openwrt_lede/target/linux/generic/patches-4.4/902-debloat_proc.patch

--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2716,6 +2716,8 @@ 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
@@ -81,3 +81,8 @@ config PROC_CHILDREN
 
 	  Say Y if you are running any user-space software which takes benefit from
 	  this interface. For example, rkt is such a piece of software.
+
+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
@@ -106,6 +106,9 @@ 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
@@ -144,7 +144,10 @@ 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;
@@ -161,6 +164,9 @@ 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;
@@ -175,6 +181,9 @@ 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_mkdir("tty/ldisc", NULL);	/* Preserved: it's userspace visible */
--- a/kernel/exec_domain.c
+++ b/kernel/exec_domain.c
@@ -41,6 +41,8 @@ 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
@@ -327,6 +327,9 @@ void register_irq_proc(unsigned int irq,
 	static DEFINE_MUTEX(register_lock);
 	char name [MAX_NAMELEN];
 
+	if (IS_ENABLED(CONFIG_PROC_STRIPPED) && !IS_ENABLED(CONFIG_SMP))
+		return;
+
 	if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip))
 		return;
 
@@ -376,6 +379,9 @@ void unregister_irq_proc(unsigned int ir
 {
 	char name [MAX_NAMELEN];
 
+	if (IS_ENABLED(CONFIG_PROC_STRIPPED) && !IS_ENABLED(CONFIG_SMP))
+		return;
+
 	if (!root_irq_dir || !desc->dir)
 		return;
 #ifdef CONFIG_SMP
@@ -411,6 +417,9 @@ void init_irq_proc(void)
 	unsigned int irq;
 	struct irq_desc *desc;
 
+	if (IS_ENABLED(CONFIG_PROC_STRIPPED) && !IS_ENABLED(CONFIG_SMP))
+		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
@@ -400,6 +400,8 @@ 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", 0400, NULL, &timer_list_fops);
 	if (!pe)
 		return -ENOMEM;
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2698,6 +2698,8 @@ 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
@@ -1588,10 +1588,12 @@ static int __init setup_vmstat(void)
 	cpu_notifier_register_done();
 #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/sock.c
+++ b/net/core/sock.c
@@ -3048,6 +3048,8 @@ 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
@@ -2651,10 +2651,12 @@ static const struct file_operations fib_
 
 int __net_init fib_proc_init(struct net *net)
 {
-	if (!proc_create("fib_trie", S_IRUGO, net->proc_net, &fib_trie_fops))
+	if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
+		!proc_create("fib_trie", S_IRUGO, net->proc_net, &fib_trie_fops))
 		goto out1;
 
-	if (!proc_create("fib_triestat", S_IRUGO, net->proc_net,
+	if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
+		!proc_create("fib_triestat", S_IRUGO, net->proc_net,
 			 &fib_triestat_fops))
 		goto out2;
 
@@ -2664,17 +2666,21 @@ int __net_init fib_proc_init(struct net
 	return 0;
 
 out3:
-	remove_proc_entry("fib_triestat", net->proc_net);
+	if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
+		remove_proc_entry("fib_triestat", net->proc_net);
 out2:
-	remove_proc_entry("fib_trie", net->proc_net);
+	if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
+		remove_proc_entry("fib_trie", net->proc_net);
 out1:
 	return -ENOMEM;
 }
 
 void __net_exit fib_proc_exit(struct net *net)
 {
-	remove_proc_entry("fib_trie", net->proc_net);
-	remove_proc_entry("fib_triestat", net->proc_net);
+	if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
+		remove_proc_entry("fib_trie", net->proc_net);
+		remove_proc_entry("fib_triestat", net->proc_net);
+	}
 	remove_proc_entry("route", net->proc_net);
 }
 
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -541,6 +541,9 @@ 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
@@ -423,6 +423,9 @@ 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
@@ -1071,6 +1071,9 @@ void __init msg_init(void)
 {
 	msg_init_ns(&init_ipc_ns);
 
