# CONFIG_DEVPTS_MULTIPLE_INSTANCES is not set
# CONFIG_DEVTMPFS is not set
# CONFIG_DEVTMPFS_MOUNT is not set
+# CONFIG_DIRECT_IO is not set
# CONFIG_DISCONTIGMEM_MANUAL is not set
# CONFIG_DISPLAY_SUPPORT is not set
# CONFIG_DL2K is not set
CONFIG_PROC_FS=y
# CONFIG_PROC_KCORE is not set
# CONFIG_PROC_PAGE_MONITOR is not set
+CONFIG_PROC_STRIPPED=y
CONFIG_PROC_SYSCTL=y
# CONFIG_PROFILE_ALL_BRANCHES is not set
# CONFIG_PROFILE_ANNOTATED_BRANCHES is not set
# CONFIG_DEVTMPFS is not set
# CONFIG_DEVTMPFS_MOUNT is not set
# CONFIG_DGRP is not set
+# CONFIG_DIRECT_IO is not set
# CONFIG_DISCONTIGMEM_MANUAL is not set
# CONFIG_DISPLAY_SUPPORT is not set
# CONFIG_DL2K is not set
CONFIG_PROC_FS=y
# CONFIG_PROC_KCORE is not set
# CONFIG_PROC_PAGE_MONITOR is not set
+CONFIG_PROC_STRIPPED=y
CONFIG_PROC_SYSCTL=y
# CONFIG_PROFILE_ALL_BRANCHES is not set
# CONFIG_PROFILE_ANNOTATED_BRANCHES is not set
--- /dev/null
+--- a/net/Kconfig
++++ b/net/Kconfig
+@@ -85,6 +85,9 @@ source "net/netlabel/Kconfig"
+
+ endif # if INET
+
++config SOCK_DIAG
++ bool
++
+ config NETWORK_SECMARK
+ bool "Security Marking"
+ help
+--- a/net/core/Makefile
++++ b/net/core/Makefile
+@@ -8,9 +8,9 @@ obj-y := sock.o request_sock.o skbuff.o
+ obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
+
+ obj-y += dev.o ethtool.o dev_addr_lists.o dst.o netevent.o \
+- neighbour.o rtnetlink.o utils.o link_watch.o filter.o \
+- sock_diag.o
++ neighbour.o rtnetlink.o utils.o link_watch.o filter.o
+
++obj-$(CONFIG_SOCK_DIAG) += sock_diag.o
+ obj-$(CONFIG_XFRM) += flow.o
+ obj-y += net-sysfs.o
+ obj-$(CONFIG_NET_PKTGEN) += pktgen.o
+--- a/net/ipv4/Kconfig
++++ b/net/ipv4/Kconfig
+@@ -404,6 +404,7 @@ config INET_LRO
+
+ config INET_DIAG
+ tristate "INET: socket monitoring interface"
++ select SOCK_DIAG
+ default y
+ ---help---
+ Support for INET (TCP, DCCP, etc) socket monitoring interface used by
+--- a/net/unix/Kconfig
++++ b/net/unix/Kconfig
+@@ -22,6 +22,7 @@ config UNIX
+ config UNIX_DIAG
+ tristate "UNIX: socket monitoring interface"
+ depends on UNIX
++ select SOCK_DIAG
+ default n
+ ---help---
+ Support for UNIX socket monitoring interface used by the ss tool.
--- /dev/null
+--- a/fs/locks.c
++++ b/fs/locks.c
+@@ -2269,6 +2269,8 @@ static const struct file_operations proc
+
+ static int __init proc_locks_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ proc_create("locks", 0, NULL, &proc_locks_operations);
+ return 0;
+ }
+--- a/fs/proc/Kconfig
++++ b/fs/proc/Kconfig
+@@ -67,3 +67,8 @@ config PROC_PAGE_MONITOR
+ /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
+ /proc/kpagecount, and /proc/kpageflags. Disabling these
+ interfaces will reduce the size of the kernel by approximately 4kb.
