[PATCH v7 24/25] x86: Add clock_gettime64 entry point

[Vincenzo Frascino <vincenzo.frascino@arm.com>]

With the release of Linux 5.1 has been added a new syscall,
clock_gettime64, that provided a 64 bit time value for a specified
clock_ID to make the kernel Y2038 safe on 32 bit architectures.

Update the x86 specific vDSO library accordingly with what it has
been done for the kernel syscall exposing the clock_gettime64 entry
point.

Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
---
 arch/x86/entry/vdso/vclock_gettime.c    | 7 +++++++
 arch/x86/entry/vdso/vdso32/vdso32.lds.S | 1 +
 2 files changed, 8 insertions(+)

diff --git a/arch/x86/entry/vdso/vclock_gettime.c b/arch/x86/entry/vdso/vclock_gettime.c
index de9212a4833e..d6d03e933191 100644
--- a/arch/x86/entry/vdso/vclock_gettime.c
+++ b/arch/x86/entry/vdso/vclock_gettime.c
@@ -65,6 +65,13 @@ int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts)
 int clock_gettime(clockid_t, struct old_timespec32 *)
 	__attribute__((weak, alias("__vdso_clock_gettime")));
 
+int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts)
+{
+	return __cvdso_clock_gettime(clock, ts);
+}
+int clock_gettime64(clockid_t, struct __kernel_timespec *)
+	__attribute__((weak, alias("__vdso_clock_gettime64")));
+
 int __vdso_clock_getres(clockid_t clock,
 			struct old_timespec32 *res)
 {
diff --git a/arch/x86/entry/vdso/vdso32/vdso32.lds.S b/arch/x86/entry/vdso/vdso32/vdso32.lds.S
index 991b26cc855b..c7720995ab1a 100644
--- a/arch/x86/entry/vdso/vdso32/vdso32.lds.S
+++ b/arch/x86/entry/vdso/vdso32/vdso32.lds.S
@@ -27,6 +27,7 @@ VERSION
 		__vdso_gettimeofday;
 		__vdso_time;
 		__vdso_clock_getres;
+		__vdso_clock_gettime64;
 	};
 
 	LINUX_2.5 {
-- 
2.21.0