x86: cleanup - rename VM_MASK to X86_VM_MASK

This patch renames VM_MASK to X86_VM_MASK (which
in turn defined as alias to X86_EFLAGS_VM) to better
distinguish from virtual memory flags. We can't just
use X86_EFLAGS_VM instead because it is also used
for conditional compilation

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 5104069..c866c00 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -299,7 +299,7 @@
 	VEFLAGS = info->regs.pt.flags;
 	info->regs.pt.flags &= SAFE_MASK;
 	info->regs.pt.flags |= info->regs32->flags & ~SAFE_MASK;
-	info->regs.pt.flags |= VM_MASK;
+	info->regs.pt.flags |= X86_VM_MASK;
 
 	switch (info->cpu_type) {
 	case CPU_286: