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 [email protected]
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 <[email protected]>
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);
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