__
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#include <asm-generic/mm_hooks.h>
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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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/*
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* Initialize a new mmu context. This is invoked when a new
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* address space instance (unique or shared) is instantiated.
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*/
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#define init_new_context(tsk, mm) (((mm)->context = NO_CONTEXT), 0)
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/*
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* Destroy a dead context. This occurs when mmput drops the
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* mm_users count to zero, the mmaps have been released, and
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* all the page tables have been flushed. Our job is to destroy
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* any remaining processor-specific state.
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*/
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BTFIXUPDEF_CALL(void, destroy_context, struct mm_struct *)
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#define destroy_context(mm) BTFIXUP_CALL(destroy_context)(mm)
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/* Switch the current MM context. */
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BTFIXUPDEF_CALL(void, switch_mm, struct mm_struct *, struct mm_struct *, struct task_struct *)
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#define switch_mm(old_mm, mm, tsk) BTFIXUP_CALL(switch_mm)(old_mm, mm, tsk)
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#define deactivate_mm(tsk,mm) do { } while (0)
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/* Activate a new MM instance for the current task. */
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#define activate_mm(active_mm, mm) switch_mm((active_mm), (mm), NULL)
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#endif /* !(__ASSEMBLY__) */
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#endif /* !(__SPARC_MMU_CONTEXT_H) */
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