From: "Wang Xiaoqiang" <wang_xiaoq@126.com>
To: vbabka@suse.cz, n-horiguchi@ah.jp.nec.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Question About Functions "__free_pages_check" and "check_new_page" in page_alloc.c
Date: Mon, 16 May 2016 21:42:23 +0800 (CST) [thread overview]
Message-ID: <7374bd2e.da35.154b9cda7d2.Coremail.wang_xiaoq@126.com> (raw)
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Hi all,
I am really confused about these two functions. The following code snippet:
if(unlikely(atomic_read(&page->_mapcount) != -1))
bad_reason ="nonzero mapcount";if(unlikely(page->mapping != NULL))
bad_reason ="non-NULL mapping";if(unlikely(page_ref_count(page) !=0))
bad_reason ="nonzero _count";
...
Wouldn't the previous value of "bad_reason" be overwritten by
the later? Hope to receive from you.
--
thx!
Wang Xiaoqiang
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next reply other threads:[~2016-05-16 13:43 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-16 13:42 Wang Xiaoqiang [this message]
2016-05-16 15:16 ` Michal Hocko
2016-05-17 1:06 ` Wang Xiaoqiang
2016-05-17 5:14 ` Vlastimil Babka
2016-05-17 8:17 ` Wang Xiaoqiang
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