signal/timer/event: signalfd wire up x86 arches

This patch wires the signalfd system call to the x86 architectures.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/asm-x86_64/unistd.h b/include/asm-x86_64/unistd.h
index 18a0b01..e12fb1a 100644
--- a/include/asm-x86_64/unistd.h
+++ b/include/asm-x86_64/unistd.h
@@ -624,6 +624,8 @@
 #define __IGNORE_getcpu		/* implemented as a vsyscall */
 #define __NR_epoll_pwait	281
 __SYSCALL(__NR_epoll_pwait, sys_epoll_pwait)
+#define __NR_signalfd		282
+__SYSCALL(__NR_signalfd, sys_signalfd)
 
 #ifndef __NO_STUBS
 #define __ARCH_WANT_OLD_READDIR