From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Thu, 28 Sep 2006 14:55:39 +0000 (+0200)
Subject: [S390] __div64_32 for 31 bit.
X-Git-Tag: v2.6.19-rc1~892
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9f7a745d55527d0d41684b22506a86c4381f7f1;p=pandora-kernel.git

[S390] __div64_32 for 31 bit.

The clocksource infrastructure introduced with commit
ad596171ed635c51a9eef829187af100cbf8dcf7 broke 31 bit s390.
The reason is that the do_div() primitive for 31 bit always
had a restriction: it could only divide an unsigned 64 bit
integer by an unsigned 31 bit integer. The clocksource code
now uses do_div() with a base value that has the most
significant bit set. The result is that clock->cycle_interval
has a funny value which causes the linux time to jump around
like mad.
The solution is "obvious": implement a proper __div64_32
function for 31 bit s390.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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