[PATCH 08/11] sysctl: Add size to register_sysctl_init

[PATCH 08/11] sysctl: Add size to register_sysctl_init

[Joel Granados]

In order to remove the end element from the ctl_table struct arrays, we
explicitly define the size when registering the targes. We add a size
argument to the register_sysctl_init call and pass an ARRAY_SIZE for all
the callers.

Signed-off-by: Joel Granados <j.granados@samsung.com>
---
 arch/x86/kernel/cpu/intel.c      |  2 +-
 drivers/char/random.c            |  3 ++-
 drivers/tty/tty_io.c             |  2 +-
 drivers/xen/balloon.c            |  3 ++-
 fs/aio.c                         |  2 +-
 fs/coredump.c                    |  3 ++-
 fs/dcache.c                      |  3 ++-
 fs/exec.c                        |  3 ++-
 fs/file_table.c                  |  3 ++-
 fs/inode.c                       |  2 +-
 fs/locks.c                       |  2 +-
 fs/namei.c                       |  2 +-
 fs/namespace.c                   |  3 ++-
 fs/notify/dnotify/dnotify.c      |  3 ++-
 fs/pipe.c                        |  3 ++-
 fs/proc/proc_sysctl.c            | 11 ++---------
 fs/quota/dquot.c                 |  3 ++-
 fs/sysctls.c                     |  3 ++-
 fs/userfaultfd.c                 |  3 ++-
 include/linux/sysctl.h           |  8 +++++---
 init/do_mounts_initrd.c          |  3 ++-
 kernel/acct.c                    |  3 ++-
 kernel/bpf/syscall.c             |  3 ++-
 kernel/delayacct.c               |  3 ++-
 kernel/exit.c                    |  3 ++-
 kernel/hung_task.c               |  3 ++-
 kernel/kexec_core.c              |  3 ++-
 kernel/kprobes.c                 |  3 ++-
 kernel/latencytop.c              |  3 ++-
 kernel/locking/lockdep.c         |  3 ++-
 kernel/panic.c                   |  3 ++-
 kernel/pid_namespace.c           |  3 ++-
 kernel/printk/sysctl.c           |  3 ++-
 kernel/reboot.c                  |  3 ++-
 kernel/sched/autogroup.c         |  3 ++-
 kernel/sched/core.c              |  3 ++-
 kernel/sched/deadline.c          |  3 ++-
 kernel/sched/fair.c              |  3 ++-
 kernel/sched/rt.c                |  3 ++-
 kernel/sched/topology.c          |  3 ++-
 kernel/seccomp.c                 |  3 ++-
 kernel/signal.c                  |  3 ++-
 kernel/stackleak.c               |  3 ++-
 kernel/sysctl.c                  |  4 ++--
 kernel/trace/ftrace.c            |  3 ++-
 kernel/trace/trace_events_user.c |  3 ++-
 kernel/umh.c                     |  3 ++-
 kernel/watchdog.c                |  3 ++-
 mm/compaction.c                  |  2 +-
 mm/hugetlb.c                     |  2 +-
 mm/hugetlb_vmemmap.c             |  3 ++-
 mm/memory-failure.c              |  3 ++-
 mm/oom_kill.c                    |  3 ++-
 mm/page-writeback.c              |  3 ++-
 security/keys/sysctl.c           |  2 +-
 55 files changed, 104 insertions(+), 66 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 1c4639588ff9..c77a3961443d 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -1195,7 +1195,7 @@ static struct ctl_table sld_sysctls[] = {
 
 static int __init sld_mitigate_sysctl_init(void)
 {
-	register_sysctl_init("kernel", sld_sysctls);
+	register_sysctl_init("kernel", sld_sysctls, ARRAY_SIZE(sld_sysctls));
 	return 0;
 }
 
