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[PATCH 0/6] list: introduce list_last_entry_or_null()

To: linux-kernel@xxxxxxxxxxxxxxx
Subject: [PATCH 0/6] list: introduce list_last_entry_or_null()
From: Jeff Liu <jeff.liu@xxxxxxxxxx>
Date: Fri, 15 Nov 2013 12:29:48 +0800
Cc: akpm@xxxxxxxxxxxxxxxxxxxx, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, cluster-devel@xxxxxxxxxx, linux-mtd@xxxxxxxxxxxxxxxxxxx, jfs-discussion@xxxxxxxxxxxxxxxxxxxxx, oleg@xxxxxxxxxx, jiri@xxxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0
Hi Folks,

This patch is trying to introduce a new list helper to retrieve the
last entry or return NULL if the list is empty corresponding to it,
which is inspired by Jiri Pirko's list_first_entry_or_null().

With this trivial helper, we could get a little benefit to simplify
the code logic of xfs_ail_max() and make the code looks a bit more
consistent with xfs_ail_min() which has already been simplified
via list_first_entry_or_null().

Moreover, as a per simple grep against fs as well as driver's tree,
I think there are some other places could make use of it for similar
purpose, here I spread this helper over some file systems as well.

Any comments are welcome!

Thanks,
-Jeff

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