powerpc: switch to generic compat rt_sigaction()

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

arch/powerpc/Kconfig

@@ -145,6 +145,7 @@ config PPC
 	select MODULES_USE_ELF_RELA
 	select CLONE_BACKWARDS
 	select GENERIC_SIGALTSTACK
+	select GENERIC_COMPAT_RT_SIGACTION
 	select GENERIC_COMPAT_RT_SIGQUEUEINFO
 	select GENERIC_COMPAT_RT_SIGPROCMASK
 	select GENERIC_COMPAT_RT_SIGPENDING

arch/powerpc/kernel/ppc32.h

@@ -25,15 +25,6 @@ struct __old_sigaction32 {
 	compat_uptr_t		sa_restorer;     /* not used by Linux/SPARC yet */
 };
 
-
-
-struct sigaction32 {
-       compat_uptr_t  sa_handler;	/* Really a pointer, but need to deal with 32 bits */
-       unsigned int sa_flags;
-       compat_uptr_t sa_restorer;	/* Another 32 bit pointer */
-       compat_sigset_t sa_mask;		/* A 32 bit mask */
-};
-
 struct pt_regs32 {
 	unsigned int gpr[32];
 	unsigned int nip;

arch/powerpc/kernel/signal_32.c

@@ -579,36 +579,6 @@ static long restore_user_regs(struct pt_regs *regs,
 }
 
 #ifdef CONFIG_PPC64
-long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act,
-		struct sigaction32 __user *oact, size_t sigsetsize)
-{
-	struct k_sigaction new_ka, old_ka;
-	int ret;
-
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(compat_sigset_t))
-		return -EINVAL;
-
-	if (act) {
-		compat_uptr_t handler;
-
-		ret = get_user(handler, &act->sa_handler);
-		new_ka.sa.sa_handler = compat_ptr(handler);
-		ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
-		ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
-		if (ret)
-			return -EFAULT;
-	}
-
-	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-	if (!ret && oact) {
-		ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler);
-		ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
-		ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
-	}
-	return ret;
-}
-
 int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
 {
 	int err;