fs/proc: sysctl: remove register ctl_table end with empty Sysctls are being moved out of kernel/sysctl.c and out to their own respective subsystems / users to help with easier maintance and avoid merge conflicts. But when we move just one entry and to its own new file the last entry for this new file must be empty, so we are essentialy bloating the kernel one extra empty entry per each newly moved sysctl. To help with this, I have added support for registering just one ctl_table, therefore not bloating the kernel when we move a single ctl_table to its own file. The optimization has been implemented in the previous patch, here use register_sysctl_single() to register single one ctl_table. In this modification, I counted the size changes of each object file during the compilation process. When there is no strip, size changes are as follows: before now save space fs/dcache.o 904936 904760 176bytes fs/exec.o 883584 883440 144bytes fs/namespace.o 1614776 1614616 160bytes fs/notify/dnotify/dnotify.o 255992 255872 120bytes init/do_mounts_initrd.o 296552 296392 160bytes kernel/acct.o 459184 459032 152bytes kernel/delayacct.o 208680 208536 144bytes kernel/kprobes.o 794968 794936 32bytes kernel/panic.o 367696 367560 136bytes When there is exec with 'strip -d', size changes are as follows: before now save space fs/dcache.o 79040 78952 88bytes fs/exec.o 57960 57864 96bytes fs/namespace.o 111904 111824 80bytes fs/notify/dnotify/dnotify.o 8816 8736 80bytes init/do_mounts_initrd.o 4872 4760 112bytes kernel/acct.o 18104 18000 104bytes kernel/delayacct.o 8768 8664 104bytes kernel/kprobes.o 63192 63104 88bytes kernel/panic.o 26760 26672 88bytes Suggested-by: Matthew Wilcox <willy@infradead.org> Suggested-by: Xiaoming Ni <nixiaoming@huawei.com> Originally-by: Meng Tang <tangmeng@uniontech.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

diff --git a/fs/dcache.c b/fs/dcache.c
index 52e6d5f..7c3b6c5 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c

@@ -190,8 +190,7 @@ static struct ctl_table fs_dcache_sysctls[] = {
 		.maxlen		= 6*sizeof(long),
 		.mode		= 0444,
 		.proc_handler	= proc_nr_dentry,
-	},
-	{ }
+	}
 };
 
 static int __init init_fs_dcache_sysctls(void)

diff --git a/fs/exec.c b/fs/exec.c
index 7c44d0c..c89175c 100644
--- a/fs/exec.c
+++ b/fs/exec.c

@@ -2162,8 +2162,7 @@ static struct ctl_table fs_exec_sysctls[] = {
 		.proc_handler	= proc_dointvec_minmax_coredump,
 		.extra1		= SYSCTL_ZERO,
 		.extra2		= SYSCTL_TWO,
-	},
-	{ }
+	}
 };
 
 static int __init init_fs_exec_sysctls(void)

diff --git a/fs/namespace.c b/fs/namespace.c
index bc0f1525..f02b4d6 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c

@@ -4712,8 +4712,7 @@ static struct ctl_table fs_namespace_sysctls[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ONE,
-	},
-	{ }
+	}
 };
 
 static int __init init_fs_namespace_sysctls(void)

diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 190aa71..9682ffb 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c

@@ -28,8 +28,7 @@ static struct ctl_table dnotify_sysctls[] = {
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
-	},
-	{}
+	}
 };
 static void __init dnotify_sysctl_init(void)
 {

diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 3473124..4d71aad 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c

@@ -28,8 +28,7 @@ static struct ctl_table kern_do_mounts_initrd_table[] = {
 		.maxlen         = sizeof(int),
 		.mode           = 0644,
 		.proc_handler   = proc_dointvec,
-	},
-	{ }
+	}
 };
 
 static __init int kernel_do_mounts_initrd_sysctls_init(void)

diff --git a/kernel/acct.c b/kernel/acct.c
index 010667c..4060f66 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c

@@ -83,8 +83,7 @@ static struct ctl_table kern_acct_table[] = {
 		.maxlen         = 3*sizeof(int),
 		.mode           = 0644,
 		.proc_handler   = proc_dointvec,
-	},
-	{ }
+	}
 };
 
 static __init int kernel_acct_sysctls_init(void)

diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index e39cb69..90eb87edb 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c

@@ -73,8 +73,7 @@ static struct ctl_table kern_delayacct_table[] = {
 		.proc_handler   = sysctl_delayacct,
 		.extra1         = SYSCTL_ZERO,
 		.extra2         = SYSCTL_ONE,
-	},
-	{ }
+	}
 };
 
 static __init int kernel_delayacct_sysctls_init(void)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 00e177d..2b1d0f8 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c

@@ -967,8 +967,7 @@ static struct ctl_table kprobe_sysctls[] = {
 		.proc_handler	= proc_kprobes_optimization_handler,
 		.extra1		= SYSCTL_ZERO,
 		.extra2		= SYSCTL_ONE,
-	},
-	{}
+	}
 };
 
 static void __init kprobe_sysctls_init(void)

diff --git a/kernel/panic.c b/kernel/panic.c
index 487f5b0..c67bd9b 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c

@@ -99,7 +99,6 @@ static struct ctl_table kern_panic_table[] = {
 		.mode           = 0644,
 		.proc_handler   = proc_douintvec,
 	},
-	{ }
 };
 
 static __init int kernel_panic_sysctls_init(void)