On 02/11/2016 06:21 AM, Kirill A. Shutemov wrote:

vma_addjust_trans_huge() splits pmd if it's crossing VMA boundary.
During split we munlock the huge page which requires rmap walk.
rmap wants to take the lock on its own.

Ahhh, ... so we $SUBJECT in order to fix it.

Now it all makes sense.  Maybe I'm old fashioned, but I tend to have
forgotten $SUBJECT by the time I start to read the patch body text.
It's really handy for me when the body text stands on its own.

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