The patch titled
Subject: lib: add weak __clzsi2()/__clzdi2() functions
has been added to the -mm tree. Its filename is
lib-add-weak-__clzsi2-__clzdi2-functions.patch
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------------------------------------------------------
From: Chanho Min <chanho.min@xxxxxxx>
Subject: lib: add weak __clzsi2()/__clzdi2() functions
Some architectures need __clzsi2() or __clzdi2() for __builtin_clz and It
causes build failure. They can be implemented using the fls() and
overridden by linking arch-specific versions may not be implemented yet.
Needed by the forthcoming lz4 decompressor patches.
See https://lkml.org/lkml/2013/4/18/603
Signed-off-by: Chanho Min <chanho.min@xxxxxxx>
Reported-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Acked-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Makefile | 2 +-
lib/clz.c | 36 ++++++++++++++++++++++++++++++++++++
2 files changed, 37 insertions(+), 1 deletion(-)
diff -puN lib/Makefile~lib-add-weak-__clzsi2-__clzdi2-functions lib/Makefile
--- a/lib/Makefile~lib-add-weak-__clzsi2-__clzdi2-functions
+++ a/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.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 -puN /dev/null lib/clz.c
--- /dev/null
+++ a/lib/clz.c
@@ -0,0 +1,36 @@
+/*
+ * lib/clz.c
+ *
+ * Copyright (C) 2013 Chanho Min <chanho.min@xxxxxxx>
+ *
+ * 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.
+ *
+ * __clzsi2/_clzdi2() can be overridden by linking arch-specific versions.
+ */
+
+#include <linux/export.h>
+#include <linux/kernel.h>
+
+int __weak __clzsi2(int val)
+{
+ return BITS_PER_LONG - fls(val);
+}
+EXPORT_SYMBOL(__clzsi2);
+
+#if BITS_PER_LONG == 32
+int __weak __clzdi2(long val)
+{
+ return BITS_PER_LONG - fls((int)val);
+}
+EXPORT_SYMBOL(__clzdi2);
+#elif BITS_PER_LONG == 64
+int __weak __clzdi2i(long val)
+{
+ return BITS_PER_LONG - fls64((u64)val);
+}
+EXPORT_SYMBOL(__clzdi2);
+#else
+#error BITS_PER_LONG not 32 or 64
+#endif
_
Patches currently in -mm which might be from chanho.min@xxxxxxx are
origin.patch
lib-add-weak-__clzsi2-__clzdi2-functions.patch
lib-add-weak-__clzsi2-__clzdi2-functions-fix.patch
lib-add-lz4-compressor-module.patch
lib-add-lz4-compressor-module-fix.patch
crypto-add-lz4-cryptographic-api.patch
crypto-add-lz4-cryptographic-api-fix.patch
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