CPU hotplug broken with 2GB VMSPLIT

[Jens Axboe <jens.axboe@oracle.com>]

Hi,

Just got a new notebook (Lenovo X60), setup a custom kernel and then I
noticed that suspend to ram doesn't work anymore. The machine suspends
just fine, on resume it brings back the text display but reboots after
it has stalled for a few seconds. On the suggestion of Pavel, I tried
testing CPU hotplug, and indeed he was right: I can offline 1 of the
cores fine, bringing it back online freezes the machine for 3-4 seconds
and then reboots.

carl:/sys/devices/system/cpu/cpu1 # echo 0 > online 
carl:/sys/devices/system/cpu/cpu1 # dmesg
Breaking affinity for irq 219
CPU 1 is now offline
SMP alternatives: switching to UP code
carl:/sys/devices/system/cpu/cpu1 # echo 1 > online 
Read from remote host carl: Connection reset by peer

Booting with maxcpus=1 and resume works fine. Does this ring a bell with
anyone? With highmem enabled and the standard vmsplit, cpu hotplug works
fine for me.

-- 
Jens Axboe

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