From: Dave Hansen <haveblue@us.ibm.com>
To: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>
Cc: Andrew Morton <akpm@zip.com.au>, linux-kernel@vger.kernel.org
Subject: Re: truncate_list_pages() BUG and confusion
Date: Thu, 07 Mar 2002 19:04:38 -0800 [thread overview]
Message-ID: <3C882A46.7060409@us.ibm.com> (raw)
In-Reply-To: <3C880EFF.A0789715@zip.com.au> <1044120155.1015527354@[10.10.2.3]>
Martin J. Bligh wrote:
> Where did truncate_list_pages unlock it? It doesn't do that
> until after it's called truncate_complete_page, which (indirectly)
> frees the page ... ?
Ahh, put_page_testzero
#define put_page_testzero(p) atomic_dec_and_test(&(p)->count)
It will only try to free if the page count is zero. The caller makes
sure that this doesn't happen.
if (!PageReserved(page) && put_page_testzero(page)) {
if (PageLRU(page))
lru_cache_del(page);
__free_pages_ok(page, 0);
}
--
Dave Hansen
haveblue@us.ibm.com
next prev parent reply other threads:[~2002-03-08 3:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-08 0:45 truncate_list_pages() BUG and confusion Dave Hansen
2002-03-08 1:08 ` Andrew Morton
2002-03-08 2:54 ` Dave Hansen
2002-03-08 2:55 ` Martin J. Bligh
2002-03-08 3:02 ` Andrew Morton
2002-03-08 3:04 ` Dave Hansen [this message]
2002-03-08 21:14 ` Martin J. Bligh
2002-03-08 21:53 ` Andrew Morton
2002-03-08 22:13 ` Dave Hansen
2002-03-08 22:35 ` Andrew Morton
2002-03-09 0:04 ` Martin J. Bligh
2002-03-09 0:17 ` Andrew Morton
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