[PATCH 3/12] generic ffz()

From: Akinobu Mita <mita_at_miraclelinux.com>
Date: 2006-01-26 14:31:56
This patch introduces the C-language equivalent of the function:
unsigned long ffz(unsigned long word);

HAVE_ARCH_FFZ_BITOPS is defined when the architecture has its own
version of these functions.

This code largely copied from:
include/asm-sparc64/bitops.h


Index: 2.6-git/include/asm-generic/bitops.h
===================================================================
--- 2.6-git.orig/include/asm-generic/bitops.h	2006-01-25 19:14:09.000000000 +0900
+++ 2.6-git/include/asm-generic/bitops.h	2006-01-25 19:14:10.000000000 +0900
@@ -230,6 +230,13 @@
 
 #endif /* HAVE_ARCH___FFS_BITOPS */
 
+#ifndef HAVE_ARCH_FFZ_BITOPS
+
+/* Undefined if no bit is zero. */
+#define ffz(x)	__ffs(~x)
+
+#endif /* HAVE_ARCH_FFZ_BITOPS */
+
 /*
  * fls: find last bit set.
  */
-
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Received on Thu Jan 26 14:32:57 2006

This archive was generated by hypermail 2.1.8 : 2006-01-26 14:33:06 EST