s390: switch to generic compat rt_sigaction

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

arch/s390/Kconfig

@@ -141,6 +141,7 @@ config S390
 	select MODULES_USE_ELF_RELA
 	select CLONE_BACKWARDS2
 	select GENERIC_SIGALTSTACK
+	select GENERIC_COMPAT_RT_SIGACTION
 	select GENERIC_COMPAT_RT_SIGQUEUEINFO
 	select GENERIC_COMPAT_RT_SIGPROCMASK
 	select GENERIC_COMPAT_RT_SIGPENDING

arch/s390/kernel/compat_linux.h

@@ -68,12 +68,6 @@ struct sigcontext32
 };
 
 /* asm/signal.h */
-struct sigaction32 {
-	__u32		sa_handler;		/* pointer */
-	__u32		sa_flags;
-        __u32		sa_restorer;		/* pointer */
-	compat_sigset_t	sa_mask;        /* mask last for extensibility */
-};
 
 /* asm/ucontext.h */
 struct ucontext32 {
@@ -139,6 +133,4 @@ long sys32_fadvise64(int fd, loff_t offset, size_t len, int advise);
 long sys32_fadvise64_64(struct fadvise64_64_args __user *args);
 long sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
 		     struct old_sigaction32 __user *oact);
-long sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
-			struct sigaction32 __user *oact, size_t sigsetsize);
 #endif /* _ASM_S390X_S390_H */

arch/s390/kernel/compat_signal.c

@@ -194,46 +194,6 @@ sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
 	return ret;
 }
 
-asmlinkage long
-sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
-	   struct sigaction32 __user *oact,  size_t sigsetsize)
-{
-	struct k_sigaction new_ka, old_ka;
-	unsigned long sa_handler;
-	int ret;
-	compat_sigset_t set32;
-
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(compat_sigset_t))
-		return -EINVAL;
-
-	if (act) {
-		ret = get_user(sa_handler, &act->sa_handler);
-		ret |= __copy_from_user(&set32, &act->sa_mask,
-					sizeof(compat_sigset_t));
-		new_ka.sa.sa_mask.sig[0] =
-			set32.sig[0] | (((long)set32.sig[1]) << 32);
-		ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
-		
-		if (ret)
-			return -EFAULT;
-		new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
-	}
-
-	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
-	if (!ret && oact) {
-		set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
-		set32.sig[0] = old_ka.sa.sa_mask.sig[0];
-		ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
-		ret |= __copy_to_user(&oact->sa_mask, &set32,
-				      sizeof(compat_sigset_t));
-		ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
-	}
-
-	return ret;
-}
-
 static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
 {
 	_s390_regs_common32 regs32;

arch/s390/kernel/compat_wrapper.S

@@ -691,7 +691,7 @@ ENTRY(sys32_rt_sigaction_wrapper)
 	llgtr	%r3,%r3			# const struct sigaction_emu31 *
 	llgtr	%r4,%r4			# const struct sigaction_emu31 *
 	llgfr	%r5,%r5			# size_t
-	jg	sys32_rt_sigaction	# branch to system call
+	jg	compat_sys_rt_sigaction	# branch to system call
 
 ENTRY(sys32_rt_sigprocmask_wrapper)
 	lgfr	%r2,%r2			# int