mn10300: switch to generic sigaltstack

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 3 insertions, 13 deletions

diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index e70001cfa05b..cb5022029606 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -10,6 +10,7 @@ config MN10300
         select HAVE_NMI_WATCHDOG if MN10300_WD_TIMER
         select GENERIC_CLOCKEVENTS
         select MODULES_USE_ELF_RELA
+        select GENERIC_SIGALTSTACK
 
 config AM33_2
         def_bool n
diff --git a/arch/mn10300/kernel/signal.c b/arch/mn10300/kernel/signal.c
index f570b3085ef9..8223eb371e65 100644
--- a/arch/mn10300/kernel/signal.c
+++ b/arch/mn10300/kernel/signal.c
@@ -77,14 +77,6 @@ asmlinkage long sys_sigaction(int sig,
 }
 
 /*
- * set alternate signal stack syscall
- */
-asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t *uoss)
-{
-        return do_sigaltstack(uss, uoss, current_frame()->sp);
-}
-
-/*
  * do a signal return; undo the signal stack.
  */
 static int restore_sigcontext(struct pt_regs *regs,
@@ -193,8 +185,7 @@ asmlinkage long sys_rt_sigreturn(void)
         if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0))
                 goto badframe;
 
-        if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) ==
-            -EFAULT)
+        if (restore_altstack(&frame->uc.uc_stack))
                 goto badframe;
 
         return d0;
@@ -359,9 +350,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
         /* create the ucontext.  */
         if (__put_user(0, &frame->uc.uc_flags) ||
             __put_user(0, &frame->uc.uc_link) ||
-            __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
-            __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) ||
-            __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) ||
+            __save_altstack(&frame->uc.uc_stack, regs->sp) ||
             setup_sigcontext(&frame->uc.uc_mcontext,
                              &frame->fpuctx, regs, set->sig[0]) ||
             __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))