[PATCH] 2.6.14-rc5 fails to build with out CONFIG_FUTEX

[George Anzinger]

Both kernel/exit.c and fs/dcache.c refer to functions in kernel/futex.c which is not built unless 
CONFIG_FUTEX is true.  This causes a build failure at link time:
  LD      vmlinux
kernel/built-in.o(.text+0xab58): In function `do_exit':
/usr/src/linux-2.6.14-rc/kernel/exit.c:851: undefined reference to `exit_futex'
fs/built-in.o(.text+0x1b2bf): In function `dput':
/usr/src/linux-2.6.14-rc/fs/dcache.c:165: undefined reference to `futex_free_robust_list'

Attached patch "defines" away the problem.
--
George Anzinger   george@xxxxxxxxxx
HRT (High-res-timers):  http://sourceforge.net/projects/high-res-timers/
Source: MontaVista Software, Inc.

Type: Defect Fix 
Description:
CONFIG_FUTEX is an option but kernel/exit.c and fs/dcache.c refer to functions in kernel/futux.c unconditionally.  This patch ties those request off and allows a build with CONFIG_FUTEX  "not set".

Signed-off-by: George Anzinger <george@xxxxxxxxxx>

 include/linux/futex.h |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletion(-)

Index: linux-2.6.14-rc/include/linux/futex.h
===================================================================
--- linux-2.6.14-rc.orig/include/linux/futex.h
+++ linux-2.6.14-rc/include/linux/futex.h
@@ -35,9 +35,13 @@
 long do_futex(unsigned long uaddr, int op, int val,
 		unsigned long timeout, unsigned long uaddr2, int val2,
 		int val3);
-
+#ifdef CONFIG_FUTEX
 extern void futex_free_robust_list(struct inode *inode);
 extern void exit_futex(struct task_struct *tsk);
+#else
+#define futex_free_robust_list(a)
+#define exit_futex(b)
+#endif
 static inline void futex_init_inode(struct inode *inode)
 {
 	INIT_LIST_HEAD(&inode->i_data.robust_list);