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From: Wu Fengguang on 30 Jan 2010 05:00
This allows use of hweight_long() in BUILD_BUG_ON().
Suggested by Jamie.

CC: Jamie Lokier <jamie(a)shareable.org>
CC: Roland Dreier <rdreier(a)cisco.com>
Signed-off-by: Wu Fengguang <fengguang.wu(a)intel.com>
---
include/linux/bitops.h | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)

--- linux-mm.orig/include/linux/bitops.h 2009-07-20 20:10:19.000000000 +0800
+++ linux-mm/include/linux/bitops.h 2010-01-30 17:41:15.000000000 +0800
@@ -40,10 +40,14 @@ static __inline__ int get_count_order(un
return order;
}

-static inline unsigned long hweight_long(unsigned long w)
-{
- return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
-}
+#define hweight_long(x) \
+( \
+ __builtin_constant_p(x) ? \
+ __builtin_popcountl(x) : \
+ (sizeof(x) <= 4 ? \
+ hweight32(x) : \
+ hweight64(x)) \
+)

/**
* rol32 - rotate a 32-bit value left


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