++
++config PROC_STRIPPED
++ default n
++ depends on EXPERT
++ bool "Strip non-essential /proc functionality to reduce code size"
+--- a/fs/proc/consoles.c
++++ b/fs/proc/consoles.c
+@@ -108,6 +108,9 @@ static const struct file_operations proc
+
+ static int __init proc_consoles_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
++
+ proc_create("consoles", 0, NULL, &proc_consoles_operations);
+ return 0;
+ }
+--- a/fs/proc/proc_tty.c
++++ b/fs/proc/proc_tty.c
+@@ -143,7 +143,10 @@ static const struct file_operations proc
+ void proc_tty_register_driver(struct tty_driver *driver)
+ {
+ struct proc_dir_entry *ent;
+-
++
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ if (!driver->driver_name || driver->proc_entry ||
+ !driver->ops->proc_fops)
+ return;
+@@ -160,6 +163,9 @@ void proc_tty_unregister_driver(struct t
+ {
+ struct proc_dir_entry *ent;
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ ent = driver->proc_entry;
+ if (!ent)
+ return;
+@@ -174,6 +180,9 @@ void proc_tty_unregister_driver(struct t
+ */
+ void __init proc_tty_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ if (!proc_mkdir("tty", NULL))
+ return;
+ proc_tty_ldisc = proc_mkdir("tty/ldisc", NULL);
+--- a/kernel/exec_domain.c
++++ b/kernel/exec_domain.c
+@@ -173,6 +173,8 @@ static const struct file_operations exec
+
+ static int __init proc_execdomains_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ proc_create("execdomains", 0, NULL, &execdomains_proc_fops);
+ return 0;
+ }
+--- a/kernel/irq/proc.c
++++ b/kernel/irq/proc.c
+@@ -311,6 +311,9 @@ void register_irq_proc(unsigned int irq,
+ {
+ char name [MAX_NAMELEN];
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip) || desc->dir)
+ return;
+
+@@ -347,6 +350,9 @@ void unregister_irq_proc(unsigned int ir
+ {
+ char name [MAX_NAMELEN];
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ if (!root_irq_dir || !desc->dir)
+ return;
+ #ifdef CONFIG_SMP
+@@ -386,6 +392,9 @@ void init_irq_proc(void)
+ unsigned int irq;
+ struct irq_desc *desc;
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ /* create /proc/irq */
+ root_irq_dir = proc_mkdir("irq", NULL);
+ if (!root_irq_dir)
+--- a/kernel/time/timer_list.c
++++ b/kernel/time/timer_list.c
+@@ -293,6 +293,8 @@ static int __init init_timer_list_procfs
+ {
+ struct proc_dir_entry *pe;
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
+ if (!pe)
+ return -ENOMEM;
+--- a/mm/vmalloc.c
++++ b/mm/vmalloc.c
+@@ -2641,6 +2641,8 @@ static const struct file_operations proc
+
+ static int __init proc_vmalloc_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
+ return 0;
+ }
+--- a/mm/vmstat.c
++++ b/mm/vmstat.c
+@@ -1212,10 +1212,12 @@ static int __init setup_vmstat(void)
+ start_cpu_timer(cpu);
+ #endif
+ #ifdef CONFIG_PROC_FS
+- proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
+- proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
++ proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
++ proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
++ proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
++ }
+ proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
+- proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
+ #endif
+ return 0;
