[PATCH 2/7] ARM: VDSO: Respect COMPAT_32BIT_TIME

Thomas Weißschuh
2026-02-27T06:58:30Z

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.

Currently the kconfig option does not affect the gettimeofday() syscall,
so also keep that in the vDSO.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
arch/arm/vdso/vdso.lds.S | 4 +++-
arch/arm/vdso/vgettimeofday.c | 14 ++++++++------
2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/arm/vdso/vdso.lds.S b/arch/arm/vdso/vdso.lds.S
index 74d8d8bc8a40..766aa632e16c 100644
--- a/arch/arm/vdso/vdso.lds.S
+++ b/arch/arm/vdso/vdso.lds.S
@@ -70,9 +70,11 @@ VERSION
{
LINUX_2.6 {
global:
+#ifdef CONFIG_COMPAT_32BIT_TIME
__vdso_clock_gettime;
- __vdso_gettimeofday;
__vdso_clock_getres;
+#endif /* CONFIG_COMPAT_32BIT_TIME */
+ __vdso_gettimeofday;
__vdso_clock_gettime64;
__vdso_clock_getres_time64;
local: *;
diff --git a/arch/arm/vdso/vgettimeofday.c b/arch/arm/vdso/vgettimeofday.c
index f7a2f5dc2fdc..31702f2f0547 100644
--- a/arch/arm/vdso/vgettimeofday.c
+++ b/arch/arm/vdso/vgettimeofday.c
@@ -10,17 +10,19 @@
#include <asm/unwind.h>
#include <vdso/gettime.h>

+#ifdef CONFIG_COMPAT_32BIT_TIME
int __vdso_clock_gettime(clockid_t clock,
struct old_timespec32 *ts)
{
return __cvdso_clock_gettime32(clock, ts);
}

-int __vdso_clock_gettime64(clockid_t clock,
- struct __kernel_timespec *ts)
+int __vdso_clock_getres(clockid_t clock_id,
+ struct old_timespec32 *res)
{
- return __cvdso_clock_gettime(clock, ts);
+ return __cvdso_clock_getres_time32(clock_id, res);
}
+#endif /* CONFIG_COMPAT_32BIT_TIME */

int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
struct timezone *tz)
@@ -28,10 +30,10 @@ int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
return __cvdso_gettimeofday(tv, tz);
}

-int __vdso_clock_getres(clockid_t clock_id,
- struct old_timespec32 *res)
+int __vdso_clock_gettime64(clockid_t clock,
+ struct __kernel_timespec *ts)
{
- return __cvdso_clock_getres_time32(clock_id, res);
+ return __cvdso_clock_gettime(clock, ts);
}

int __vdso_clock_getres_time64(clockid_t clock_id, struct __kernel_timespec *res)

--
2.53.0