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 253f2ddb8913..8db2ea9e3d66 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1692,7 +1692,8 @@ static struct ctl_table random_table[] = {
  */
 static int __init random_sysctls_init(void)
 {
-	register_sysctl_init("kernel/random", random_table);
+	register_sysctl_init("kernel/random", random_table,
+			     ARRAY_SIZE(random_table));
 	return 0;
 }
 device_initcall(random_sysctls_init);
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c84be40fb8df..63fb3c543b94 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3618,7 +3618,7 @@ static struct ctl_table tty_table[] = {
  */
 int __init tty_init(void)
 {
-	register_sysctl_init("dev/tty", tty_table);
+	register_sysctl_init("dev/tty", tty_table, ARRAY_SIZE(tty_table));
 	cdev_init(&tty_cdev, &tty_fops);
 	if (cdev_add(&tty_cdev, MKDEV(TTYAUX_MAJOR, 0), 1) ||
 	    register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") < 0)
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 586a1673459e..e4544262a429 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -729,7 +729,8 @@ static int __init balloon_init(void)
 #ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
 	set_online_page_callback(&xen_online_page);
 	register_memory_notifier(&xen_memory_nb);
-	register_sysctl_init("xen/balloon", balloon_table);
+	register_sysctl_init("xen/balloon", balloon_table,
+			     ARRAY_SIZE(balloon_table));
 #endif
 
 	balloon_add_regions();
diff --git a/fs/aio.c b/fs/aio.c
index b0b17bd098bb..b09abe7a14d3 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -244,7 +244,7 @@ static struct ctl_table aio_sysctls[] = {
 
 static void __init aio_sysctl_init(void)
 {
-	register_sysctl_init("fs", aio_sysctls);
+	register_sysctl_init("fs", aio_sysctls, ARRAY_SIZE(aio_sysctls));
 }
 #else
 #define aio_sysctl_init() do { } while (0)
diff --git a/fs/coredump.c b/fs/coredump.c
index ece7badf701b..7e55428dce13 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -984,7 +984,8 @@ static struct ctl_table coredump_sysctls[] = {
 
 static int __init init_fs_coredump_sysctls(void)
 {
-	register_sysctl_init("kernel", coredump_sysctls);
+	register_sysctl_init("kernel", coredump_sysctls,
+			     ARRAY_SIZE(coredump_sysctls));
 	return 0;
 }
 fs_initcall(init_fs_coredump_sysctls);
diff --git a/fs/dcache.c b/fs/dcache.c
index 52e6d5fdab6b..f02bfd383e66 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -196,7 +196,8 @@ static struct ctl_table fs_dcache_sysctls[] = {
 
 static int __init init_fs_dcache_sysctls(void)
 {
-	register_sysctl_init("fs", fs_dcache_sysctls);
+	register_sysctl_init("fs", fs_dcache_sysctls,
+			     ARRAY_SIZE(fs_dcache_sysctls));
 	return 0;
 }
 fs_initcall(init_fs_dcache_sysctls);
diff --git a/fs/exec.c b/fs/exec.c
index a466e797c8e2..5572d148738b 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -2170,7 +2170,8 @@ static struct ctl_table fs_exec_sysctls[] = {
 
 static int __init init_fs_exec_sysctls(void)
 {
-	register_sysctl_init("fs", fs_exec_sysctls);
+	register_sysctl_init("fs", fs_exec_sysctls,
+			     ARRAY_SIZE(fs_exec_sysctls));
 	return 0;
 }
 
diff --git a/fs/file_table.c b/fs/file_table.c
index 372653b92617..23a645521960 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -120,7 +120,8 @@ static struct ctl_table fs_stat_sysctls[] = {
 
