Boot failure with block/for-next

[James Bottomley]

Trying to test out the SCSI post merge tree, I've found it won't boot on
my SCSI test system.  The reason is a failure to read the partition
table of the root disc.  It just gives

sda: unable to read partition table

The other four discs in the system seem to read their partition tables
OK.

The obvious candidate is the partition code rework in block/for-next.
Simply reverting 

commit d2bf1b6723ed0eab378363649d15b7893bf14e91
Author: Tejun Heo <tj@xxxxxxxxxx>
Date:   Wed Dec 8 20:57:36 2010 +0100

    block: move register_disk() and del_gendisk() to block/genhd.c
 
Doesn't fix the boot failure, so it's obviously something deeper.

James


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