relay_destroy_buf

Name:lay_destroy_buf - destroy an rchan_buf struct and associated buffer*@buf: the buffer struct

Proto:static void relay_destroy_buf(struct rchan_buf *buf)

Type:void

Parameter:

Type	Parameter	Name
struct rchan_buf *	buf

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chan = associated channel

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If Value is more likely to compile time(start of channel buffer ) Then

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vunmap(start of channel buffer )

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When i < umber of current buffer pages cycle __free_page(array of current buffer pages [i])

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an array of pointers of struct page

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* per_cpu_ptr( per-cpu channel buffers , his buf's cpu ) = NULL

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kfree(padding counts per sub-buffer )

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kref_put - decrement refcount for object.*@kref: object.*@release: pointer to the function that will clean up the object when the* last reference to the object is released.* This pointer is required, and it is not acceptable to pass kfree

**Caller**
Name	Describe
relay_remove_buf	lay_remove_buf - remove a channel buffer@kref: target kernel reference that contains the relay buffer Removes the file from the filesystem, which also frees the* rchan_buf_struct and the channel buffer. Should only be called from* kref_put().
relay_open_buf	lay_open_buf - create a new relay channel buffer* used by relay_open() and CPU hotplug.

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