tree ad246f964d28e84a4c18c0cae666bb434b30b873
parent 50d97d50715a8664f6bddc18211279cd74b8c3bf
author Matthew Wilcox <willy@infradead.org> 1521580031 -0400
committer Matthew Wilcox <willy@infradead.org> 1534910053 -0400

ida: Add new API

Add ida_alloc(), ida_alloc_min(), ida_alloc_max(), ida_alloc_range()
and ida_free().  The ida_alloc_max() and ida_alloc_range() functions
differ from ida_simple_get() in that they take an inclusive 'max'
parameter instead of an exclusive 'end' parameter.  Callers are about
evenly split whether they'd like inclusive or exclusive parameters and
'max' is easier to document than 'end'.

Change the IDA allocation to first attempt to allocate a bit using
existing memory, and only allocate memory afterwards.  Also change the
behaviour of 'min' > INT_MAX from being a BUG() to returning -ENOSPC.

Leave compatibility wrappers in place for ida_simple_get() and
ida_simple_remove() to avoid changing all callers.

Signed-off-by: Matthew Wilcox <willy@infradead.org>