From: Akinobu Mita <mita@miraclelinux.com>
To: linux-kernel@vger.kernel.org
Cc: akpm@osdl.org, Russell King <rmk@arm.linux.org.uk>,
Ian Molton <spyro@f2s.com>, David Howells <dhowells@redhat.com>,
Hirokazu Takata <takata@linux-m32r.org>,
Greg Ungerer <gerg@uclinux.org>,
linux-mips@linux-mips.org, parisc-linux@parisc-linux.org,
sparclinux@vger.kernel.org, ultralinux@vger.kernel.org,
Miles Bader <uclinux-v850@lsi.nec.co.jp>,
Akinobu Mita <mita@miraclelinux.com>
Subject: [patch 09/47] generic ffz()
Date: Tue, 14 Feb 2006 14:04:00 +0900 [thread overview]
Message-ID: <20060214050443.468528000@localhost.localdomain> (raw)
In-Reply-To: 20060214050351.252615000@localhost.localdomain
[-- Attachment #1: ffz-bitops.patch --]
[-- Type: text/plain, Size: 836 bytes --]
This patch introduces the C-language equivalent of the function:
unsigned long ffz(unsigned long word);
In include/asm-generic/bitops/ffz.h
This code largely copied from:
include/asm-parisc/bitops.h
Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
include/asm-generic/bitops/ffz.h | 12 ++++++++++++
1 files changed, 12 insertions(+)
Index: 2.6-rc/include/asm-generic/bitops/ffz.h
===================================================================
--- /dev/null
+++ 2.6-rc/include/asm-generic/bitops/ffz.h
@@ -0,0 +1,12 @@
+#ifndef _ASM_GENERIC_BITOPS_FFZ_H_
+#define _ASM_GENERIC_BITOPS_FFZ_H_
+
+/*
+ * ffz - find first zero in word.
+ * @word: The word to search
+ *
+ * Undefined if no zero exists, so code should check against ~0UL first.
+ */
+#define ffz(x) __ffs(~(x))
+
+#endif /* _ASM_GENERIC_BITOPS_FFZ_H_ */
--
next prev parent reply other threads:[~2006-02-14 5:02 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20060214050351.252615000@localhost.localdomain>
2006-02-14 5:03 ` [patch 05/47] use non atomic operations for minix_*_bit() and ext2_*_bit() Akinobu Mita
2006-02-14 5:03 ` [patch 07/47] generic __{,test_and_}{set,clear,change}_bit() and test_bit() Akinobu Mita
2006-02-14 5:03 ` [patch 08/47] generic __ffs() Akinobu Mita
2006-02-14 5:04 ` Akinobu Mita [this message]
2006-02-14 5:04 ` [patch 10/47] generic fls() Akinobu Mita
2006-02-14 5:04 ` [patch 11/47] generic fls64() Akinobu Mita
2006-02-14 5:04 ` [patch 12/47] generic find_{next,first}{,_zero}_bit() Akinobu Mita
2006-02-14 5:04 ` [patch 13/47] generic sched_find_first_bit() Akinobu Mita
2006-02-14 5:04 ` [patch 14/47] generic ffs() Akinobu Mita
2006-02-14 5:04 ` [patch 15/47] generic hweight{64,32,16,8}() Akinobu Mita
2006-02-14 5:04 ` [patch 16/47] generic ext2_{set,clear,test,find_first_zero,find_next_zero}_bit() Akinobu Mita
2006-02-14 5:04 ` [patch 17/47] generic ext2_{set,clear}_bit_atomic() Akinobu Mita
2006-02-14 5:04 ` [patch 18/47] generic minix_{test,set,test_and_clear,test,find_first_zero}_bit() Akinobu Mita
2006-02-14 5:04 ` [patch 30/47] mips: use generic bitops Akinobu Mita
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