a question about slub in function __slab_free()

From	Xishi Qiu <qiuxishi@huawei.com>
Newsgroups	linux.kernel
Subject	a question about slub in function __slab_free()
Date	2016-03-02 13:40 +0100
Message-ID	<r8eel-7A8-5@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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___slab_alloc()
	deactivate_slab()
		add_full(s, n, page);
The page will be added to full list and the frozen is 0, right?

__slab_free()
	prior = page->freelist;  // prior is NULL
	was_frozen = new.frozen;  // was_frozen is 0
	...
		/*
		 * Slab was on no list before and will be
		 * partially empty
		 * We can defer the list move and instead
		 * freeze it.
		 */
		new.frozen = 1;
	...

I don't understand why "Slab was on no list before"?

Thanks,
Xishi Qiu

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a question about slub in function __slab_free() Xishi Qiu <qiuxishi@huawei.com> - 2016-03-02 13:40 +0100
  Re: a question about slub in function __slab_free() Joonsoo Kim <js1304@gmail.com> - 2016-03-02 15:40 +0100
    Re: a question about slub in function __slab_free() Xishi Qiu <qiuxishi@huawei.com> - 2016-03-03 02:40 +0100
  Re: a question about slub in function __slab_free() Jianyu Zhan <nasa4836@gmail.com> - 2016-03-02 16:20 +0100

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