[PATCH] powerpc/vdso: Provide clock_getres_time64()

Thomas Weißschuh
2026-01-14T07:26:21Z

For consistency with __vdso_clock_gettime64() there should also be a
64-bit variant of clock_getres(). This will allow the extension of
CONFIG_COMPAT_32BIT_TIME to the vDSO and finally the removal of 32-bit
time types from the kernel and UAPI.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
Based on tip/timers/vdso.

This was missed in the original vdso_getres_time64() series as powerpc
does not use include/vdso/gettime.h.
---
arch/powerpc/include/asm/vdso/gettimeofday.h | 2 ++
arch/powerpc/kernel/vdso/gettimeofday.S | 12 ++++++++++++
arch/powerpc/kernel/vdso/vdso32.lds.S | 1 +
arch/powerpc/kernel/vdso/vgettimeofday.c | 6 ++++++
4 files changed, 21 insertions(+)

diff --git a/arch/powerpc/include/asm/vdso/gettimeofday.h b/arch/powerpc/include/asm/vdso/gettimeofday.h
index ab3df12c8d94..8ea397e26ad0 100644
--- a/arch/powerpc/include/asm/vdso/gettimeofday.h
+++ b/arch/powerpc/include/asm/vdso/gettimeofday.h
@@ -135,6 +135,8 @@ int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts,
const struct vdso_time_data *vd);
int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res,
const struct vdso_time_data *vd);
+int __c_kernel_clock_getres_time64(clockid_t clock_id, struct __kernel_timespec *res,
+ const struct vdso_time_data *vd);
#endif
int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz,
const struct vdso_time_data *vd);
diff --git a/arch/powerpc/kernel/vdso/gettimeofday.S b/arch/powerpc/kernel/vdso/gettimeofday.S
index 79c967212444..1c8e51691bf8 100644
--- a/arch/powerpc/kernel/vdso/gettimeofday.S
+++ b/arch/powerpc/kernel/vdso/gettimeofday.S
@@ -103,6 +103,18 @@ V_FUNCTION_BEGIN(__kernel_clock_getres)
cvdso_call __c_kernel_clock_getres
V_FUNCTION_END(__kernel_clock_getres)

+/*
+ * Exact prototype of clock_getres_time64()
+ *
+ * int __kernel_clock_getres(clockid_t clock_id, struct __timespec64 *res);
+ *
+ */
+#ifndef __powerpc64__
+V_FUNCTION_BEGIN(__kernel_clock_getres_time64)
+ cvdso_call __c_kernel_clock_getres_time64
+V_FUNCTION_END(__kernel_clock_getres_time64)
+#endif
+

/*
* Exact prototype of time()
diff --git a/arch/powerpc/kernel/vdso/vdso32.lds.S b/arch/powerpc/kernel/vdso/vdso32.lds.S
index 72a1012b8a20..3f384a2526ae 100644
--- a/arch/powerpc/kernel/vdso/vdso32.lds.S
+++ b/arch/powerpc/kernel/vdso/vdso32.lds.S
@@ -124,6 +124,7 @@ VERSION
__kernel_clock_gettime;
__kernel_clock_gettime64;
__kernel_clock_getres;
+ __kernel_clock_getres_time64;
__kernel_time;
__kernel_get_tbfreq;
__kernel_sync_dicache;
diff --git a/arch/powerpc/kernel/vdso/vgettimeofday.c b/arch/powerpc/kernel/vdso/vgettimeofday.c
index 6f5167d81af5..3c194e1ab562 100644
--- a/arch/powerpc/kernel/vdso/vgettimeofday.c
+++ b/arch/powerpc/kernel/vdso/vgettimeofday.c
@@ -35,6 +35,12 @@ int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res,
{
return __cvdso_clock_getres_time32_data(vd, clock_id, res);
}
+
+int __c_kernel_clock_getres_time64(clockid_t clock_id, struct __kernel_timespec *res,
+ const struct vdso_time_data *vd)
+{
+ return __cvdso_clock_getres_data(vd, clock_id, res);
+}
#endif

int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz,

---
base-commit: 0e55e7636697077abceb2301d7d2718d75c34389
change-id: 20260113-vdso-powerpc-align-e8e93664da2b

Best regards,
--
Thomas Weißschuh <thomas.weissschuh@linutronix.de>