[parisc-linux] backport bitops.h stuff

[Joel Soete]

Hi pa,

Can somebody help me to ci inot 2.4 this patch which backport ffs() needed
for new devmapper ;)

--- bitops.h.orig	2003-08-01 15:25:02.000000000 +0200
+++ bitops.h	2003-08-01 15:27:38.000000000 +0200
@@ -208,13 +208,34 @@
 
 #ifdef __KERNEL__
 
+/**
+ * __ffs - find first bit in word.
+ * @word: The word to search
+ *
+ * Undefined if no bit exists, so code should check against 0 first.
+ */
+static __inline__ unsigned long __ffs(unsigned long word)
+{
+	unsigned long result = 0;
+
+	while (!(word & 1UL)) {
+		result++;
+		word >>= 1;
+	}
+	return result;
+}
+
 /*
  * ffs: find first bit set. This is defined the same way as
  * the libc and compiler builtin ffs routines, therefore
  * differs in spirit from the above ffz (man ffs).
  */
-
-#define ffs(x) generic_ffs(x)
+static __inline__ int ffs(int x)
+{
+	if (!x)
+		return 0;
+	return __ffs((unsigned long)x);
+}
 
 /*
  * hweightN: returns the hamming weight (i.e. the number

Thanks in advance,
    Joel


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