 static int __init init_fs_stat_sysctls(void)
 {
-	register_sysctl_init("fs", fs_stat_sysctls);
+	register_sysctl_init("fs", fs_stat_sysctls,
+			     ARRAY_SIZE(fs_stat_sysctls));
 	if (IS_ENABLED(CONFIG_BINFMT_MISC)) {
 		struct ctl_table_header *hdr;
 		hdr = register_sysctl_mount_point("fs/binfmt_misc");
diff --git a/fs/inode.c b/fs/inode.c
index 577799b7855f..0a0ad1a2a5d2 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -135,7 +135,7 @@ static struct ctl_table inodes_sysctls[] = {
 
 static int __init init_fs_inode_sysctls(void)
 {
-	register_sysctl_init("fs", inodes_sysctls);
+	register_sysctl_init("fs", inodes_sysctls, ARRAY_SIZE(inodes_sysctls));
 	return 0;
 }
 early_initcall(init_fs_inode_sysctls);
diff --git a/fs/locks.c b/fs/locks.c
index df8b26a42524..ce5733480aa6 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -116,7 +116,7 @@ static struct ctl_table locks_sysctls[] = {
 
 static int __init init_fs_locks_sysctls(void)
 {
-	register_sysctl_init("fs", locks_sysctls);
+	register_sysctl_init("fs", locks_sysctls, ARRAY_SIZE(locks_sysctls));
 	return 0;
 }
 early_initcall(init_fs_locks_sysctls);
diff --git a/fs/namei.c b/fs/namei.c
index e4fe0879ae55..9b567af081af 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1073,7 +1073,7 @@ static struct ctl_table namei_sysctls[] = {
 
 static int __init init_fs_namei_sysctls(void)
 {
-	register_sysctl_init("fs", namei_sysctls);
+	register_sysctl_init("fs", namei_sysctls, ARRAY_SIZE(namei_sysctls));
 	return 0;
 }
 fs_initcall(init_fs_namei_sysctls);
diff --git a/fs/namespace.c b/fs/namespace.c
index 54847db5b819..e7f251e40485 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -4715,7 +4715,8 @@ static struct ctl_table fs_namespace_sysctls[] = {
 
 static int __init init_fs_namespace_sysctls(void)
 {
-	register_sysctl_init("fs", fs_namespace_sysctls);
+	register_sysctl_init("fs", fs_namespace_sysctls,
+			     ARRAY_SIZE(fs_namespace_sysctls));
 	return 0;
 }
 fs_initcall(init_fs_namespace_sysctls);
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 190aa717fa32..2c6fe98d6fe1 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -33,7 +33,8 @@ static struct ctl_table dnotify_sysctls[] = {
 };
 static void __init dnotify_sysctl_init(void)
 {
-	register_sysctl_init("fs", dnotify_sysctls);
+	register_sysctl_init("fs", dnotify_sysctls,
+			     ARRAY_SIZE(dnotify_sysctls));
 }
 #else
 #define dnotify_sysctl_init() do { } while (0)
diff --git a/fs/pipe.c b/fs/pipe.c
index 2d88f73f585a..8a808fc25552 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1508,7 +1508,8 @@ static int __init init_pipe_fs(void)
 		}
 	}
 #ifdef CONFIG_SYSCTL
-	register_sysctl_init("fs", fs_pipe_sysctls);
+	register_sysctl_init("fs", fs_pipe_sysctls,
+			     ARRAY_SIZE(fs_pipe_sysctls));
 #endif
 	return err;
 }
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 66c9d7a07d2e..9670c5b7b5b2 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -1443,16 +1443,9 @@ EXPORT_SYMBOL(register_sysctl);
  * Context: if your base directory does not exist it will be created for you.
  */
 void __init __register_sysctl_init(const char *path, struct ctl_table *table,
-				 const char *table_name)
+				 const char *table_name, size_t table_size)
 {
-	int count = 0;
-	struct ctl_table *entry;
-	struct ctl_table_header t_hdr, *hdr;
-
-	t_hdr.ctl_table = table;
-	list_for_each_table_entry(entry, (&t_hdr))
-		count++;
-	hdr = register_sysctl(path, table, count);
+	struct ctl_table_header *hdr = register_sysctl(path, table, table_size);
 
