Configure out AIO support

This patchs adds the CONFIG_AIO option which allows to remove support
for asynchronous I/O operations, that are not necessarly used by
applications, particularly on embedded devices. As this is a
size-reduction option, it depends on CONFIG_EMBEDDED. It allows to
save ~7 kilobytes of kernel code/data:

   text	   data	    bss	    dec	    hex	filename
1115067	 119180	 217088	1451335	 162547	vmlinux
1108025	 119048	 217088	1444161	 160941	vmlinux.new
  -7042    -132       0   -7174   -1C06 +/-

This patch has been originally written by Matt Mackall
<mpm@selenic.com>, and is part of the Linux Tiny project.

[randy.dunlap@oracle.com: build fix]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Zach Brown <zach.brown@oracle.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/Makefile b/fs/Makefile
index b6f27dc..d0c69f5 100644 (file)
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -8,7 +8,7 @@
 obj-y :=       open.o read_write.o file_table.o super.o \
                char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \
                ioctl.o readdir.o select.o fifo.o dcache.o inode.o \
-               attr.o bad_inode.o file.o filesystems.o namespace.o aio.o \
+               attr.o bad_inode.o file.o filesystems.o namespace.o \
                seq_file.o xattr.o libfs.o fs-writeback.o \
                pnode.o drop_caches.o splice.o sync.o utimes.o \
                stack.o
@@ -27,6 +27,7 @@ obj-$(CONFIG_ANON_INODES)     += anon_inodes.o
 obj-$(CONFIG_SIGNALFD)         += signalfd.o
 obj-$(CONFIG_TIMERFD)          += timerfd.o
 obj-$(CONFIG_EVENTFD)          += eventfd.o
+obj-$(CONFIG_AIO)               += aio.o
 obj-$(CONFIG_FILE_LOCKING)      += locks.o
 obj-$(CONFIG_COMPAT)           += compat.o compat_ioctl.o
 

diff --git a/include/linux/aio.h b/include/linux/aio.h
index 09b276c..f6b8cf9 100644 (file)
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -204,12 +204,21 @@ struct kioctx {
 /* prototypes */
 extern unsigned aio_max_size;
 
+#ifdef CONFIG_AIO
 extern ssize_t wait_on_sync_kiocb(struct kiocb *iocb);
 extern int aio_put_req(struct kiocb *iocb);
 extern void kick_iocb(struct kiocb *iocb);
 extern int aio_complete(struct kiocb *iocb, long res, long res2);
 struct mm_struct;
 extern void exit_aio(struct mm_struct *mm);
+#else
+static inline ssize_t wait_on_sync_kiocb(struct kiocb *iocb) { return 0; }
+static inline int aio_put_req(struct kiocb *iocb) { return 0; }
+static inline void kick_iocb(struct kiocb *iocb) { }
+static inline int aio_complete(struct kiocb *iocb, long res, long res2) { return 0; }
+struct mm_struct;
+static inline void exit_aio(struct mm_struct *mm) { }
+#endif /* CONFIG_AIO */
 
 #define io_wait_to_kiocb(wait) container_of(wait, struct kiocb, ki_wait)
 

diff --git a/init/Kconfig b/init/Kconfig
index 8a8e2d0..5ceff32 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -713,6 +713,14 @@ config SHMEM
          option replaces shmem and tmpfs with the much simpler ramfs code,
          which may be appropriate on small systems without swap.
 
+config AIO
+       bool "Enable AIO support" if EMBEDDED
+       default y
+       help
+         This option enables POSIX asynchronous I/O which may by used
+          by some high performance threaded applications. Disabling
+          this option saves about 7k.
+
 config VM_EVENT_COUNTERS
        default y
        bool "Enable VM event counters for /proc/vmstat" if EMBEDDED

diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 503d8d4..a77b27b 100644 (file)
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -126,6 +126,11 @@ cond_syscall(sys_vm86);
 cond_syscall(compat_sys_ipc);
 cond_syscall(compat_sys_sysctl);
 cond_syscall(sys_flock);
+cond_syscall(sys_io_setup);
+cond_syscall(sys_io_destroy);
+cond_syscall(sys_io_submit);
+cond_syscall(sys_io_cancel);
+cond_syscall(sys_io_getevents);
 
 /* arch-specific weak syscall entries */
 cond_syscall(sys_pciconfig_read);

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 9792c31..617d41e 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1281,6 +1281,7 @@ static struct ctl_table fs_table[] = {
                .extra2         = &two,
        },
 #endif
+#ifdef CONFIG_AIO
        {
                .procname       = "aio-nr",
                .data           = &aio_nr,
@@ -1295,6 +1296,7 @@ static struct ctl_table fs_table[] = {
                .mode           = 0644,
                .proc_handler   = &proc_doulongvec_minmax,
        },
+#endif /* CONFIG_AIO */
 #ifdef CONFIG_INOTIFY_USER
        {
                .ctl_name       = FS_INOTIFY,