m68k: switch to generic sigaltstack

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

2 files changed, 4 insertions, 13 deletions

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 6710084e072a..3e73dca71677 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -18,6 +18,7 @@ config M68K
         select HAVE_MOD_ARCH_SPECIFIC
         select MODULES_USE_ELF_REL
         select MODULES_USE_ELF_RELA
+        select GENERIC_SIGALTSTACK
 
 config RWSEM_GENERIC_SPINLOCK
         bool
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index 9a396cda3147..41a34de4b4b4 100644
--- a/arch/m68k/kernel/signal.c
+++ b/arch/m68k/kernel/signal.c
@@ -267,13 +267,6 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
         return ret;
 }
 
-asmlinkage int
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
-{
-        return do_sigaltstack(uss, uoss, rdusp());
-}
-
-
 /*
  * Do a signal return; undo the signal stack.
  *
@@ -765,8 +758,9 @@ rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
         err |= __get_user(temp, &uc->uc_formatvec);
 
         err |= rt_restore_fpu_state(uc);
+        err |= restore_altstack(&uc->uc_stack);
 
-        if (err || do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
+        if (err)
                 goto badframe;
 
         if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
@@ -1014,11 +1008,7 @@ static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
         /* Create the ucontext.  */
         err |= __put_user(0, &frame->uc.uc_flags);
         err |= __put_user(NULL, &frame->uc.uc_link);
-        err |= __put_user((void __user *)current->sas_ss_sp,
-                          &frame->uc.uc_stack.ss_sp);
-        err |= __put_user(sas_ss_flags(rdusp()),
-                          &frame->uc.uc_stack.ss_flags);
-        err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+        err |= __save_altstack(&frame->uc.uc_stack, rdusp());
         err |= rt_setup_ucontext(&frame->uc, regs);
         err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));