 	if (unlikely(!hdr)) {
 		pr_err("failed when register_sysctl %s to %s\n", table_name, path);
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index ffd40dc3e4e9..7c07654e4253 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2953,7 +2953,8 @@ static int __init dquot_init(void)
 
 	printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
 
-	register_sysctl_init("fs/quota", fs_dqstats_table);
+	register_sysctl_init("fs/quota", fs_dqstats_table,
+			     ARRAY_SIZE(fs_dqstats_table));
 
 	dquot_cachep = kmem_cache_create("dquot",
 			sizeof(struct dquot), sizeof(unsigned long) * 4,
diff --git a/fs/sysctls.c b/fs/sysctls.c
index 76a0aee8c229..944254dd92c0 100644
--- a/fs/sysctls.c
+++ b/fs/sysctls.c
@@ -31,7 +31,8 @@ static struct ctl_table fs_shared_sysctls[] = {
 
 static int __init init_fs_sysctls(void)
 {
-	register_sysctl_init("fs", fs_shared_sysctls);
+	register_sysctl_init("fs", fs_shared_sysctls,
+			     ARRAY_SIZE(fs_shared_sysctls));
 	return 0;
 }
 
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 0fd96d6e39ce..4c3858769226 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -2219,7 +2219,8 @@ static int __init userfaultfd_init(void)
 						SLAB_HWCACHE_ALIGN|SLAB_PANIC,
 						init_once_userfaultfd_ctx);
 #ifdef CONFIG_SYSCTL
-	register_sysctl_init("vm", vm_userfaultfd_table);
+	register_sysctl_init("vm", vm_userfaultfd_table,
+			     ARRAY_SIZE(vm_userfaultfd_table));
 #endif
 	return 0;
 }
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 71d7935e50f0..3074a506592d 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -233,8 +233,9 @@ void unregister_sysctl_table(struct ctl_table_header * table);
 
 extern int sysctl_init_bases(void);
 extern void __register_sysctl_init(const char *path, struct ctl_table *table,
-				 const char *table_name);
-#define register_sysctl_init(path, table) __register_sysctl_init(path, table, #table)
+				 const char *table_name, size_t table_size);
+#define register_sysctl_init(path, table, size)	\
+	__register_sysctl_init(path, table, #table, size)
 extern struct ctl_table_header *register_sysctl_mount_point(const char *path);
 
 void do_sysctl_args(void);
@@ -254,7 +255,8 @@ extern int no_unaligned_warning;
 
 #else /* CONFIG_SYSCTL */
 
-static inline void register_sysctl_init(const char *path, struct ctl_table *table)
+static inline void register_sysctl_init(const char *path, struct ctl_table *table,
+					size_t table_size)
 {
 }
 
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 34731241377d..2b10abb8c80e 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -34,7 +34,8 @@ static struct ctl_table kern_do_mounts_initrd_table[] = {
 
 static __init int kernel_do_mounts_initrd_sysctls_init(void)
 {
-	register_sysctl_init("kernel", kern_do_mounts_initrd_table);
+	register_sysctl_init("kernel", kern_do_mounts_initrd_table,
+			     ARRAY_SIZE(kern_do_mounts_initrd_table));
 	return 0;
 }
 late_initcall(kernel_do_mounts_initrd_sysctls_init);
diff --git a/kernel/acct.c b/kernel/acct.c
index 010667ce6080..67125b7c5ca2 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -89,7 +89,8 @@ static struct ctl_table kern_acct_table[] = {
 
 static __init int kernel_acct_sysctls_init(void)
 {
-	register_sysctl_init("kernel", kern_acct_table);
+	register_sysctl_init("kernel", kern_acct_table,
+			     ARRAY_SIZE(kern_acct_table));
 	return 0;
 }
 late_initcall(kernel_acct_sysctls_init);
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 14f39c1e573e..a81b5122b16b 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -5406,7 +5406,8 @@ static struct ctl_table bpf_syscall_table[] = {
 
