linux-kernel - [PATCH RFC 13/14] sparc64: vdso: Implement clock

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Message-Id: <20250724-vdso-sparc64-generic-2-v1-13-e376a3bd24d1@linutronix.de>
Date: Thu, 24 Jul 2025 08:27:03 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Vincenzo Frascino <vincenzo.frascino@....com>, 
 Arnd Bergmann <arnd@...db.de>, Shuah Khan <shuah@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, 
 Andreas Larsson <andreas@...sler.com>, 
 Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>, 
 Shannon Nelson <shannon.nelson@....com>, 
 Nick Alcock <nick.alcock@...cle.com>, John Stultz <jstultz@...gle.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 sparclinux@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH RFC 13/14] sparc64: vdso: Implement clock_gettime64()

To be y2038-safe, 32-bit userspace needs to explicitly call the 64-bit safe
time APIs.

Implement clock_gettime64() in the 32-bit vDSO.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 arch/sparc/vdso/vclock_gettime.c    | 8 ++++++++
 arch/sparc/vdso/vdso32/vdso32.lds.S | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/arch/sparc/vdso/vclock_gettime.c b/arch/sparc/vdso/vclock_gettime.c
index 093a7ff4dafce1cf0af5af4c303bef86e159858a..1d9859392e4cfd285349cf9155ca1fc25d3a7b41 100644
--- a/arch/sparc/vdso/vclock_gettime.c
+++ b/arch/sparc/vdso/vclock_gettime.c
@@ -48,4 +48,12 @@ int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts)
 int clock_gettime(clockid_t, struct old_timespec32 *)
 	__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 *)
+	__weak __alias(__vdso_clock_gettime64);
+
 #endif
diff --git a/arch/sparc/vdso/vdso32/vdso32.lds.S b/arch/sparc/vdso/vdso32/vdso32.lds.S
index 53575ee154c492f9503efdd8f995ac2a035203c7..a14e4f77e6f2222b855df27cc7a0d0a4f98bd4ac 100644
--- a/arch/sparc/vdso/vdso32/vdso32.lds.S
+++ b/arch/sparc/vdso/vdso32/vdso32.lds.S
@@ -17,6 +17,8 @@ VERSION {
 	global:
 		clock_gettime;
 		__vdso_clock_gettime;
+		clock_gettime64;
+		__vdso_clock_gettime64;
 		gettimeofday;
 		__vdso_gettimeofday;
 	local: *;

-- 
2.50.1