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>

1 files changed, 4 insertions, 6 deletions

diff --git a/arch/x86/kernel/signal_64.c b/arch/x86/kernel/signal_64.c
index 9c469da7f9e8..3d0deb336745 100644
--- 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;