cris: switch to generic sigaltstack

Signed-off-by: Al Viro <[e-mail]>

arch/cris/Kconfig

···
 	select GENERIC_CMOS_UPDATE
 	select MODULES_USE_ELF_RELA
 	select CLONE_BACKWARDS2
+	select GENERIC_SIGALTSTACK
 
 config HZ
 	int

arch/cris/arch-v10/kernel/signal.c

···
 	return ret;
 }
 
-int sys_sigaltstack(const stack_t *uss, stack_t __user *uoss)
-{
-	return do_sigaltstack(uss, uoss, rdusp());
-}
-
-
 /*
  * Do a signal return; undo the signal stack.
  */
···
 	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
 		goto badframe;
 
-	if (do_sigaltstack(&frame->uc.uc_stack, NULL, rdusp()) == -EFAULT)
+	if (restore_altstack(&frame->uc.uc_stack))
 		goto badframe;
 
 	return regs->r10;

arch/cris/arch-v32/kernel/signal.c

···
 	return retval;
 }
 
-int
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
-{
-	return do_sigaltstack(uss, uoss, rdusp());
-}
-
 static int
 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
 {
···
 	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
 		goto badframe;
 
-	if (do_sigaltstack(&frame->uc.uc_stack, NULL, rdusp()) == -EFAULT)
+	if (restore_altstack(&frame->uc.uc_stack))
 		goto badframe;
 
 	keep_debug_flags(oldccs, oldspc, regs);