Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758134Ab3EGIM4 (ORCPT ); Tue, 7 May 2013 04:12:56 -0400 Received: from LGEMRELSE1Q.lge.com ([156.147.1.111]:42317 "EHLO LGEMRELSE1Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757811Ab3EGIMv (ORCPT ); Tue, 7 May 2013 04:12:51 -0400 X-AuditID: 9c93016f-b7ba0ae000004cc2-af-5188b77ebd2d From: Chanho Min To: Andrew Morton Cc: Kyungsik Lee , Yann Collet , Bob Pearson , Richard Weinberger , Geert Uytterhoeven , linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-m68k@vger.kernel.org, linux-next@vger.kernel.org, Chanho Min Subject: [PATCH RESEND] lib: add weak clz/ctz functions Date: Tue, 7 May 2013 17:12:37 +0900 Message-Id: <1367914357-1876-1-git-send-email-chanho.min@lge.com> X-Mailer: git-send-email 1.7.9.5 X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2594 Lines: 98 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 Signed-off-by: Chanho Min --- 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 + * + * 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 +#include + +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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/