+ }
+--- a/net/8021q/vlanproc.c
++++ b/net/8021q/vlanproc.c
+@@ -127,6 +127,9 @@ void vlan_proc_cleanup(struct net *net)
+ {
+ struct vlan_net *vn = net_generic(net, vlan_net_id);
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ if (vn->proc_vlan_conf)
+ remove_proc_entry(name_conf, vn->proc_vlan_dir);
+
+@@ -146,6 +149,9 @@ int __net_init vlan_proc_init(struct net
+ {
+ struct vlan_net *vn = net_generic(net, vlan_net_id);
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
++
+ vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net);
+ if (!vn->proc_vlan_dir)
+ goto err;
+--- a/net/core/dev.c
++++ b/net/core/dev.c
+@@ -4425,9 +4425,11 @@ static int __net_init dev_proc_net_init(
+
+ if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
+ goto out;
+- if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
++ !proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
+ goto out_dev;
+- if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
++ !proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
+ goto out_softnet;
+
+ if (wext_proc_init(net))
+@@ -4436,9 +4438,11 @@ static int __net_init dev_proc_net_init(
+ out:
+ return rc;
+ out_ptype:
+- proc_net_remove(net, "ptype");
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
++ proc_net_remove(net, "ptype");
+ out_softnet:
+- proc_net_remove(net, "softnet_stat");
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
++ proc_net_remove(net, "softnet_stat");
+ out_dev:
+ proc_net_remove(net, "dev");
+ goto out;
+@@ -4448,8 +4452,10 @@ static void __net_exit dev_proc_net_exit
+ {
+ wext_proc_exit(net);
+
+- proc_net_remove(net, "ptype");
+- proc_net_remove(net, "softnet_stat");
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
++ proc_net_remove(net, "ptype");
++ proc_net_remove(net, "softnet_stat");
++ }
+ proc_net_remove(net, "dev");
+ }
+
+--- a/net/core/sock.c
++++ b/net/core/sock.c
+@@ -2748,6 +2748,8 @@ static __net_initdata struct pernet_oper
+
+ static int __init proto_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ return register_pernet_subsys(&proto_net_ops);
+ }
+
+--- a/net/ipv4/fib_trie.c
++++ b/net/ipv4/fib_trie.c
+@@ -2604,10 +2604,12 @@ static const struct file_operations fib_
+
+ int __net_init fib_proc_init(struct net *net)
+ {
+- if (!proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops))
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
++ !proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops))
+ goto out1;
+
+- if (!proc_net_fops_create(net, "fib_triestat", S_IRUGO,
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
++ !proc_net_fops_create(net, "fib_triestat", S_IRUGO,
+ &fib_triestat_fops))
+ goto out2;
+
+@@ -2626,8 +2628,10 @@ out1:
+
+ void __net_exit fib_proc_exit(struct net *net)
+ {
+- proc_net_remove(net, "fib_trie");
+- proc_net_remove(net, "fib_triestat");
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
++ proc_net_remove(net, "fib_trie");
++ proc_net_remove(net, "fib_triestat");
++ }
+ proc_net_remove(net, "route");
+ }
+
+--- a/net/ipv4/igmp.c
++++ b/net/ipv4/igmp.c
+@@ -2661,6 +2661,8 @@ static struct pernet_operations igmp_net
+
+ int __init igmp_mc_proc_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ return register_pernet_subsys(&igmp_net_ops);
