Readd the arch ffz functions
May as well use the single op version if we have them, it's
generally a lot faster than the generic_ffz()
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/arch/arch-ppc.h b/arch/arch-ppc.h
index 4d77105..6256d05 100644
--- a/arch/arch-ppc.h
+++ b/arch/arch-ppc.h
@@ -28,4 +28,20 @@
__asm__ __volatile__ ("sync" : : : "memory")
#endif
+static inline int __ilog2(unsigned long bitmask)
+{
+ int lz;
+
+ asm ("cntlzw %0,%1" : "=r" (lz) : "r" (bitmask));
+ return 31 - lz;
+}
+
+static inline int arch_ffz(unsigned long bitmask)
+{
+ if ((bitmask = ~bitmask) == 0)
+ return 32;
+ return __ilog2(bitmask & -bitmask);
+}
+#define ARCH_HAVE_FFZ
+
#endif