root/arch/arm64/include/asm/vdso/clocksource.h 
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_VDSOCLOCKSOURCE_H
#define __ASM_VDSOCLOCKSOURCE_H

#define VDSO_ARCH_CLOCKMODES                                    \
        /* vdso clocksource for both 32 and 64bit tasks */      \
        VDSO_CLOCKMODE_ARCHTIMER,                               \
        /* vdso clocksource for 64bit tasks only */             \
        VDSO_CLOCKMODE_ARCHTIMER_NOCOMPAT

#endif