[PATCH] arm64: vdso: fix "no previous prototype" warning

[Marc Kleine-Budde]

If compiling the arm64 kernel with W=1 the following warning is produced:

| arch/arm64/kernel/vdso/vgettimeofday.c:9:5: error: no previous prototype for ‘__kernel_clock_gettime’ [-Werror=missing-prototypes]
|     9 | int __kernel_clock_gettime(clockid_t clock,
|       |     ^~~~~~~~~~~~~~~~~~~~~~
| arch/arm64/kernel/vdso/vgettimeofday.c:15:5: error: no previous prototype for ‘__kernel_gettimeofday’ [-Werror=missing-prototypes]
|    15 | int __kernel_gettimeofday(struct __kernel_old_timeval *tv,
|       |     ^~~~~~~~~~~~~~~~~~~~~
| arch/arm64/kernel/vdso/vgettimeofday.c:21:5: error: no previous prototype for ‘__kernel_clock_getres’ [-Werror=missing-prototypes]
|    21 | int __kernel_clock_getres(clockid_t clock_id,
|       |     ^~~~~~~~~~~~~~~~~~~~~

This patch adds the missing prototype to fix the warning and make
compilation with "CONFIG_WERROR=y" possible.

Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Vincenzo Frascino <vincenzo.frascino at arm.com>
Signed-off-by: Marc Kleine-Budde <mkl at pengutronix.de>
---
 arch/arm64/kernel/vdso/vgettimeofday.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/kernel/vdso/vgettimeofday.c b/arch/arm64/kernel/vdso/vgettimeofday.c
index 4236cf34d7d9..cc37674b9d35 100644
--- a/arch/arm64/kernel/vdso/vgettimeofday.c
+++ b/arch/arm64/kernel/vdso/vgettimeofday.c
@@ -6,18 +6,27 @@
  *
  */
 
+int __kernel_clock_gettime(clockid_t clock,
+			   struct __kernel_timespec *ts);
+
 int __kernel_clock_gettime(clockid_t clock,
 			   struct __kernel_timespec *ts)
 {
 	return __cvdso_clock_gettime(clock, ts);
 }
 
+int __kernel_gettimeofday(struct __kernel_old_timeval *tv,
+			  struct timezone *tz);
+
 int __kernel_gettimeofday(struct __kernel_old_timeval *tv,
 			  struct timezone *tz)
 {
 	return __cvdso_gettimeofday(tv, tz);
 }
 
+int __kernel_clock_getres(clockid_t clock_id,
+			  struct __kernel_timespec *res);
+
 int __kernel_clock_getres(clockid_t clock_id,
 			  struct __kernel_timespec *res)
 {
-- 
2.34.1