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/usr/include/x86_64-linux-gnu/asm/vsyscall.h is in linux-libc-dev 4.15.0-20.21.

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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _ASM_X86_VSYSCALL_H
#define _ASM_X86_VSYSCALL_H

enum vsyscall_num {
	__NR_vgettimeofday,
	__NR_vtime,
	__NR_vgetcpu,
};

#define VSYSCALL_ADDR (-10UL << 20)

#endif /* _ASM_X86_VSYSCALL_H */