[dm-devel] 2.6.25-rc1 patch prevents booting on LVM-based devices

[Chuck Lever]

Hello-

I've got a Fedora 8 x86 test system that uses LVM volumes for all  
it's file systems except /boot.  After commit bdc80787, 2.6.24+  
doesn't boot on this system -- the LVM volume scan during start-up  
can no longer find any physical volumes on the system.

I'm not sure whether this is an LVM issue, or something else is  
breaking during system init which prevents the LVM scan from  
working.  I need some help troubleshooting the problem.

bdc80787 is:

commit bdc807871d58285737d50dc6163d0feb72cb0dc2
Author: H. Peter Anvin <hpa at zytor.com>
Date:   Fri Feb 8 04:21:26 2008 -0800

     avoid overflows in kernel/time.c

     When the conversion factor between jiffies and milli- or  
microseconds is
     not a single multiply or divide, as for the case of HZ == 300,  
we currently
     do a multiply followed by a divide.  The intervening result,  
however, is
     subject to overflows, especially since the fraction is not  
simplified (for
     HZ == 300, we multiply by 300 and divide by 1000).

     This is exposed to the user when passing a large timeout to poll 
(), for
     example.

     This patch replaces the multiply-divide with a reciprocal  
multiplication on
     32-bit platforms.  When the input is an unsigned long, there is  
no portable
     way to do this on 64-bit platforms there is no portable way to  
do this
     since it requires a 128-bit intermediate result (which gcc does  
support on
     64-bit platforms but may generate libgcc calls, e.g.  on 64-bit  
s390), but
     since the output is a 32-bit integer in the cases affected, just  
simplify
     the multiply-divide (*3/10 instead of *300/1000).

and so on...

--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com