+ }
+ #endif
+--- a/net/ipv4/ipmr.c
++++ b/net/ipv4/ipmr.c
+@@ -70,6 +70,10 @@
+ #define CONFIG_IP_PIMSM 1
+ #endif
+
++#ifdef CONFIG_PROC_STRIPPED
++#undef CONFIG_PROC_FS
++#endif
++
+ struct mr_table {
+ struct list_head list;
+ #ifdef CONFIG_NET_NS
+--- a/net/ipv4/proc.c
++++ b/net/ipv4/proc.c
+@@ -498,6 +498,9 @@ static __net_initdata struct pernet_oper
+
+ int __init ip_misc_proc_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
++
+ return register_pernet_subsys(&ip_proc_ops);
+ }
+
+--- a/net/ipv4/route.c
++++ b/net/ipv4/route.c
+@@ -427,6 +427,9 @@ static struct pernet_operations ip_rt_pr
+
+ static int __init ip_rt_proc_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
++
+ return register_pernet_subsys(&ip_rt_proc_ops);
+ }
+
+--- a/ipc/msg.c
++++ b/ipc/msg.c
+@@ -135,6 +135,9 @@ void __init msg_init(void)
+ printk(KERN_INFO "msgmni has been set to %d\n",
+ init_ipc_ns.msg_ctlmni);
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ ipc_init_proc_interface("sysvipc/msg",
+ " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
+ IPC_MSG_IDS, sysvipc_msg_proc_show);
+--- a/ipc/sem.c
++++ b/ipc/sem.c
+@@ -185,6 +185,8 @@ void sem_exit_ns(struct ipc_namespace *n
+ void __init sem_init (void)
+ {
+ sem_init_ns(&init_ipc_ns);
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
+ ipc_init_proc_interface("sysvipc/sem",
+ " key semid perms nsems uid gid cuid cgid otime ctime\n",
+ IPC_SEM_IDS, sysvipc_sem_proc_show);
+--- a/ipc/shm.c
++++ b/ipc/shm.c
+@@ -115,6 +115,8 @@ pure_initcall(ipc_ns_init);
+
+ void __init shm_init (void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
+ ipc_init_proc_interface("sysvipc/shm",
+ #if BITS_PER_LONG <= 32
+ " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap\n",
+--- a/ipc/util.c
++++ b/ipc/util.c
+@@ -148,6 +148,9 @@ void __init ipc_init_proc_interface(cons
+ struct proc_dir_entry *pde;
+ struct ipc_proc_iface *iface;
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ iface = kmalloc(sizeof(*iface), GFP_KERNEL);
+ if (!iface)
+ return;
--- /dev/null
+--- a/fs/Kconfig
++++ b/fs/Kconfig
+@@ -62,6 +62,11 @@ config FILE_LOCKING
+ for filesystems like NFS and for the flock() system
+ call. Disabling this option saves about 11k.
+
++config DIRECT_IO
++ bool "Enable O_DIRECT support" if EXPERT
++ depends on BLOCK
++ default y
++
+ source "fs/notify/Kconfig"
+
+ source "fs/quota/Kconfig"
+--- a/fs/Makefile
++++ b/fs/Makefile
+@@ -14,7 +14,8 @@ obj-y := open.o read_write.o file_table.
+ stack.o fs_struct.o statfs.o
+
+ ifeq ($(CONFIG_BLOCK),y)
+-obj-y += buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o
++obj-y += buffer.o bio.o block_dev.o mpage.o ioprio.o
++obj-$(CONFIG_DIRECT_IO) += direct-io.o
+ else
+ obj-y += no-block.o
+ endif
+--- a/include/linux/fs.h
++++ b/include/linux/fs.h
+@@ -2632,20 +2632,36 @@ enum {
+ DIO_SKIP_HOLES = 0x02,
+ };
+
++#ifdef CONFIG_DIRECT_IO
+ void dio_end_io(struct bio *bio, int error);
+
+ ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
+ struct block_device *bdev, const struct iovec *iov, loff_t offset,
+ unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
+ dio_submit_t submit_io, int flags);
++#else
