From: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Date: Sat, 26 Jan 2008 13:10:48 +0000 (+0100)
Subject: [S390] cio: reduce cpu utilization during device scan
X-Git-Tag: v2.6.25-rc1~1228^2~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e82a1567e4b22eb035da2499d20ddd573c9acf75;p=pandora-kernel.git

[S390] cio: reduce cpu utilization during device scan

Minimize calls to cpu intensive function get_subchannel_by_schid()
by introducing function for_each_subchannel_staged() which
temporarily caches the information about registered subchannels
in a bitmap.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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