MFC r282331:

MFC r282331:
Don't drop the idr lock before verifying that the newly-inserted element
is present in the tree.

MFC r282741:
find_next_bit() and find_next_zero_bit(): if the caller-specified offset
lies within the last block of the bit set and no bits are set beyond the
offset, terminate the search immediately instead of continuing as though
there are further blocks in the set and subsequently returning an incorrect
result.

MFC r282743:
Ensure that msecs_to_jiffies(0) == 0.

git-svn-id: svn://svn.freebsd.org/base/stable/10@283675 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f