anon_vma_alloc

Name:anon_vma_alloc

Proto:static inline struct anon_vma *anon_vma_alloc(void)

Type:struct anon_vma

Parameter:Nothing

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anon_vma = kmem_cache_alloc(anon_vma_cachep, GFP_KERNEL)

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If anon_vma Then

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atomic_set( & The refcount is taken on an anon_vma when there is no* guarantee that the vma of page tables will exist for* the duration of the operation. A caller that takes* the reference is responsible for clearing up the* anon_vma if they are the last user on release, 1)

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Count of child anon_vmas and VMAs which points to this anon_vma.* This counter is used for making decision about reusing anon_vma* instead of forking new one. See comments in function anon_vma_clone. = 1

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Parent of this anon_vma = anon_vma

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Root of this anon_vma tree = anon_vma

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Return anon_vma

**Caller**
Name	Describe
__anon_vma_prepare	__anon_vma_prepare - attach an anon_vma to a memory region@vma: the memory region in question This makes sure the memory mapping described by 'vma' has* an 'anon_vma' attached to it, so that we can associate the
anon_vma_fork	Attach vma to its own anon_vma, as well as to the anon_vmas that* the corresponding VMA in the parent process is attached to.* Returns 0 on success, non-zero on failure.

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