From: Andreas Herrmann Fix compile error if !CONFIG_SYSCTL: ... LD .tmp_vmlinux1 net/built-in.o: In function `init_p9': net/9p/mod.c:59: undefined reference to `p9_sysctl_register' net/built-in.o: In function `exit_p9': net/9p/mod.c:75: undefined reference to `p9_sysctl_unregister' make: *** [.tmp_vmlinux1] Error 1 ... Signed-off-by: Andreas Herrmann Cc: Eric Van Hensbergen Signed-off-by: Andrew Morton --- 9p/mod.c | 0 include/net/9p/9p.h | 12 ++++++++++++ 2 files changed, 12 insertions(+) diff -puN include/net/9p/9p.h~9p-fix-compile-error-if-config_sysctl include/net/9p/9p.h --- a/include/net/9p/9p.h~9p-fix-compile-error-if-config_sysctl +++ a/include/net/9p/9p.h @@ -412,6 +412,18 @@ int p9_idpool_check(int id, struct p9_id int p9_error_init(void); int p9_errstr2errno(char *, int); +#ifdef CONFIG_SYSCTL int __init p9_sysctl_register(void); void __exit p9_sysctl_unregister(void); +#else +static inline int p9_sysctl_register(void) +{ + return 0; +} + +static inline void p9_sysctl_unregister(void) +{ +} +#endif + #endif /* NET_9P_H */ diff -puN net/9p/mod.c~9p-fix-compile-error-if-config_sysctl net/9p/mod.c _