linux-kernel - free_pages

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Message-ID: <86802c440801071843p583f390as53f8b600622b93b2@mail.gmail.com>
Date:	Mon, 7 Jan 2008 18:43:46 -0800
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Christoph Lameter" <clameter@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Adrian Bunk" <bunk@...sta.de>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: free_pages_check

wonder why free_pages_check mm/page_alloc.c is using bit OR than logical OR

@@ -450,9 +450,9 @@ static inline void __free_one_page(struc

 static inline int free_pages_check(struct page *page)
 {
-       if (unlikely(page_mapcount(page) |
-               (page->mapping != NULL)  |
-               (page_count(page) != 0)  |
+       if (unlikely(page_mapcount(page) ||
+               (page->mapping != NULL)  ||
+               (page_count(page) != 0)  ||
                (page->flags & (
                        1 << PG_lru     |
                        1 << PG_private |

YH
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