1 files changed, 7 insertions, 10 deletions

diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h
index 4a040f0078f2..70c439f9071b 100644
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -96,11 +96,13 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
 }
 
 /*
- * user_mode_vm(regs) determines whether a register set came from user mode.
- * This is true if V8086 mode was enabled OR if the register set was from
- * protected mode with RPL-3 CS value.  This tricky test checks that with
- * one comparison.  Many places in the kernel can bypass this full check
- * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
+ * user_mode(regs) determines whether a register set came from user
+ * mode.  On x86_32, this is true if V8086 mode was enabled OR if the
+ * register set was from protected mode with RPL-3 CS value.  This
+ * tricky test checks that with one comparison.
+ *
+ * On x86_64, vm86 mode is mercifully nonexistent, and we don't need
+ * the extra check.
  */
 static inline int user_mode(struct pt_regs *regs)
 {
@@ -113,12 +115,7 @@ static inline int user_mode(struct pt_regs *regs)
 
 static inline int user_mode_vm(struct pt_regs *regs)
 {
-#ifdef CONFIG_X86_32
-        return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
-                USER_RPL;
-#else
         return user_mode(regs);
-#endif
 }
 
 /*