++static inline void dio_end_io(struct bio *bio, int error)
++{
++}
++static inline ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
++ struct block_device *bdev, const struct iovec *iov, loff_t offset,
++ unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
++ dio_submit_t submit_io, int flags)
++{
++ return -EOPNOTSUPP;
++}
++#endif
++
+
+ static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
+ struct inode *inode, const struct iovec *iov, loff_t offset,
+ unsigned long nr_segs, get_block_t get_block)
+ {
++#ifdef CONFIG_DIRECT_IO
+ return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+ offset, nr_segs, get_block, NULL, NULL,
+ DIO_LOCKING | DIO_SKIP_HOLES);
++#endif
+ }
+ #endif
+
+--- a/fs/fcntl.c
++++ b/fs/fcntl.c
+@@ -169,8 +169,10 @@ static int setfl(int fd, struct file * f
+ arg |= O_NONBLOCK;
+
+ if (arg & O_DIRECT) {
++#ifdef CONFIG_DIRECT_IO
+ if (!filp->f_mapping || !filp->f_mapping->a_ops ||
+ !filp->f_mapping->a_ops->direct_IO)
++#endif
+ return -EINVAL;
+ }
+
+--- a/fs/open.c
++++ b/fs/open.c
+@@ -636,9 +636,12 @@ int open_check_o_direct(struct file *f)
+ {
+ /* NB: we're sure to have correct a_ops only after f_op->open */
+ if (f->f_flags & O_DIRECT) {
++#ifdef CONFIG_DIRECT_IO
+ if (!f->f_mapping->a_ops ||
+ ((!f->f_mapping->a_ops->direct_IO) &&
+- (!f->f_mapping->a_ops->get_xip_mem))) {
++ (!f->f_mapping->a_ops->get_xip_mem)))
++#endif
++ {
+ return -EINVAL;
+ }
+ }
--- /dev/null
+--- a/net/Kconfig
++++ b/net/Kconfig
+@@ -87,6 +87,9 @@ source "net/netlabel/Kconfig"
+
+ endif # if INET
+
++config SOCK_DIAG
++ bool
++
+ config NETWORK_SECMARK
+ bool "Security Marking"
+ help
+--- a/net/core/Makefile
++++ b/net/core/Makefile
+@@ -8,9 +8,9 @@ obj-y := sock.o request_sock.o skbuff.o
+ obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
+
+ obj-y += dev.o ethtool.o dev_addr_lists.o dst.o netevent.o \
+- neighbour.o rtnetlink.o utils.o link_watch.o filter.o \
+- sock_diag.o
++ neighbour.o rtnetlink.o utils.o link_watch.o filter.o
+
++obj-$(CONFIG_SOCK_DIAG) += sock_diag.o
+ obj-$(CONFIG_XFRM) += flow.o
+ obj-y += net-sysfs.o
+ obj-$(CONFIG_NET_PKTGEN) += pktgen.o
+--- a/net/ipv4/Kconfig
++++ b/net/ipv4/Kconfig
+@@ -404,6 +404,7 @@ config INET_LRO
+
+ config INET_DIAG
+ tristate "INET: socket monitoring interface"
++ select SOCK_DIAG
+ default y
+ ---help---
+ Support for INET (TCP, DCCP, etc) socket monitoring interface used by
+--- a/net/unix/Kconfig
++++ b/net/unix/Kconfig
+@@ -22,6 +22,7 @@ config UNIX
+ config UNIX_DIAG
+ tristate "UNIX: socket monitoring interface"
+ depends on UNIX
++ select SOCK_DIAG
+ default n
+ ---help---
+ Support for UNIX socket monitoring interface used by the ss tool.
--- /dev/null
+--- a/fs/locks.c
++++ b/fs/locks.c
+@@ -2267,6 +2267,8 @@ static const struct file_operations proc
+
+ static int __init proc_locks_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ proc_create("locks", 0, NULL, &proc_locks_operations);
+ return 0;
+ }
+--- a/fs/proc/Kconfig
++++ b/fs/proc/Kconfig
+@@ -67,3 +67,8 @@ config PROC_PAGE_MONITOR
+ /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
+ /proc/kpagecount, and /proc/kpageflags. Disabling these
+ interfaces will reduce the size of the kernel by approximately 4kb.
