1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/include/asm-generic/bitops/builtin-fls.h b/kernel/include/asm-generic/bitops/builtin-fls.h
new file mode 100644
index 000000000..eda652d0a
--- /dev/null
+++ b/kernel/include/asm-generic/bitops/builtin-fls.h
@@ -0,0 +1,16 @@
+#ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
+#define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
+
+/**
+ * fls - find last (most-significant) bit set
+ * @x: the word to search
+ *
+ * This is defined the same way as ffs.
+ * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
+ */
+static __always_inline int fls(int x)
+{
+	return x ? sizeof(x) * 8 - __builtin_clz(x) : 0;
+}
+
+#endif