Sleeping BUG in khugepaged for i586

[Larry Finger]

I recently turned on locking diagnostics for a Dell Latitude D600 laptop, which 
requires a 32-bit kernel. In the log I found the following:

BUG: sleeping function called from invalid context at mm/khugepaged.c:655
in_atomic(): 1, irqs_disabled(): 0, pid: 20, name: khugepaged
1 lock held by khugepaged/20:
 #0:  (&mm->mmap_sem){++++++}, at: [<c03d6609>] 
collapse_huge_page.isra.47+0x439/0x1240
CPU: 0 PID: 20 Comm: khugepaged Tainted: G        W 
4.12.0-rc1-wl-12125-g952a068 #80
Hardware name: Dell Computer Corporation Latitude D600 
/03U652, BIOS A05 05/29/2003
Call Trace:
 dump_stack+0x76/0xb2
 ___might_sleep+0x174/0x230
 collapse_huge_page.isra.47+0xacf/0x1240
 khugepaged_scan_mm_slot+0x41e/0xc00
 ? _raw_spin_lock+0x46/0x50
 khugepaged+0x277/0x4f0
 ? prepare_to_wait_event+0xe0/0xe0
 kthread+0xeb/0x120
 ? khugepaged_scan_mm_slot+0xc00/0xc00
 ? kthread_create_on_node+0x30/0x30
 ret_from_fork+0x21/0x30

I have no idea when this problem was introduced. Of course, I will test any 
proposed fixes.

Thanks,

Larry