 static int __init bpf_syscall_sysctl_init(void)
 {
-	register_sysctl_init("kernel", bpf_syscall_table);
+	register_sysctl_init("kernel", bpf_syscall_table,
+			     ARRAY_SIZE(bpf_syscall_table));
 	return 0;
 }
 late_initcall(bpf_syscall_sysctl_init);
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 6f0c358e73d8..4ef14cb5b5a0 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -79,7 +79,8 @@ static struct ctl_table kern_delayacct_table[] = {
 
 static __init int kernel_delayacct_sysctls_init(void)
 {
-	register_sysctl_init("kernel", kern_delayacct_table);
+	register_sysctl_init("kernel", kern_delayacct_table,
+			     ARRAY_SIZE(kern_delayacct_table));
 	return 0;
 }
 late_initcall(kernel_delayacct_sysctls_init);
diff --git a/kernel/exit.c b/kernel/exit.c
index 34b90e2e7cf7..633c7a52ef80 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -95,7 +95,8 @@ static struct ctl_table kern_exit_table[] = {
 
 static __init int kernel_exit_sysctls_init(void)
 {
-	register_sysctl_init("kernel", kern_exit_table);
+	register_sysctl_init("kernel", kern_exit_table,
+			     ARRAY_SIZE(kern_exit_table));
 	return 0;
 }
 late_initcall(kernel_exit_sysctls_init);
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 9a24574988d2..816f133266c4 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -318,7 +318,8 @@ static struct ctl_table hung_task_sysctls[] = {
 
 static void __init hung_task_sysctl_init(void)
 {
-	register_sysctl_init("kernel", hung_task_sysctls);
+	register_sysctl_init("kernel", hung_task_sysctls,
+			     ARRAY_SIZE(hung_task_sysctls));
 }
 #else
 #define hung_task_sysctl_init() do { } while (0)
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 3d578c6fefee..63b04e710890 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -1007,7 +1007,8 @@ static struct ctl_table kexec_core_sysctls[] = {
 
 static int __init kexec_core_sysctl_init(void)
 {
-	register_sysctl_init("kernel", kexec_core_sysctls);
+	register_sysctl_init("kernel", kexec_core_sysctls,
+			     ARRAY_SIZE(kexec_core_sysctls));
 	return 0;
 }
 late_initcall(kexec_core_sysctl_init);
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 00e177de91cc..06a3ac7993f0 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -973,7 +973,8 @@ static struct ctl_table kprobe_sysctls[] = {
 
 static void __init kprobe_sysctls_init(void)
 {
-	register_sysctl_init("debug", kprobe_sysctls);
+	register_sysctl_init("debug", kprobe_sysctls,
+			     ARRAY_SIZE(kprobe_sysctls));
 }
 #endif /* CONFIG_SYSCTL */
 
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index 781249098cb6..55050ae0e197 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -293,7 +293,8 @@ static int __init init_lstats_procfs(void)
 {
 	proc_create("latency_stats", 0644, NULL, &lstats_proc_ops);
 #ifdef CONFIG_SYSCTL
-	register_sysctl_init("kernel", latencytop_sysctl);
+	register_sysctl_init("kernel", latencytop_sysctl,
+			     ARRAY_SIZE(latencytop_sysctl));
 #endif
 	return 0;
 }
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index dcd1d5bfc1e0..1e29cec7e00c 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -102,7 +102,8 @@ static struct ctl_table kern_lockdep_table[] = {
 
