Merge branch 'idr-fix-overflow-cases-on-32-bit-CPU'

Merge branch 'idr-fix-overflow-cases-on-32-bit-CPU'

Cong Wang says:

====================
idr: fix overflow cases on 32-bit CPU

idr_get_next_ul() is problematic by design, it can't handle
the following overflow case well on 32-bit CPU:

u32 id = UINT_MAX;
idr_alloc_u32(&id);
while (idr_get_next_ul(&id) != NULL)
 id++;

when 'id' overflows and becomes 0 after UINT_MAX, the loop
goes infinite.

Fix this by eliminating external users of idr_get_next_ul()
and migrating them to idr_for_each_entry_continue_ul(). And
add an additional parameter for these iteration macros to detect
overflow properly.

Please merge this through networking tree, as all the users
are in networking subsystem.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>