Re: undefined reference to `__ffs'

["Brian T" <btuch@usa.net>]

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> On Fri, 2004-08-27 at 20:04, Brian T wrote:
> > So MTD is no longer compatable with the current 2.4 tree?  I just
unpacked
> > it and didn't see it in linux/asm-i386/bitops.h .  Am I looking in the
wrong
> > place?
>
> __ffs was never in 2.4. Move to 2.6 or add it to compatmac.h and provide
> a nice patch, if you really want to hang on with 2.4
>
> tglx

compatmac.h patch attached for __ffs() .

Compiles against 2.4.27 now.  Hope I didn't break anything.

-Brian

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--- include/linux/mtd/compatmac.h.orig	Mon Aug 30 09:17:28 2004
+++ include/linux/mtd/compatmac.h	Mon Aug 30 11:22:18 2004
@@ -64,6 +64,22 @@
 
 #include <linux/sched.h>
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+/**
+ *   * __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)
+{
+	__asm__("bsfl %1,%0"
+	:"=r" (word)
+	:"rm" (word));
+	return word;
+}
+#endif /* < 2.5.0 */
+
 #ifdef __rh_config_h__
 #define sigmask_lock sighand->siglock
 #define sig sighand