switch mips to generic rt_sigsuspend(), make it unconditional

mips was the last architecture not using the generic variant.
Both native and compat variants switched to generic, which is
made unconditional now.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

arch/mips/kernel/scall64-n32.S

@@ -232,7 +232,7 @@ EXPORT(sysn32_call_table)
 	PTR	sys_32_rt_sigpending		/* 6125 */
 	PTR	compat_sys_rt_sigtimedwait
 	PTR	sys_32_rt_sigqueueinfo
-	PTR	sysn32_rt_sigsuspend
+	PTR	compat_sys_rt_sigsuspend
 	PTR	compat_sys_sigaltstack
 	PTR	compat_sys_utime		/* 6130 */
 	PTR	sys_mknod

arch/mips/kernel/scall64-o32.S

@@ -391,7 +391,7 @@ sys_call_table:
 	PTR	sys_32_rt_sigpending
 	PTR	compat_sys_rt_sigtimedwait
 	PTR	sys_32_rt_sigqueueinfo
-	PTR	sys32_rt_sigsuspend
+	PTR	compat_sys_rt_sigsuspend
 	PTR	sys_32_pread			/* 4200 */
 	PTR	sys_32_pwrite
 	PTR	sys_chown

arch/mips/kernel/signal.c

@@ -259,19 +259,6 @@ asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
 }
 #endif
 
-SYSCALL_DEFINE2(rt_sigsuspend, sigset_t __user *,unewset, size_t, sigsetsize)
-{
-	sigset_t newset;
-
-	/* XXX Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(sigset_t))
-		return -EINVAL;
-
-	if (copy_from_user(&newset, unewset, sizeof(newset)))
-		return -EFAULT;
-	return sigsuspend(&newset);
-}
-
 #ifdef CONFIG_TRAD_SIGNALS
 SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
 	struct sigaction __user *, oact)

arch/mips/kernel/signal32.c

@@ -284,23 +284,6 @@ asmlinkage int sys32_sigsuspend(nabi_no_regargs struct pt_regs regs)
 	return sigsuspend(&newset);
 }
 
-asmlinkage int sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
-{
-	compat_sigset_t __user *uset;
-	sigset_t newset;
-	size_t sigsetsize;
-
-	/* XXX Don't preclude handling different sized sigset_t's.  */
-	sigsetsize = regs.regs[5];
-	if (sigsetsize != sizeof(compat_sigset_t))
-		return -EINVAL;
-
-	uset = (compat_sigset_t __user *) regs.regs[4];
-	if (get_sigset(&newset, uset))
-		return -EFAULT;
-	return sigsuspend(&newset);
-}
-
 SYSCALL_DEFINE3(32_sigaction, long, sig, const struct sigaction32 __user *, act,
 	struct sigaction32 __user *, oact)
 {

arch/mips/kernel/signal_n32.c

@@ -65,27 +65,6 @@ struct rt_sigframe_n32 {
 	struct ucontextn32 rs_uc;
 };
 
-extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
-
-asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
-{
-	compat_sigset_t __user *unewset;
-	compat_sigset_t uset;
-	size_t sigsetsize;
-	sigset_t newset;
-
-	/* XXX Don't preclude handling different sized sigset_t's.  */
-	sigsetsize = regs.regs[5];
-	if (sigsetsize != sizeof(sigset_t))
-		return -EINVAL;
-
-	unewset = (compat_sigset_t __user *) regs.regs[4];
-	if (copy_from_user(&uset, unewset, sizeof(uset)))
-		return -EFAULT;
-	sigset_from_compat(&newset, &uset);
-	return sigsuspend(&newset);
-}
-
 asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
 {
 	struct rt_sigframe_n32 __user *frame;

kernel/signal.c

@@ -3562,7 +3562,6 @@ int sigsuspend(sigset_t *set)
 	return -ERESTARTNOHAND;
 }
 
-#ifdef __ARCH_WANT_SYS_RT_SIGSUSPEND
 /**
  *  sys_rt_sigsuspend - replace the signal mask for a value with the
  *	@unewset value until a signal is received
@@ -3603,7 +3602,6 @@ COMPAT_SYSCALL_DEFINE2(rt_sigsuspend, compat_sigset_t __user *, unewset, compat_
 #endif
 }
 #endif
-#endif
 
 #ifdef CONFIG_OLD_SIGSUSPEND
 SYSCALL_DEFINE1(sigsuspend, old_sigset_t, mask)