2.6.26 (x86 vs. x86_64) different /sys directory structure for md?

Have two hosts, an (md) raid5 on each:

Linux p26 2.6.26 #2 SMP Sat Jul 26 13:23:40 EDT 2008 i686 GNU/Linux
Linux p63 2.6.26 #2 SMP Sat Jul 26 08:21:07 EDT 2008 x86_64 GNU/Linux

Was going to run a check on my raids:

echo check > sync_action

I noticed:

For x86 (Debian Testing), the path to sync_action is:
/sys/block/md0/md/sync_action

For x86_64 (Debian Testing), the path to sync_action is:
/sys/devices/virtual/block/md0/md/sync_action

p26:/dev# find /sys/|grep -i sync_action
/sys/block/md0/md/sync_action
p26:/dev#

p63:~# find /sys/|grep -i sync_action
/sys/devices/virtual/block/md0/md/sync_action
/sys/devices/virtual/block/md3/md/sync_action
/sys/devices/virtual/block/md2/md/sync_action
/sys/devices/virtual/block/md1/md/sync_action
p63:~#

The kernels are compiled similarly in terms of overall configuration, I will need to take this into account for scripting array checks etc, but I was curious why are they different between architectures and is it going to change in the future?  Should one take the path to sync_action with a grain of salt?  Or do I have an incorrect configuration option specified somewhere that had made this occur?

http://home.comcast.net/~jpiszcz/20080831/p26-config.txt
http://home.comcast.net/~jpiszcz/20080831/p63-config.txt

Justin.