IDR now exposes the XArray lock to users, and relies on the xa_* macros
defined in xarray.h. Include this header in idr.h.

Fixes: 3c60e868c31e ("IDR: Expose the XArray lock")
Signed-off-by: Jean-Philippe Brucker <jean-philippe.bruc...@arm.com>
---
 include/linux/idr.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/idr.h b/include/linux/idr.h
index 3ec8628ce17f..3b835bf492ab 100644
--- a/include/linux/idr.h
+++ b/include/linux/idr.h
@@ -15,6 +15,7 @@
 #include <linux/radix-tree.h>
 #include <linux/gfp.h>
 #include <linux/percpu.h>
+#include <linux/xarray.h>
 
 struct idr {
        struct radix_tree_root  idr_rt;
-- 
2.18.0

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