powerpc/vdso: Provide clock_getres_time64()

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>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Link: https://patch.msgid.link/20260114-vdso-powerpc-align-v1-1-acf09373d568@linutronix.de

Author: t-8ch

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);

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()

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;

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,