From: Christopher Hoover <ch@murgatroid.com>
Here's a patch to drop some more text/data/bss out of 2.5. This time
the ``victim'' is eventpollfs (epoll).
fs/Makefile | 4 +++-
include/linux/eventpoll.h | 9 +++++++++
init/Kconfig | 7 +++++++
kernel/sys.c | 3 +++
4 files changed, 22 insertions(+), 1 deletion(-)
diff -puN fs/Makefile~CONFIG_EPOLL fs/Makefile
--- 25/fs/Makefile~CONFIG_EPOLL 2003-05-17 01:54:11.000000000 -0700
+++ 25-akpm/fs/Makefile 2003-05-17 01:54:11.000000000 -0700
@@ -10,7 +10,9 @@ obj-y := open.o read_write.o file_table.
namei.o fcntl.o ioctl.o readdir.o select.o fifo.o locks.o \
dcache.o inode.o attr.o bad_inode.o file.o dnotify.o \
filesystems.o namespace.o seq_file.o xattr.o libfs.o \
- fs-writeback.o mpage.o direct-io.o aio.o eventpoll.o
+ fs-writeback.o mpage.o direct-io.o aio.o
+
+obj-$(CONFIG_EPOLL) += eventpoll.o
obj-$(CONFIG_COMPAT) += compat.o
diff -puN include/linux/eventpoll.h~CONFIG_EPOLL include/linux/eventpoll.h
--- 25/include/linux/eventpoll.h~CONFIG_EPOLL 2003-05-17 01:54:11.000000000 -0700
+++ 25-akpm/include/linux/eventpoll.h 2003-05-17 01:54:11.000000000 -0700
@@ -40,12 +40,21 @@ asmlinkage long sys_epoll_ctl(int epfd,
asmlinkage long sys_epoll_wait(int epfd, struct epoll_event *events, int maxevents,
int timeout);
+#ifdef CONFIG_EPOLL
+
/* Used to initialize the epoll bits inside the "struct file" */
void eventpoll_init_file(struct file *file);
/* Used in fs/file_table.c:__fput() to unlink files from the eventpoll interface */
void eventpoll_release(struct file *file);
+#else
+
+static inline void eventpoll_init_file(struct file *file) {}
+static inline void eventpoll_release(struct file *file) {}
+
+#endif
+
#endif /* #ifdef __KERNEL__ */
#endif /* #ifndef _LINUX_EVENTPOLL_H */
diff -puN init/Kconfig~CONFIG_EPOLL init/Kconfig
--- 25/init/Kconfig~CONFIG_EPOLL 2003-05-17 01:54:11.000000000 -0700
+++ 25-akpm/init/Kconfig 2003-05-17 01:54:42.000000000 -0700
@@ -125,6 +125,13 @@ config FUTEX
support for "fast userspace mutexes". The resulting kernel may not
run glibc-based applications correctly.
+config EPOLL
+ bool "Enable eventpoll support" if EMBEDDED
+ default y
+ help
+ Disabling this option will cause the kernel to be built without
+ support for epoll family of system calls.
+
endmenu # General setup
diff -puN kernel/sys.c~CONFIG_EPOLL kernel/sys.c
--- 25/kernel/sys.c~CONFIG_EPOLL 2003-05-17 01:54:11.000000000 -0700
+++ 25-akpm/kernel/sys.c 2003-05-17 01:54:11.000000000 -0700
@@ -230,6 +230,9 @@ cond_syscall(sys_recvmsg)
cond_syscall(sys_socketcall)
cond_syscall(sys_futex)
cond_syscall(compat_sys_futex)
+cond_syscall(sys_epoll_create)
+cond_syscall(sys_epoll_ctl)
+cond_syscall(sys_epoll_wait)
static int set_one_prio(struct task_struct *p, int niceval, int error)
{
_