powerpc/vdso: Respect COMPAT_32BIT_TIME

If CONFIG_COMPAT_32BIT_TIME is disabled then the vDSO should not
provide any 32-bit time related functionality. This is the intended
effect of the kconfig option and also the fallback system calls would
also not be implemented.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20260702-vdso-compat_32bit_time-v3-6-db9f36d8d432@linutronix.de

3 files changed, 23 insertions, 9 deletions

diff --git a/arch/powerpc/kernel/vdso/gettimeofday.S b/arch/powerpc/kernel/vdso/gettimeofday.S
index 1c8e51691bf8..c635cd1e77be 100644
--- a/arch/powerpc/kernel/vdso/gettimeofday.S
+++ b/arch/powerpc/kernel/vdso/gettimeofday.S
@@ -67,9 +67,11 @@
  * int __kernel_gettimeofday(struct timeval *tv, struct timezone *tz);
  *
  */
+#if defined(__powerpc64__) || defined(CONFIG_COMPAT_32BIT_TIME)
 V_FUNCTION_BEGIN(__kernel_gettimeofday)
 	cvdso_call __c_kernel_gettimeofday
 V_FUNCTION_END(__kernel_gettimeofday)
+#endif
 
 /*
  * Exact prototype of clock_gettime()
@@ -77,9 +79,11 @@ V_FUNCTION_END(__kernel_gettimeofday)
  * int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp);
  *
  */
+#if defined(__powerpc64__) || defined(CONFIG_COMPAT_32BIT_TIME)
 V_FUNCTION_BEGIN(__kernel_clock_gettime)
 	cvdso_call __c_kernel_clock_gettime
 V_FUNCTION_END(__kernel_clock_gettime)
+#endif
 
 /*
  * Exact prototype of clock_gettime64()
@@ -99,9 +103,11 @@ V_FUNCTION_END(__kernel_clock_gettime64)
  * int __kernel_clock_getres(clockid_t clock_id, struct timespec *res);
  *
  */
+#if defined(__powerpc64__) || defined(CONFIG_COMPAT_32BIT_TIME)
 V_FUNCTION_BEGIN(__kernel_clock_getres)
 	cvdso_call __c_kernel_clock_getres
 V_FUNCTION_END(__kernel_clock_getres)
+#endif
 
 /*
  * Exact prototype of clock_getres_time64()
@@ -122,6 +128,8 @@ V_FUNCTION_END(__kernel_clock_getres_time64)
  * time_t time(time *t);
  *
  */
+#if defined(__powerpc64__) || defined(CONFIG_COMPAT_32BIT_TIME)
 V_FUNCTION_BEGIN(__kernel_time)
 	cvdso_call __c_kernel_time call_time=1
 V_FUNCTION_END(__kernel_time)
+#endif
diff --git a/arch/powerpc/kernel/vdso/vdso32.lds.S b/arch/powerpc/kernel/vdso/vdso32.lds.S
index 3f384a2526ae..5e87c18fd282 100644
--- a/arch/powerpc/kernel/vdso/vdso32.lds.S
+++ b/arch/powerpc/kernel/vdso/vdso32.lds.S
@@ -119,13 +119,15 @@ VERSION
 {
 	VDSO_VERSION_STRING {
 	global:
-		__kernel_get_syscall_map;
+#ifdef CONFIG_COMPAT_32BIT_TIME
 		__kernel_gettimeofday;
 		__kernel_clock_gettime;
-		__kernel_clock_gettime64;
 		__kernel_clock_getres;
-		__kernel_clock_getres_time64;
 		__kernel_time;
+#endif /* CONFIG_COMPAT_32BIT_TIME */
+		__kernel_get_syscall_map;
+		__kernel_clock_gettime64;
+		__kernel_clock_getres_time64;
 		__kernel_get_tbfreq;
 		__kernel_sync_dicache;
 		__kernel_sigtramp32;
diff --git a/arch/powerpc/kernel/vdso/vgettimeofday.c b/arch/powerpc/kernel/vdso/vgettimeofday.c
index 3c194e1ab562..4b712fb01a3f 100644
--- a/arch/powerpc/kernel/vdso/vgettimeofday.c
+++ b/arch/powerpc/kernel/vdso/vgettimeofday.c
@@ -18,23 +18,25 @@ int __c_kernel_clock_getres(clockid_t clock_id, struct __kernel_timespec *res,
 	return __cvdso_clock_getres_data(vd, clock_id, res);
 }
 #else
+#ifdef CONFIG_COMPAT_32BIT_TIME
 int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts,
 			     const struct vdso_time_data *vd)
 {
 	return __cvdso_clock_gettime32_data(vd, clock, ts);
 }
 
-int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts,
-			       const struct vdso_time_data *vd)
-{
-	return __cvdso_clock_gettime_data(vd, clock, ts);
-}
-
 int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res,
 			    const struct vdso_time_data *vd)
 {
 	return __cvdso_clock_getres_time32_data(vd, clock_id, res);
 }
+#endif /* CONFIG_COMPAT_32BIT_TIME */
+
+int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts,
+			       const struct vdso_time_data *vd)
+{
+	return __cvdso_clock_gettime_data(vd, clock, ts);
+}
 
 int __c_kernel_clock_getres_time64(clockid_t clock_id, struct __kernel_timespec *res,
 				   const struct vdso_time_data *vd)
@@ -43,6 +45,7 @@ int __c_kernel_clock_getres_time64(clockid_t clock_id, struct __kernel_timespec
 }
 #endif
 
+#if defined(__powerpc64__) || defined(CONFIG_COMPAT_32BIT_TIME)
 int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz,
 			    const struct vdso_time_data *vd)
 {
@@ -53,3 +56,4 @@ __kernel_old_time_t __c_kernel_time(__kernel_old_time_t *time, const struct vdso
 {
 	return __cvdso_time_data(vd, time);
 }
+#endif