x86: signal_64: make setup_sigcontext() similar

Impact: cleanup

remove passing task struct.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/signal_64.c

@@ -160,8 +160,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
 
 static inline int
 setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
-		 struct pt_regs *regs,
-		 unsigned long mask, struct task_struct *me)
+		 struct pt_regs *regs, unsigned long mask)
 {
 	int err = 0;
 
@@ -185,13 +184,13 @@ setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
 	err |= __put_user(regs->r13, &sc->r13);
 	err |= __put_user(regs->r14, &sc->r14);
 	err |= __put_user(regs->r15, &sc->r15);
-	err |= __put_user(me->thread.trap_no, &sc->trapno);
-	err |= __put_user(me->thread.error_code, &sc->err);
+	err |= __put_user(current->thread.trap_no, &sc->trapno);
+	err |= __put_user(current->thread.error_code, &sc->err);
 	err |= __put_user(regs->ip, &sc->ip);
 	err |= __put_user(regs->flags, &sc->flags);
 	err |= __put_user(fpstate, &sc->fpstate);
 	err |= __put_user(mask, &sc->oldmask);
-	err |= __put_user(me->thread.cr2, &sc->cr2);
+	err |= __put_user(current->thread.cr2, &sc->cr2);
 
 	return err;
 }
@@ -251,8 +250,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	err |= __put_user(sas_ss_flags(regs->sp),
 			  &frame->uc.uc_stack.ss_flags);
 	err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
-	err |= setup_sigcontext(&frame->uc.uc_mcontext, fp,
-				regs, set->sig[0], me);
+	err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
 	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
 	/* Set up to return from userspace.  If provided, use a stub