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kernel: add some debloat patches, strip down procfs and make O_DIRECT support optional, saves ~15K after lzma on MIPS

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SVN-Revision: 34737
This commit is contained in:
Felix Fietkau 2012-12-17 15:11:39 +00:00
parent f403e2dcca
commit 2bda7a5b41
8 changed files with 986 additions and 0 deletions
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2
target/linux/generic/config-3.6
View file

@ -607,6 +607,7 @@ CONFIG_DEVPORT=y
# CONFIG_DEVPTS_MULTIPLE_INSTANCES is not set # CONFIG_DEVPTS_MULTIPLE_INSTANCES is not set
# CONFIG_DEVTMPFS is not set # CONFIG_DEVTMPFS is not set
# CONFIG_DEVTMPFS_MOUNT is not set # CONFIG_DEVTMPFS_MOUNT is not set
# CONFIG_DIRECT_IO is not set
# CONFIG_DISCONTIGMEM_MANUAL is not set # CONFIG_DISCONTIGMEM_MANUAL is not set
# CONFIG_DISPLAY_SUPPORT is not set # CONFIG_DISPLAY_SUPPORT is not set
# CONFIG_DL2K is not set # CONFIG_DL2K is not set
@ -2279,6 +2280,7 @@ CONFIG_PRINT_STACK_DEPTH=64
CONFIG_PROC_FS=y CONFIG_PROC_FS=y
# CONFIG_PROC_KCORE is not set # CONFIG_PROC_KCORE is not set
# CONFIG_PROC_PAGE_MONITOR is not set # CONFIG_PROC_PAGE_MONITOR is not set
CONFIG_PROC_STRIPPED=y
CONFIG_PROC_SYSCTL=y CONFIG_PROC_SYSCTL=y
# CONFIG_PROFILE_ALL_BRANCHES is not set # CONFIG_PROFILE_ALL_BRANCHES is not set
# CONFIG_PROFILE_ANNOTATED_BRANCHES is not set # CONFIG_PROFILE_ANNOTATED_BRANCHES is not set

2
target/linux/generic/config-3.7
View file

@ -616,6 +616,7 @@ CONFIG_DEVPORT=y
# CONFIG_DEVTMPFS is not set # CONFIG_DEVTMPFS is not set
# CONFIG_DEVTMPFS_MOUNT is not set # CONFIG_DEVTMPFS_MOUNT is not set
# CONFIG_DGRP is not set # CONFIG_DGRP is not set
# CONFIG_DIRECT_IO is not set
# CONFIG_DISCONTIGMEM_MANUAL is not set # CONFIG_DISCONTIGMEM_MANUAL is not set
# CONFIG_DISPLAY_SUPPORT is not set # CONFIG_DISPLAY_SUPPORT is not set
# CONFIG_DL2K is not set # CONFIG_DL2K is not set
@ -2309,6 +2310,7 @@ CONFIG_PRINT_STACK_DEPTH=64
CONFIG_PROC_FS=y CONFIG_PROC_FS=y
# CONFIG_PROC_KCORE is not set # CONFIG_PROC_KCORE is not set
# CONFIG_PROC_PAGE_MONITOR is not set # CONFIG_PROC_PAGE_MONITOR is not set
CONFIG_PROC_STRIPPED=y
CONFIG_PROC_SYSCTL=y CONFIG_PROC_SYSCTL=y
# CONFIG_PROFILE_ALL_BRANCHES is not set # CONFIG_PROFILE_ALL_BRANCHES is not set
# CONFIG_PROFILE_ANNOTATED_BRANCHES is not set # CONFIG_PROFILE_ANNOTATED_BRANCHES is not set

46
target/linux/generic/patches-3.6/901-debloat_sock_diag.patch Normal file
View file

@ -0,0 +1,46 @@
--- 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.

351
target/linux/generic/patches-3.6/902-debloat_proc.patch Normal file
View file

@ -0,0 +1,351 @@
--- 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;

94
target/linux/generic/patches-3.6/903-debloat_direct_io.patch Normal file
View file

@ -0,0 +1,94 @@
--- 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;
}
}

46
target/linux/generic/patches-3.7/901-debloat_sock_diag.patch Normal file
View file

@ -0,0 +1,46 @@
--- 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.

351
target/linux/generic/patches-3.7/902-debloat_proc.patch Normal file
View file

@ -0,0 +1,351 @@
--- 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;

94
target/linux/generic/patches-3.7/903-debloat_direct_io.patch Normal file
View file

@ -0,0 +1,94 @@
--- 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;
}
}