Matthew Wilcox d9c480435a XArray: Handle NULL pointers differently for allocation ...

For allocating XArrays, it makes sense to distinguish beteen erasing an
entry and storing NULL.  Storing NULL keeps the index allocated with a
NULL pointer associated with it while xa_erase() frees the index.  Some
existing IDR users rely on this ability.

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

2018-11-05 16:38:09 -05:00

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