++
++config PROC_STRIPPED
++ default n
++ depends on EXPERT
++ bool "Strip non-essential /proc functionality to reduce code size"
+--- a/fs/proc/consoles.c
++++ b/fs/proc/consoles.c
+@@ -108,6 +108,9 @@ static const struct file_operations proc
+
+ static int __init proc_consoles_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
++
+ proc_create("consoles", 0, NULL, &proc_consoles_operations);
+ return 0;
+ }
+--- a/fs/proc/proc_tty.c
++++ b/fs/proc/proc_tty.c
+@@ -143,7 +143,10 @@ static const struct file_operations proc
+ void proc_tty_register_driver(struct tty_driver *driver)
+ {
+ struct proc_dir_entry *ent;
+-
++
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ if (!driver->driver_name || driver->proc_entry ||
+ !driver->ops->proc_fops)
+ return;
+@@ -160,6 +163,9 @@ void proc_tty_unregister_driver(struct t
+ {
+ struct proc_dir_entry *ent;
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ ent = driver->proc_entry;
+ if (!ent)
+ return;
+@@ -174,6 +180,9 @@ void proc_tty_unregister_driver(struct t
+ */
+ void __init proc_tty_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ if (!proc_mkdir("tty", NULL))
+ return;
+ proc_tty_ldisc = proc_mkdir("tty/ldisc", NULL);
+--- a/kernel/exec_domain.c
++++ b/kernel/exec_domain.c
+@@ -173,6 +173,8 @@ static const struct file_operations exec
+
+ static int __init proc_execdomains_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ proc_create("execdomains", 0, NULL, &execdomains_proc_fops);
+ return 0;
+ }
+--- a/kernel/irq/proc.c
++++ b/kernel/irq/proc.c
+@@ -311,6 +311,9 @@ void register_irq_proc(unsigned int irq,
+ {
+ char name [MAX_NAMELEN];
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip) || desc->dir)
+ return;
+
+@@ -347,6 +350,9 @@ void unregister_irq_proc(unsigned int ir
+ {
+ char name [MAX_NAMELEN];
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ if (!root_irq_dir || !desc->dir)
+ return;
+ #ifdef CONFIG_SMP
+@@ -386,6 +392,9 @@ void init_irq_proc(void)
+ unsigned int irq;
+ struct irq_desc *desc;
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ /* create /proc/irq */
+ root_irq_dir = proc_mkdir("irq", NULL);
+ if (!root_irq_dir)
+--- a/kernel/time/timer_list.c
++++ b/kernel/time/timer_list.c
+@@ -293,6 +293,8 @@ static int __init init_timer_list_procfs
+ {
+ struct proc_dir_entry *pe;
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
+ if (!pe)
+ return -ENOMEM;
+--- a/mm/vmalloc.c
++++ b/mm/vmalloc.c
+@@ -2638,6 +2638,8 @@ static const struct file_operations proc
+
+ static int __init proc_vmalloc_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
+ return 0;
+ }
+--- a/mm/vmstat.c
++++ b/mm/vmstat.c
+@@ -1224,10 +1224,12 @@ static int __init setup_vmstat(void)
+ start_cpu_timer(cpu);
+ #endif
+ #ifdef CONFIG_PROC_FS
+- proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
+- proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
++ proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
++ proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
++ proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
++ }
+ proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
+- proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
+ #endif
+ return 0;
+ }
+--- a/net/8021q/vlanproc.c
++++ b/net/8021q/vlanproc.c
+@@ -127,6 +127,9 @@ void vlan_proc_cleanup(struct net *net)
+ {
+ struct vlan_net *vn = net_generic(net, vlan_net_id);
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ if (vn->proc_vlan_conf)
+ remove_proc_entry(name_conf, vn->proc_vlan_dir);
+
+@@ -146,6 +149,9 @@ int __net_init vlan_proc_init(struct net
+ {
+ struct vlan_net *vn = net_generic(net, vlan_net_id);
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
++
+ vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net);
+ if (!vn->proc_vlan_dir)
+ goto err;
+--- a/net/core/dev.c
++++ b/net/core/dev.c
+@@ -4478,9 +4478,11 @@ static int __net_init dev_proc_net_init(
+
+ if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
+ goto out;
+- if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
++ !proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
+ goto out_dev;
+- if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
++ !proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
+ goto out_softnet;
+
+ if (wext_proc_init(net))
+@@ -4489,9 +4491,11 @@ static int __net_init dev_proc_net_init(
+ out:
