[patch 08/44] generic ffz()

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 <[email protected]>
 include/asm-generic/bitops/ffz.h |   12 ++++++++++++
 1 files changed, 12 insertions(+)

Index: 2.6-git/include/asm-generic/bitops/ffz.h
===================================================================
--- /dev/null
+++ 2.6-git/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_ */

--
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---

• References:
  • [patch 00/44] generic bitops
    • From: Akinobu Mita <[email protected]>

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