alpha: switch to generic sigaltstack

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

2 files changed, 2 insertions, 9 deletions

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 7e3710c0cce5..9d5904cc7712 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -22,6 +22,7 @@ config ALPHA
         select GENERIC_STRNLEN_USER
         select HAVE_MOD_ARCH_SPECIFIC
         select MODULES_USE_ELF_RELA
+        select GENERIC_SIGALTSTACK
         help
           The Alpha is a 64-bit general-purpose processor designed and
           marketed by the Digital Equipment Corporation of blessed memory,
diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c
index 336393c9c11f..02d02c047f17 100644
--- a/arch/alpha/kernel/signal.c
+++ b/arch/alpha/kernel/signal.c
@@ -122,12 +122,6 @@ SYSCALL_DEFINE1(sigsuspend, old_sigset_t, mask)
         return sigsuspend(&blocked);
 }
 
-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.
  */
@@ -418,9 +412,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
         err |= __put_user(0, &frame->uc.uc_flags);
         err |= __put_user(0, &frame->uc.uc_link);
         err |= __put_user(set->sig[0], &frame->uc.uc_osf_sigmask);
-        err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
-        err |= __put_user(sas_ss_flags(oldsp), &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, oldsp);
         err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, 
                                 set->sig[0], oldsp);
         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));