# \[PATCH 03/15\] vdso/getrandom: Define fallback \_\_arch\_get\_vdso\_u\_rng\_data() in getrandom.c

- From: Thomas Weißschuh \<hidden\>
- Date: 2026-09-09 08:51:56 
- List: linux-arch
- Page: https://ratatoskr.run/linux-arch/2026/09/17536349
- Thread: https://ratatoskr.run/linux-s390/2026/09/17536347/t.md

```text
__arch_get_vdso_u_rng_data() is only used in getrandom.c. vsyscall.h
has become a dumping ground for different kinds of fallbacks.

Move the fallback function definition into getrandom.c,
similar to other fallbacks.

Signed-off-by: Thomas Weißschuh <redacted>
---
 include/asm-generic/vdso/vsyscall.h | 7 -------
 lib/vdso/getrandom.c                | 7 +++++++
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/asm-generic/vdso/vsyscall.h b/include/asm-generic/vdso/vsyscall.h
index fe12fb1fb442..cdf7b39cd349 100644
--- a/include/asm-generic/vdso/vsyscall.h
+++ b/include/asm-generic/vdso/vsyscall.h
@@ -4,13 +4,6 @@
 
 #ifndef __ASSEMBLER__
 
-#ifndef __arch_get_vdso_u_rng_data
-static __always_inline const struct vdso_rng_data *__arch_get_vdso_u_rng_data(void)
-{
-	return &vdso_u_rng_data;
-}
-#endif
-
 #ifndef __arch_update_vdso_clock
 static __always_inline void __arch_update_vdso_clock(struct vdso_clock *vc)
 {
diff --git a/lib/vdso/getrandom.c b/lib/vdso/getrandom.c
index 2851afa9154f..6ff46549281c 100644
--- a/lib/vdso/getrandom.c
+++ b/lib/vdso/getrandom.c
@@ -19,6 +19,13 @@
 /* Bring in default accessors */
 #include <vdso/vsyscall.h>
 
+#ifndef __arch_get_vdso_u_rng_data
+static __always_inline const struct vdso_rng_data *__arch_get_vdso_u_rng_data(void)
+{
+	return &vdso_u_rng_data;
+}
+#endif
+
 #define MEMCPY_AND_ZERO_SRC(type, dst, src, len) do {				\
 	while (len >= sizeof(type)) {						\
 		__put_unaligned_t(type, __get_unaligned_t(type, src), dst);	\

-- 
2.55.0

```