x86, vdso: Clean up 32-bit vs 64-bit vdso params

Rather than using 'vdso_enabled' and an awful #define, just call the
parameters vdso32_enabled and vdso64_enabled.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/87913de56bdcbae3d93917938302fc369b05caee.1399317206.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c
index 1ad1026..8b79039 100644
--- a/arch/x86/vdso/vma.c
+++ b/arch/x86/vdso/vma.c
@@ -17,7 +17,7 @@
 #include <asm/page.h>
 
 #if defined(CONFIG_X86_64)
-unsigned int __read_mostly vdso_enabled = 1;
+unsigned int __read_mostly vdso64_enabled = 1;
 
 DECLARE_VDSO_IMAGE(vdso);
 extern unsigned short vdso_sync_cpuid;
@@ -160,7 +160,7 @@
 	unsigned long addr;
 	int ret;
 
-	if (!vdso_enabled)
+	if (!vdso64_enabled)
 		return 0;
 
 	down_write(&mm->mmap_sem);
@@ -203,7 +203,7 @@
 
 static __init int vdso_setup(char *s)
 {
-	vdso_enabled = simple_strtoul(s, NULL, 0);
+	vdso64_enabled = simple_strtoul(s, NULL, 0);
 	return 0;
 }
 __setup("vdso=", vdso_setup);