[PATCH v6 1/3] arch: vDSO: Add a __vdso_getrandom prototype for all architectures

[Xi Ruoyao]

Without a prototype, we'll have to add a prototype for each architecture
implementing vDSO getrandom.  As most architectures will likely have the
vDSO getrandom implemented in a near future, and we'd like to keep the
declarations compatible everywhere (to ease the Glibc work), we should
really just have one copy of the prototype.

Suggested-by: Huacai Chen <chenhuacai@xxxxxxxxxx>
Signed-off-by: Xi Ruoyao <xry111@xxxxxxxxxxx>
---
 arch/x86/entry/vdso/vgetrandom.c | 2 --
 include/vdso/getrandom.h         | 5 +++++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/entry/vdso/vgetrandom.c b/arch/x86/entry/vdso/vgetrandom.c
index 52d3c7faae2e..430862b8977c 100644
--- a/arch/x86/entry/vdso/vgetrandom.c
+++ b/arch/x86/entry/vdso/vgetrandom.c
@@ -6,8 +6,6 @@
 
 #include "../../../../lib/vdso/getrandom.c"
 
-ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len);
-
 ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len)
 {
 	return __cvdso_getrandom(buffer, len, flags, opaque_state, opaque_len);
diff --git a/include/vdso/getrandom.h b/include/vdso/getrandom.h
index 4cf02e678f5e..08b47b002bf7 100644
--- a/include/vdso/getrandom.h
+++ b/include/vdso/getrandom.h
@@ -56,4 +56,9 @@ struct vgetrandom_state {
  */
 extern void __arch_chacha20_blocks_nostack(u8 *dst_bytes, const u32 *key, u32 *counter, size_t nblocks);
 
+/**
+ * __vdso_getrandom: Prototype of vDSO getrandom.
+ */
+extern ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len);
+
 #endif /* _VDSO_GETRANDOM_H */
-- 
2.46.0