blackfin: switch to generic sigaltstack

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

2 files changed, 3 insertions, 10 deletions

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index b6f3ad5441c5..a8a9ca7d40f3 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -45,6 +45,7 @@ config BLACKFIN
         select ARCH_USES_GETTIMEOFFSET if !GENERIC_CLOCKEVENTS
         select HAVE_MOD_ARCH_SPECIFIC
         select MODULES_USE_ELF_RELA
+        select GENERIC_SIGALTSTACK
 
 config GENERIC_CSUM
         def_bool y
diff --git a/arch/blackfin/kernel/signal.c b/arch/blackfin/kernel/signal.c
index 84b4be05840c..b022af6c48f8 100644
--- a/arch/blackfin/kernel/signal.c
+++ b/arch/blackfin/kernel/signal.c
@@ -37,11 +37,6 @@ struct rt_sigframe {
         struct ucontext uc;
 };
 
-asmlinkage int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
-{
-        return do_sigaltstack(uss, uoss, rdusp());
-}
-
 static inline int
 rt_restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *pr0)
 {
@@ -100,7 +95,7 @@ asmlinkage int sys_rt_sigreturn(void)
         if (rt_restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
                 goto badframe;
 
-        if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->usp) == -EFAULT)
+        if (restore_altstack(&frame->uc.uc_stack))
                 goto badframe;
 
         return r0;
@@ -178,10 +173,7 @@ 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(0, &frame->uc.uc_link);
-        err |=
-            __put_user((void *)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_sigcontext(&frame->uc.uc_mcontext, regs);
         err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));