[PATCH 0/3] thp: tidy and fix khugepaged_prealloc_page

[Xiao Guangrong]

There has a bug in khugepaged_prealloc_page, the page-alloc
indicator is not reset if the previous page request is failed,
then it will trigger the VM_BUG_ON in khugepaged_alloc_page.
It is fixed by the first patch which need not be back port for
it was introduced by recent commit. (sorry for that)

As Hugh pointed out, this are some ugly portions:
- releasing mmap_sem lock is hidden in khugepaged_alloc_page
- page is freed in khugepaged_prealloc_page
The later two patches try to fix these issues.

Hugh,

If any point i missed, please let me know, and sorry to waste
your time on my broken patch.

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