+ return rc;
+ out_ptype:
+- proc_net_remove(net, "ptype");
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
++ proc_net_remove(net, "ptype");
+ out_softnet:
+- proc_net_remove(net, "softnet_stat");
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
++ proc_net_remove(net, "softnet_stat");
+ out_dev:
+ proc_net_remove(net, "dev");
+ goto out;
+@@ -4501,8 +4505,10 @@ static void __net_exit dev_proc_net_exit
+ {
+ wext_proc_exit(net);
+
+- proc_net_remove(net, "ptype");
+- proc_net_remove(net, "softnet_stat");
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
++ proc_net_remove(net, "ptype");
++ proc_net_remove(net, "softnet_stat");
++ }
+ proc_net_remove(net, "dev");
+ }
+
+--- a/net/core/sock.c
++++ b/net/core/sock.c
+@@ -2773,6 +2773,8 @@ static __net_initdata struct pernet_oper
+
+ static int __init proto_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ return register_pernet_subsys(&proto_net_ops);
+ }
+
+--- a/net/ipv4/fib_trie.c
++++ b/net/ipv4/fib_trie.c
+@@ -2607,10 +2607,12 @@ static const struct file_operations fib_
+
+ int __net_init fib_proc_init(struct net *net)
+ {
+- if (!proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops))
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
++ !proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops))
+ goto out1;
+
+- if (!proc_net_fops_create(net, "fib_triestat", S_IRUGO,
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
++ !proc_net_fops_create(net, "fib_triestat", S_IRUGO,
+ &fib_triestat_fops))
+ goto out2;
+
+@@ -2629,8 +2631,10 @@ out1:
+
+ void __net_exit fib_proc_exit(struct net *net)
+ {
+- proc_net_remove(net, "fib_trie");
+- proc_net_remove(net, "fib_triestat");
++ if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
++ proc_net_remove(net, "fib_trie");
++ proc_net_remove(net, "fib_triestat");
++ }
+ proc_net_remove(net, "route");
+ }
+
+--- a/net/ipv4/igmp.c
++++ b/net/ipv4/igmp.c
+@@ -2673,6 +2673,8 @@ static struct pernet_operations igmp_net
+
+ int __init igmp_mc_proc_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
+ return register_pernet_subsys(&igmp_net_ops);
+ }
+ #endif
+--- a/net/ipv4/ipmr.c
++++ b/net/ipv4/ipmr.c
+@@ -70,6 +70,10 @@
+ #define CONFIG_IP_PIMSM 1
+ #endif
+
++#ifdef CONFIG_PROC_STRIPPED
++#undef CONFIG_PROC_FS
++#endif
++
+ struct mr_table {
+ struct list_head list;
+ #ifdef CONFIG_NET_NS
+--- a/net/ipv4/proc.c
++++ b/net/ipv4/proc.c
+@@ -502,6 +502,9 @@ static __net_initdata struct pernet_oper
+
+ int __init ip_misc_proc_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
++
+ return register_pernet_subsys(&ip_proc_ops);
+ }
+
+--- a/net/ipv4/route.c
++++ b/net/ipv4/route.c
+@@ -427,6 +427,9 @@ static struct pernet_operations ip_rt_pr
+
+ static int __init ip_rt_proc_init(void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return 0;
++
+ return register_pernet_subsys(&ip_rt_proc_ops);
+ }
+
+--- a/ipc/msg.c
++++ b/ipc/msg.c
+@@ -135,6 +135,9 @@ void __init msg_init(void)
+ printk(KERN_INFO "msgmni has been set to %d\n",
+ init_ipc_ns.msg_ctlmni);
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ ipc_init_proc_interface("sysvipc/msg",
+ " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
+ IPC_MSG_IDS, sysvipc_msg_proc_show);
+--- a/ipc/sem.c
++++ b/ipc/sem.c
+@@ -185,6 +185,8 @@ void sem_exit_ns(struct ipc_namespace *n
+ void __init sem_init (void)
+ {
+ sem_init_ns(&init_ipc_ns);
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
+ ipc_init_proc_interface("sysvipc/sem",
+ " key semid perms nsems uid gid cuid cgid otime ctime\n",
+ IPC_SEM_IDS, sysvipc_sem_proc_show);
+--- a/ipc/shm.c
++++ b/ipc/shm.c
+@@ -115,6 +115,8 @@ pure_initcall(ipc_ns_init);
+
+ void __init shm_init (void)
+ {
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
+ ipc_init_proc_interface("sysvipc/shm",
+ #if BITS_PER_LONG <= 32
+ " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap\n",
+--- a/ipc/util.c
++++ b/ipc/util.c
+@@ -148,6 +148,9 @@ void __init ipc_init_proc_interface(cons
+ struct proc_dir_entry *pde;
+ struct ipc_proc_iface *iface;
+
++ if (IS_ENABLED(CONFIG_PROC_STRIPPED))
++ return;
++
+ iface = kmalloc(sizeof(*iface), GFP_KERNEL);
+ if (!iface)
+ return;
--- /dev/null
+--- a/fs/Kconfig
++++ b/fs/Kconfig
+@@ -62,6 +62,11 @@ config FILE_LOCKING
+ for filesystems like NFS and for the flock() system
+ call. Disabling this option saves about 11k.