+	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
@@ -198,6 +198,8 @@ 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
@@ -118,6 +118,8 @@ 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
@@ -121,6 +121,9 @@ 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;
--- a/net/core/net-procfs.c
+++ b/net/core/net-procfs.c
@@ -318,10 +318,12 @@ static int __net_init dev_proc_net_init(
 
 	if (!proc_create("dev", S_IRUGO, net->proc_net, &dev_seq_fops))
 		goto out;
-	if (!proc_create("softnet_stat", S_IRUGO, net->proc_net,
+	if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
+		!proc_create("softnet_stat", S_IRUGO, net->proc_net,
 			 &softnet_seq_fops))
 		goto out_dev;
-	if (!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
+	if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
+		!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
 		goto out_softnet;
 
 	if (wext_proc_init(net))
@@ -330,9 +332,11 @@ static int __net_init dev_proc_net_init(
 out:
 	return rc;
 out_ptype:
-	remove_proc_entry("ptype", net->proc_net);
+	if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
+		remove_proc_entry("ptype", net->proc_net);
 out_softnet:
-	remove_proc_entry("softnet_stat", net->proc_net);
+	if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
+		remove_proc_entry("softnet_stat", net->proc_net);
 out_dev:
 	remove_proc_entry("dev", net->proc_net);
 	goto out;
@@ -342,8 +346,10 @@ static void __net_exit dev_proc_net_exit
 {
 	wext_proc_exit(net);
 
-	remove_proc_entry("ptype", net->proc_net);
-	remove_proc_entry("softnet_stat", net->proc_net);
+	if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
+		remove_proc_entry("ptype", net->proc_net);
+		remove_proc_entry("softnet_stat", net->proc_net);
+	}
 	remove_proc_entry("dev", net->proc_net);
 }
 
--- a/include/net/snmp.h
+++ b/include/net/snmp.h
@@ -123,6 +123,30 @@ struct linux_xfrm_mib {
 #define DECLARE_SNMP_STAT(type, name)	\
 	extern __typeof__(type) __percpu *name
 
+#ifdef CONFIG_PROC_STRIPPED
+#define SNMP_INC_STATS_BH(mib, field)	\
+	do { (void) mib->mibs[0]; } while(0)
+#define SNMP_INC_STATS_USER(mib, field)	\
+	do { (void) mib->mibs[0]; } while(0)
+#define SNMP_INC_STATS_ATOMIC_LONG(mib, field)	\
+	do { (void) mib->mibs[0]; } while(0)
+#define SNMP_INC_STATS(mib, field)	\
+	do { (void) mib->mibs[0]; } while(0)
+#define SNMP_DEC_STATS(mib, field)	\
+	do { (void) mib->mibs[0]; } while(0)
+#define SNMP_ADD_STATS_BH(mib, field, addend)	\
+	do { (void) mib->mibs[0]; } while(0)
+#define SNMP_ADD_STATS_USER(mib, field, addend)	\
+	do { (void) mib->mibs[0]; } while(0)
+#define SNMP_ADD_STATS(mib, field, addend)	\
+	do { (void) mib->mibs[0]; } while(0)
+#define SNMP_UPD_PO_STATS(mib, basefield, addend)	\
+	do { (void) mib->mibs[0]; } while(0)
+#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend)	\
+	do { (void) mib->mibs[0]; } while(0)
+
+#else
+
 #define SNMP_INC_STATS_BH(mib, field)	\
 			__this_cpu_inc(mib->mibs[field])
 
@@ -159,8 +183,9 @@ struct linux_xfrm_mib {
 		__this_cpu_add(ptr[basefield##OCTETS], addend);	\
 	} while (0)
 
+#endif
 
-#if BITS_PER_LONG==32
+#if (BITS_PER_LONG==32) && !defined(CONFIG_PROC_STRIPPED)
 
 #define SNMP_ADD_STATS64_BH(mib, field, addend) 			\
 	do {								\