x86: signal_64.c: get_stack() doesn't need entire regs

Impact: cleanup

get_stack() uses sp only, entire regs is not needed.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/signal_64.c b/arch/x86/kernel/signal_64.c
index 9c469da7f9e8a3ed58b78a9f40dbca67b294e0c7..3d0deb33674584e8ea9a7f1866ce02da43987eb1 100644 (file)
--- a/arch/x86/kernel/signal_64.c
+++ b/arch/x86/kernel/signal_64.c
@@ -199,12 +199,10 @@ setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
  */
 
 static void __user *
-get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size)
+get_stack(struct k_sigaction *ka, unsigned long sp, unsigned long size)
 {
-       unsigned long sp;
-
        /* Default to using normal stack - redzone*/
-       sp = regs->sp - 128;
+       sp -= 128;
 
        /* This is the X/Open sanctioned signal stack switching.  */
        if (ka->sa.sa_flags & SA_ONSTACK) {
@@ -224,14 +222,14 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
        struct task_struct *me = current;
 
        if (used_math()) {
-               fp = get_stack(ka, regs, sig_xstate_size);
+               fp = get_stack(ka, regs->sp, sig_xstate_size);
                frame = (void __user *)round_down(
                        (unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
 
                if (save_i387_xstate(fp) < 0)
                        return -EFAULT;
        } else
-               frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8;
+               frame = get_stack(ka, regs->sp, sizeof(struct rt_sigframe)) - 8;
 
        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
                return -EFAULT;