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-rw-r--r--include/linux/idr.h15
1 files changed, 7 insertions, 8 deletions
diff --git a/include/linux/idr.h b/include/linux/idr.h
index 63aa542da49b..43b87b1c77a3 100644
--- a/include/linux/idr.h
+++ b/include/linux/idr.h
@@ -17,14 +17,13 @@
#include <linux/init.h>
#include <linux/rcupdate.h>
-#if BITS_PER_LONG == 32
-# define IDR_BITS 5
-#elif BITS_PER_LONG == 64
-# define IDR_BITS 6
-#else
-# error "BITS_PER_LONG is not 32 or 64"
-#endif
-
+/*
+ * We want shallower trees and thus more bits covered at each layer. 8
+ * bits gives us large enough first layer for most use cases and maximum
+ * tree depth of 4. Each idr_layer is slightly larger than 2k on 64bit and
+ * 1k on 32bit.
+ */
+#define IDR_BITS 8
#define IDR_SIZE (1 << IDR_BITS)
#define IDR_MASK ((1 << IDR_BITS)-1)

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