x86: fix merge mistake in i387.c

convert_fxsr_to_user() in 2.6.24's i387_32.c did this, and
convert_to_fxsr() also does the inverse, so I assume it's an oversight
that it is no longer being done.

[ mingo@elte.hu:

  we encode it this way because there's no space for the 'FPU Last
  Instruction Opcode' (->fop) field in the legacy user_i387_ia32_struct
  that PTRACE_GETFPREGS/PTRACE_SETFPREGS uses.

  it's probably pure legacy - i'd be surprised if any user-space relied on
  the FPU Last Opcode in any way. But indeed we used to do it previously
  so the most conservative thing is to preserve that piece of information.
]

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index 60fe801..d2e39e6 100644 (file)
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -261,7 +261,7 @@ static void convert_from_fxsr(struct user_i387_ia32_struct *env,
        }
 #else
        env->fip = fxsave->fip;
-       env->fcs = fxsave->fcs;
+       env->fcs = (u16) fxsave->fcs | ((u32) fxsave->fop << 16);
        env->foo = fxsave->foo;
        env->fos = fxsave->fos;
 #endif