hexagon: switch to generic sigaltstack

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

2 files changed, 2 insertions, 14 deletions

diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 0744f7d7b1fd..3e6e27c11f93 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -31,6 +31,7 @@ config HEXAGON
         select GENERIC_CLOCKEVENTS
         select GENERIC_CLOCKEVENTS_BROADCAST
         select MODULES_USE_ELF_RELA
+        select GENERIC_SIGALTSTACK
         ---help---
           Qualcomm Hexagon is a processor architecture designed for high
           performance and low power across a wide variety of applications.
diff --git a/arch/hexagon/kernel/signal.c b/arch/hexagon/kernel/signal.c
index fe0d1373165d..46ebd4794663 100644
--- a/arch/hexagon/kernel/signal.c
+++ b/arch/hexagon/kernel/signal.c
@@ -247,12 +247,6 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
 /*
  * Architecture-specific wrappers for signal-related system calls
  */
-asmlinkage int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
-{
-        struct pt_regs *regs = current_pt_regs();
-
-        return do_sigaltstack(uss, uoss, regs->r29);
-}
 
 asmlinkage int sys_rt_sigreturn(void)
 {
@@ -288,14 +282,7 @@ asmlinkage int sys_rt_sigreturn(void)
          */
         regs->syscall_nr = __NR_rt_sigreturn;
 
-        /*
-         * If we were meticulous, we'd only call this if we knew that
-         * we were actually going to use an alternate stack, and we'd
-         * consider any error to be fatal.  What we do here, in common
-         * with many other architectures, is call it blindly and only
-         * consider the -EFAULT return case to be proof of a problem.
-         */
-        if (do_sigaltstack(&frame->uc.uc_stack, NULL, pt_psp(regs)) == -EFAULT)
+        if (restore_altstack(&frame->uc.uc_stack))
                 goto badframe;
 
         return 0;