x86/vdso: Move the rng offset to vsyscall.h

vvar.h will go away, so move the last useful bit into vsyscall.h.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-17-b64f0842d512@linutronix.de

Author: t-8ch

arch/x86/entry/vdso/vdso-layout.lds.S

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #include <asm/vdso.h>
+#include <asm/vdso/vsyscall.h>
 
 /*
  * Linker script for vDSO.  This is an ELF shared object prelinked to

arch/x86/include/asm/vdso/vsyscall.h

@@ -2,11 +2,12 @@
 #ifndef __ASM_VDSO_VSYSCALL_H
 #define __ASM_VDSO_VSYSCALL_H
 
+#define __VDSO_RND_DATA_OFFSET  640
+
 #ifndef __ASSEMBLY__
 
 #include <vdso/datapage.h>
 #include <asm/vgtod.h>
-#include <asm/vvar.h>
 
 extern struct vdso_data *vdso_data;
 

arch/x86/include/asm/vvar.h

@@ -19,8 +19,6 @@
 #ifndef _ASM_X86_VVAR_H
 #define _ASM_X86_VVAR_H
 
-#define __VDSO_RND_DATA_OFFSET  640
-
 #ifdef EMIT_VVAR
 /*
  * EMIT_VVAR() is used by the kernel linker script to put vvars in the