[PATCH v5 04/23] xen/asm-generic: introduce generic fls() and flsl() functions

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

These functions can be useful for architectures that don't
have corresponding arch-specific instructions.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 Changes in V5:
   - new patch
---
 xen/include/asm-generic/bitops/fls.h  | 18 ++++++++++++++++++
 xen/include/asm-generic/bitops/flsl.h | 10 ++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 xen/include/asm-generic/bitops/fls.h
 create mode 100644 xen/include/asm-generic/bitops/flsl.h

diff --git a/xen/include/asm-generic/bitops/fls.h 
b/xen/include/asm-generic/bitops/fls.h
new file mode 100644
index 0000000000..369a4c790c
--- /dev/null
+++ b/xen/include/asm-generic/bitops/fls.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_GENERIC_BITOPS_FLS_H_
+#define _ASM_GENERIC_BITOPS_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 inline int fls(unsigned int x)
+{
+    return generic_fls(x);
+}
+
+#endif /* _ASM_GENERIC_BITOPS_FLS_H_ */
diff --git a/xen/include/asm-generic/bitops/flsl.h 
b/xen/include/asm-generic/bitops/flsl.h
new file mode 100644
index 0000000000..d0a2e9c729
--- /dev/null
+++ b/xen/include/asm-generic/bitops/flsl.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_GENERIC_BITOPS_FLSL_H_
+#define _ASM_GENERIC_BITOPS_FLSL_H_
+
+static inline int flsl(unsigned long x)
+{
+    return generic_flsl(x);
+}
+
+#endif /* _ASM_GENERIC_BITOPS_FLSL_H_ */
-- 
2.43.0