[patch] signalfd: fix undefined reference to `compat_sys_signalfd4'

* Ulrich Drepper [off-list ref] wrote:

This patch adds the new signalfd4 syscall.  It extends the old 
signalfd syscall by one parameter which is meant to hold a flag value.  
In this patch the only flag support is SFD_CLOEXEC which causes the 
close-on-exec flag for the returned file descriptor to be set.

this patch causes the following build failure on !CONFIG_SIGNALFD:

 arch/x86/ia32/built-in.o: In function `ia32_sys_call_table':
 (.rodata+0xa38): undefined reference to `compat_sys_signalfd4'
 make: *** [.tmp_vmlinux1] Error 1

tested fix below.

	Ingo

-------------->

From 72dc5d608422e80ad5e1aac2d7b9bd16b7dbc6e0 Mon Sep 17 00:00:00 2001

From: Ingo Molnar <redacted>
Date: Fri, 25 Jul 2008 13:02:37 +0200
Subject: [PATCH] signalfd: fix undefined reference to `compat_sys_signalfd4'

fix:

arch/x86/ia32/built-in.o: In function `ia32_sys_call_table':
(.rodata+0xa38): undefined reference to `compat_sys_signalfd4'

on !CONFIG_SIGNALFD.

Signed-off-by: Ingo Molnar <redacted>
---
 kernel/sys_ni.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 55eca15..08d6e1b 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c

@@ -160,6 +160,7 @@ cond_syscall(sys_ioprio_get);
 cond_syscall(sys_signalfd);
 cond_syscall(sys_signalfd4);
 cond_syscall(compat_sys_signalfd);
+cond_syscall(compat_sys_signalfd4);
 cond_syscall(sys_timerfd_create);
 cond_syscall(sys_timerfd_settime);
 cond_syscall(sys_timerfd_gettime);