linux/arch/x86/vdso/vextern.h

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#ifndef VEXTERN
#include <asm/vsyscall.h>
#define VEXTERN(x) \
extern typeof(x) *vdso_ ## x __attribute__((visibility("hidden")));
#endif
#define VMAGIC 0xfeedbabeabcdefabUL
/* Any kernel variables used in the vDSO must be exported in the main
kernel's vmlinux.lds.S/vsyscall.h/proper __section and
put into vextern.h and be referenced as a pointer with vdso prefix.
The main kernel later fills in the values. */
VEXTERN(jiffies)
VEXTERN(vgetcpu_mode)
VEXTERN(vsyscall_gtod_data)