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Subject[PATCH] perf tools: Prevent from BITS_PER_LONG redefinition
The system asm/types.h may have defined BITS_PER_LONG already,
depending on the distro.

Check that before defining it from bitops.h wrapper.


In file included from util/include/../../../../include/linux/bitops.h:17,
from util/include/linux/bitops.h:8,
from ../../lib/hweight.c:2:
util/include/asm/bitops.h:9:1: error: "BITS_PER_LONG" redefined
In file included from util/include/../../../../include/linux/bitops.h:3,
from util/include/linux/bitops.h:8,
from ../../lib/hweight.c:2:
/usr/include/asm/types.h:32:1: error: this is the location of the previous definition
make: *** [util/hweight.o] Erreur 1

Signed-off-by: Frederic Weisbecker <>
Cc: Peter Zijlstra <>
Cc: Arnaldo Carvalho de Melo <>
Cc: Paul Mackerras <>
tools/perf/util/include/asm/bitops.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/include/asm/bitops.h b/tools/perf/util/include/asm/bitops.h
index 58e9817..d945334 100644
--- a/tools/perf/util/include/asm/bitops.h
+++ b/tools/perf/util/include/asm/bitops.h
@@ -5,8 +5,10 @@
#include "../../types.h"
#include <linux/compiler.h>

+#ifndef BITS_PER_LONG
/* CHECKME: Not sure both always match */

#include "../../../../include/asm-generic/bitops/__fls.h"
#include "../../../../include/asm-generic/bitops/fls.h"

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