commit ec93ac8663ad5fcccd44c3768b23c93b87610fc2
author Al Viro <viro@zeniv.linux.org.uk> Sun Dec 23 01:52:54 2012 -0500
committer Al Viro <viro@zeniv.linux.org.uk> Sun Feb 03 18:15:46 2013 -0500
tree 768f321442445310520b8c839c4228aaad1e4c1d
parent 0aa0203fb43f04714004b2c4ad33b858e240555d

arm: switch to generic sigaltstack

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

arch/arm/kernel/signal.c

diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 56f72d25..f1f6d21 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -300,7 +300,7 @@
 	if (restore_sigframe(regs, &frame->sig))
 		goto badframe;
 
-	if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT)
+	if (restore_altstack(&frame->sig.uc.uc_stack))
 		goto badframe;
 
 	return regs->ARM_r0;
@@ -486,7 +486,6 @@
 	       sigset_t *set, struct pt_regs *regs)
 {
 	struct rt_sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame));
-	stack_t stack;
 	int err = 0;
 
 	if (!frame)
@@ -497,12 +496,7 @@
 	__put_user_error(0, &frame->sig.uc.uc_flags, err);
 	__put_user_error(NULL, &frame->sig.uc.uc_link, err);
 
-	memset(&stack, 0, sizeof(stack));
-	stack.ss_sp = (void __user *)current->sas_ss_sp;
-	stack.ss_flags = sas_ss_flags(regs->ARM_sp);
-	stack.ss_size = current->sas_ss_size;
-	err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
-
+	err |= __save_altstack(&frame->sig.uc.uc_stack, regs->ARM_sp);
 	err |= setup_sigframe(&frame->sig, regs, set);
 	if (err == 0)
 		err = setup_return(regs, ka, frame->sig.retcode, frame, usig);