From: Tejun Heo <htejun@gmail.com>
Date: Wed, 13 Jun 2007 18:45:18 +0000 (+0900)
Subject: sysfs: use singly-linked list for sysfs_dirent tree
X-Git-Tag: v2.6.23-rc1~1107^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0c73f18b7d95de8a007039337063a770b5fc8e7a;p=pandora-kernel.git

sysfs: use singly-linked list for sysfs_dirent tree

Make sysfs_dirent use singly linked list for its tree structure.
sysfs_link_sibling() and sysfs_unlink_sibling() functions are added to
handle simpler cases.  It adds some complexity and cpu cycle overhead
but reduced memory footprint is worthwhile on big machines.

This change reduces the sizeof sysfs_dirent from 104 to 88 on 64bit
and from 60 to 52 on 32bit.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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