[parisc-linux] stalling system clues + parisc WCHAN hack

[Paul Bame]

False alarm.

I can only reproduce this on a B2000.  C3000 grunted through the
test load and did not get semi-permanently upset like the B2000.  I
tried an A500 with pa8600 cpu (as has B2000) and it was ok.  B180
is fine too.

After a fresh boot, it took 20+ *minutes* to untar a kernel tree,
use dd to make 3 32Mb files, and 'cp -a' the linux tree, with almost
all the time spent in the 'cp -a' (WCHAN 'wait_on_buffer').  All the
I/O is to a 63G ext3 partition on a decent SCSI disk.  dmesg isn't
complaining (e.g., apparently no scsi timeouts).  There are no other
loads on the CPU other than normal idle daemons.  There's plenty of
free memory remaining.  CPU is normally 99% idle according to top.

Gaak

	-P