Some architectures need __c[lt]z[sd]i2() for __builtin_c[lt]z[ll] and
It causes build failure. They can be implemented using the fls()/__ffs() and
overridden by linking arch-specific versions may not be implemented yet.
Reference: https://lkml.org/lkml/2013/4/18/603
Reported-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Chanho Min <[email protected]>
---
lib/Makefile | 2 +-
lib/clz_ctz.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 59 insertions(+), 1 deletion(-)
create mode 100644 lib/clz_ctz.c
diff --git a/lib/Makefile b/lib/Makefile
index af79e8c..3eacb2c 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -23,7 +23,7 @@ lib-y += kobject.o klist.o
obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
- gcd.o lcm.o list_sort.o uuid.o flex_array.o \
+ gcd.o lcm.o list_sort.o uuid.o flex_array.o clz_ctz.o\
bsearch.o find_last_bit.o find_next_bit.o llist.o memweight.o kfifo.o
obj-y += string_helpers.o
obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o
diff --git a/lib/clz_ctz.c b/lib/clz_ctz.c
new file mode 100644
index 0000000..a8f8379
--- /dev/null
+++ b/lib/clz_ctz.c
@@ -0,0 +1,58 @@
+/*
+ * lib/clz_ctz.c
+ *
+ * Copyright (C) 2013 Chanho Min <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * __c[lt]z[sd]i2 can be overridden by linking arch-specific versions.
+ */
+
+#include <linux/export.h>
+#include <linux/kernel.h>
+
+int __weak __ctzsi2(int val)
+{
+ return __ffs(val);
+}
+EXPORT_SYMBOL(__ctzsi2);
+
+int __weak __clzsi2(int val)
+{
+ return 32 - fls(val);
+}
+EXPORT_SYMBOL(__clzsi2);
+
+#if BITS_PER_LONG == 32
+
+int __weak __clzdi2(long val)
+{
+ return 32 - fls((int)val);
+}
+EXPORT_SYMBOL(__clzdi2);
+
+int __weak __ctzdi2(long val)
+{
+ return __ffs((u32)val);
+}
+EXPORT_SYMBOL(__ctzdi2);
+
+#elif BITS_PER_LONG == 64
+
+int __weak __clzdi2(long val)
+{
+ return 64 - fls64((u64)val);
+}
+EXPORT_SYMBOL(__clzdi2);
+
+int __weak __ctzdi2(long val)
+{
+ return __ffs64((u64)val);
+}
+EXPORT_SYMBOL(__ctzdi2);
+
+#else
+#error BITS_PER_LONG not 32 or 64
+#endif
--
1.7.9.5