Commit 35ce7f29a breaks hibernation for XPS 13

[Eric B Munson]

Paul,

As of 3.18-rc1 I can no longer hibernate my Dell XPS-13.  Bisect points
the finger at 35ce7f29a.  A revert of that commit confirms, I can once
again hibernate my machine without it.

When the hibernation fails I see this in dmesg:
[   37.953313] PM: Syncing filesystems ... done.
[   37.963694] Freezing user space processes ... (elapsed 0.001 seconds) done.
[   37.965297] PM: Marking nosave pages: [mem 0x00000000-0x00000fff]
[   37.965299] PM: Marking nosave pages: [mem 0x00058000-0x00058fff]
[   37.965301] PM: Marking nosave pages: [mem 0x0009d000-0x000fffff]
[   37.965304] PM: Marking nosave pages: [mem 0xc496a000-0xc4b6bfff]
[   37.965315] PM: Marking nosave pages: [mem 0xdadb7000-0xdcffefff]
[   37.965479] PM: Marking nosave pages: [mem 0xdd000000-0xffffffff]
[   37.966000] PM: Basic memory bitmaps created
[   37.966046] PM: Preallocating image memory... done (allocated 181989 pages)
[   38.141524] PM: Allocated 727956 kbytes in 0.17 seconds (4282.09 MB/s)
[   38.141525] Freezing remaining freezable tasks ... 
[   58.151863] Freezing of tasks failed after 20.004 seconds (0 tasks refusing to freeze, wq_busy=1):
[   58.151894] 
[   58.151896] Restarting kernel threads ... done.
[   58.181915] PM: Basic memory bitmaps freed
[   58.181917] Restarting tasks ... done.


I am not sure what else I can provide that might be useful, but I did
see the thread on net-dev about this same commit.  Please CC me on any
fixes and I will be happy to test.

Eric
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