Enable architectures, such as s390, which store SFrame CFA offset values
encoded, to e.g. make (better) use of unsigned 8-bit SFrame offsets.

Signed-off-by: Jens Remus <jremus@linux.ibm.com>
---

Notes (jremus):
    Changes in RFC v2:
    - Rename generic_sframe_cfa_offset_decode() to
      sframe_cfa_offset_decode(). (Josh)

 include/asm-generic/unwind_user_sframe.h | 8 ++++++++
 kernel/unwind/sframe.c                   | 1 +
 2 files changed, 9 insertions(+)

diff --git a/include/asm-generic/unwind_user_sframe.h b/include/asm-generic/unwind_user_sframe.h
index fd71d6b1916b..ec68a77551f0 100644
--- a/include/asm-generic/unwind_user_sframe.h
+++ b/include/asm-generic/unwind_user_sframe.h
@@ -10,6 +10,14 @@
 #define SFRAME_SP_OFFSET 0
 #endif
 
+#ifndef sframe_cfa_offset_decode
+static inline s32 sframe_cfa_offset_decode(s32 offset)
+{
+	return offset;
+}
+#define sframe_cfa_offset_decode sframe_cfa_offset_decode
+#endif
+
 #ifndef sframe_init_reginfo
 static inline void
 sframe_init_reginfo(struct unwind_user_reginfo *reginfo, s32 offset)
diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c
index 45cd7380ac38..92f770fc21f6 100644
--- a/kernel/unwind/sframe.c
+++ b/kernel/unwind/sframe.c
@@ -226,6 +226,7 @@ static __always_inline int __read_fre(struct sframe_section *sec,
 
 	UNSAFE_GET_USER_INC(cfa_off, cur, offset_size, Efault);
 	offset_count--;
+	cfa_off = sframe_cfa_offset_decode(cfa_off);
 
 	ra_off = sec->ra_off;
 	if (!ra_off && offset_count) {
-- 
2.51.0