+
++config DIRECT_IO
++ bool "Enable O_DIRECT support" if EXPERT
++ depends on BLOCK
++ default y
++
+ source "fs/notify/Kconfig"
+
+ source "fs/quota/Kconfig"
+--- a/fs/Makefile
++++ b/fs/Makefile
+@@ -14,7 +14,8 @@ obj-y := open.o read_write.o file_table.
+ stack.o fs_struct.o statfs.o
+
+ ifeq ($(CONFIG_BLOCK),y)
+-obj-y += buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o
++obj-y += buffer.o bio.o block_dev.o mpage.o ioprio.o
++obj-$(CONFIG_DIRECT_IO) += direct-io.o
+ else
+ obj-y += no-block.o
+ endif
+--- a/include/linux/fs.h
++++ b/include/linux/fs.h
+@@ -2444,20 +2444,36 @@ enum {
+ DIO_SKIP_HOLES = 0x02,
+ };
+
++#ifdef CONFIG_DIRECT_IO
+ void dio_end_io(struct bio *bio, int error);
+
+ ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
+ struct block_device *bdev, const struct iovec *iov, loff_t offset,
+ unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
+ dio_submit_t submit_io, int flags);
++#else
++static inline void dio_end_io(struct bio *bio, int error)
++{
++}
++static inline ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
++ struct block_device *bdev, const struct iovec *iov, loff_t offset,
++ unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
++ dio_submit_t submit_io, int flags)
++{
++ return -EOPNOTSUPP;
++}
++#endif
++
+
+ static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
+ struct inode *inode, const struct iovec *iov, loff_t offset,
+ unsigned long nr_segs, get_block_t get_block)
+ {
++#ifdef CONFIG_DIRECT_IO
+ return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+ offset, nr_segs, get_block, NULL, NULL,
+ DIO_LOCKING | DIO_SKIP_HOLES);
++#endif
+ }
+ #endif
+
+--- a/fs/fcntl.c
++++ b/fs/fcntl.c
+@@ -51,8 +51,10 @@ static int setfl(int fd, struct file * f
+ arg |= O_NONBLOCK;
+
+ if (arg & O_DIRECT) {
++#ifdef CONFIG_DIRECT_IO
+ if (!filp->f_mapping || !filp->f_mapping->a_ops ||
+ !filp->f_mapping->a_ops->direct_IO)
++#endif
+ return -EINVAL;
+ }
+
+--- a/fs/open.c
++++ b/fs/open.c
+@@ -630,9 +630,12 @@ int open_check_o_direct(struct file *f)
+ {
+ /* NB: we're sure to have correct a_ops only after f_op->open */
+ if (f->f_flags & O_DIRECT) {
++#ifdef CONFIG_DIRECT_IO
+ if (!f->f_mapping->a_ops ||
+ ((!f->f_mapping->a_ops->direct_IO) &&
+- (!f->f_mapping->a_ops->get_xip_mem))) {
++ (!f->f_mapping->a_ops->get_xip_mem)))
++#endif
++ {
+ return -EINVAL;
+ }
+ }
projects / openwrt.git / commitdiff