lock_anon_vma

Name:This is a useful helper function for locking the anon_vma root as* we traverse the vma->anon_vma_chain, looping over anon_vma's that* have the same vma.* Such anon_vma's should have the same root, so you'd expect to see

Proto:static inline struct anon_vma *lock_anon_vma_root(struct anon_vma *root, struct anon_vma *anon_vma)

Type:struct anon_vma

Parameter:

Type	Parameter	Name
struct anon_vma *	root
struct anon_vma *	anon_vma

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new_root = Root of this anon_vma tree

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If new_root != root Then

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If WARN_ON_ONCE(root) Then lease a write lock

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root = new_root

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lock for writing

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Return root

**Caller**
Name	Describe
anon_vma_clone	Attach the anon_vmas from src to dst
unlink_anon_vmas

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