The patch titled Subject: lib: add weak clz/ctz functions has been added to the -mm tree. Its filename is lib-add-weak-clz-ctz-functions.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Chanho Min <chanho.min@xxxxxxx> Subject: lib: add weak clz/ctz functions 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. This is required by "lib: add lz4 compressor module". Reference: https://lkml.org/lkml/2013/4/18/603 Signed-off-by: Chanho Min <chanho.min@xxxxxxx> Reported-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> Cc: "Darrick J. Wong" <djwong@xxxxxxxxxx> Cc: Bob Pearson <rpearson@xxxxxxxxxxxxxxxxxxxxx> Cc: Richard Weinberger <richard@xxxxxx> Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxxx> Cc: Yann Collet <yann.collet.73@xxxxxxxxx> Cc: Kyungsik Lee <kyungsik.lee@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/Makefile | 2 - lib/clz_ctz.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 59 insertions(+), 1 deletion(-) diff -puN lib/Makefile~lib-add-weak-clz-ctz-functions lib/Makefile --- a/lib/Makefile~lib-add-weak-clz-ctz-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_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 -puN /dev/null lib/clz_ctz.c --- /dev/null +++ a/lib/clz_ctz.c @@ -0,0 +1,58 @@ +/* + * lib/clz_ctz.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. + * + * __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 _ Patches currently in -mm which might be from chanho.min@xxxxxxx are origin.patch lib-add-weak-clz-ctz-functions.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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html