[PATCH 0/9 V2] idr: fix & cleanup

[Lai Jiangshan <laijs@cn.fujitsu.com>]

Patch1 fix a bug caused by overflow.
Patch2,3 add checks for unallocated_id.
Patch4 changes to returned error code
Patch5-9 cleanup.


Lai Jiangshan (9):
  idr: fix overflow bug during maximum ID calculation at maximum height
  idr: fix unexpected ID-removal when idr_remove(unallocated_id)
**^^also consider ida_remove()
  idr: fix NULL pointer dereference when ida_remove(unallocated_id)
  idr: fix idr_replace()'s returned error code
  idr: covert BUG_ON() to WARN_ON_ONCE() if the argument is invalid.
**^^move the test into ida_remove() as tj suggested.
  idr: avoid ping-pong
  idr: don't need to shink the free list when idr_remove()
**^^split
  idr: reduce the unneeded check in free_layer()
  idr: remove useless C-PreProcessor branch
**^^new

 lib/idr.c |   66 +++++++++++++++++++++---------------------------------------
 1 files changed, 23 insertions(+), 43 deletions(-)

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1.7.4.4