x86: signal: cosmetic unification of sys_sigaltstack()

Impact: cleanup

Add #ifdef directive for unification.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/signal_32.c

@@ -125,6 +125,7 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
 	return ret;
 }
 
+#ifdef CONFIG_X86_32
 asmlinkage int sys_sigaltstack(unsigned long bx)
 {
 	/*
@@ -137,6 +138,14 @@ asmlinkage int sys_sigaltstack(unsigned long bx)
 
 	return do_sigaltstack(uss, uoss, regs->sp);
 }
+#else /* !CONFIG_X86_32 */
+asmlinkage long
+sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
+		struct pt_regs *regs)
+{
+	return do_sigaltstack(uss, uoss, regs->sp);
+}
+#endif /* CONFIG_X86_32 */
 
 #define COPY(x)			{		\
 	err |= __get_user(regs->x, &sc->x);	\

arch/x86/kernel/signal_64.c

@@ -50,12 +50,27 @@
 # define FIX_EFLAGS	__FIX_EFLAGS
 #endif
 
+#ifdef CONFIG_X86_32
+asmlinkage int sys_sigaltstack(unsigned long bx)
+{
+	/*
+	 * This is needed to make gcc realize it doesn't own the
+	 * "struct pt_regs"
+	 */
+	struct pt_regs *regs = (struct pt_regs *)&bx;
+	const stack_t __user *uss = (const stack_t __user *)bx;
+	stack_t __user *uoss = (stack_t __user *)regs->cx;
+
+	return do_sigaltstack(uss, uoss, regs->sp);
+}
+#else /* !CONFIG_X86_32 */
 asmlinkage long
 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
 		struct pt_regs *regs)
 {
 	return do_sigaltstack(uss, uoss, regs->sp);
 }
+#endif /* CONFIG_X86_32 */
 
 #define COPY(x)			{		\
 	err |= __get_user(regs->x, &sc->x);	\