x86, xen, vdso: fix build error, add sysctl_vsyscall32

commit c187263834465c2beededb4d19e7f6bab18cc757

Author: Ingo Molnar <[email protected]>
Date:   Fri Jul 11 22:34:26 2008 +0200

x86, xen, vdso: fix build error, add sysctl_vsyscall32

Xen recently tried to make use of sysctl_vsyscall32, with this result:

arch/x86/xen/built-in.o: In function `xen_enable_syscall':
(.cpuinit.text+0xdb): undefined reference to `sysctl_vsyscall32'

turns out when sysctl_vsyscall32 use was introduced, the variable was not defined anywhere.

---
 arch/x86/vdso/vdso32-setup.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

index 0bce542..0645fe9 100644
@@ -377,6 +377,8 @@ __initcall(sysenter_setup);
 /* Register vsyscall32 into the ABI table */
 #include <linux/sysctl.h>
 
+int sysctl_vsyscall32;
+
 static ctl_table abi_table2[] = {
 	{
 		.procname	= "vsyscall32",