linux-next: build failure after merge of the mm tree

[Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>]

Hi all,

After merging the mm tree, today's linux-next build (various) failed
like this:

mm/khugepaged.c:1702:9: error: implicit declaration of function ‘vma_try_start_write’; did you mean ‘vma_start_write’? [-Werror=implicit-function-declaration]

Caused by commit

  92e3612279f9 ("mm/khugepaged: fix vm_lock/i_mmap_rwsem inversion in retract_page_tables")

The definition of vma_try_start_write() is protected by
CONFIG_PER_VMA_LOCK, but its use is not.

-- 
Cheers,
Stephen Rothwell

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