 static __init int kernel_lockdep_sysctls_init(void)
 {
-	register_sysctl_init("kernel", kern_lockdep_table);
+	register_sysctl_init("kernel", kern_lockdep_table,
+			     ARRAY_SIZE(kern_lockdep_table));
 	return 0;
 }
 late_initcall(kernel_lockdep_sysctls_init);
diff --git a/kernel/panic.c b/kernel/panic.c
index 886d2ebd0a0d..0008273d23fd 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -104,7 +104,8 @@ static struct ctl_table kern_panic_table[] = {
 
 static __init int kernel_panic_sysctls_init(void)
 {
-	register_sysctl_init("kernel", kern_panic_table);
+	register_sysctl_init("kernel", kern_panic_table,
+			     ARRAY_SIZE(kern_panic_table));
 	return 0;
 }
 late_initcall(kernel_panic_sysctls_init);
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index b43eee07b00c..7fd5e8adc2e8 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -472,7 +472,8 @@ static __init int pid_namespaces_init(void)
 	pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC | SLAB_ACCOUNT);
 
 #ifdef CONFIG_CHECKPOINT_RESTORE
-	register_sysctl_init("kernel", pid_ns_ctl_table);
+	register_sysctl_init("kernel", pid_ns_ctl_table,
+			     ARRAY_SIZE(pid_ns_ctl_table));
 #endif
 
 	register_pid_ns_sysctl_table_vm();
diff --git a/kernel/printk/sysctl.c b/kernel/printk/sysctl.c
index c228343eeb97..28f37b86414e 100644
--- a/kernel/printk/sysctl.c
+++ b/kernel/printk/sysctl.c
@@ -81,5 +81,6 @@ static struct ctl_table printk_sysctls[] = {
 
 void __init printk_sysctl_init(void)
 {
-	register_sysctl_init("kernel", printk_sysctls);
+	register_sysctl_init("kernel", printk_sysctls,
+			     ARRAY_SIZE(printk_sysctls));
 }
diff --git a/kernel/reboot.c b/kernel/reboot.c
index 3bba88c7ffc6..cf81d8bfb523 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -1277,7 +1277,8 @@ static struct ctl_table kern_reboot_table[] = {
 
 static void __init kernel_reboot_sysctls_init(void)
 {
-	register_sysctl_init("kernel", kern_reboot_table);
+	register_sysctl_init("kernel", kern_reboot_table,
+			     ARRAY_SIZE(kern_reboot_table));
 }
 #else
 #define kernel_reboot_sysctls_init() do { } while (0)
diff --git a/kernel/sched/autogroup.c b/kernel/sched/autogroup.c
index 991fc9002535..2b9ce82279a5 100644
--- a/kernel/sched/autogroup.c
+++ b/kernel/sched/autogroup.c
@@ -24,7 +24,8 @@ static struct ctl_table sched_autogroup_sysctls[] = {
 
 static void __init sched_autogroup_sysctl_init(void)
 {
-	register_sysctl_init("kernel", sched_autogroup_sysctls);
+	register_sysctl_init("kernel", sched_autogroup_sysctls,
+			     ARRAY_SIZE(sched_autogroup_sysctls));
 }
 #else
 #define sched_autogroup_sysctl_init() do { } while (0)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a68d1276bab0..b8c7e01dd78a 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4677,7 +4677,8 @@ static struct ctl_table sched_core_sysctls[] = {
 };
 static int __init sched_core_sysctl_init(void)
 {
-	register_sysctl_init("kernel", sched_core_sysctls);
+	register_sysctl_init("kernel", sched_core_sysctls,
+			     ARRAY_SIZE(sched_core_sysctls));
 	return 0;
 }
 late_initcall(sched_core_sysctl_init);
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 5a9a4b81c972..2aacf5ea2ff3 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -46,7 +46,8 @@ static struct ctl_table sched_dl_sysctls[] = {
 
 static int __init sched_dl_sysctl_init(void)
 {
-	register_sysctl_init("kernel", sched_dl_sysctls);
+	register_sysctl_init("kernel", sched_dl_sysctls,
+			     ARRAY_SIZE(sched_dl_sysctls));
 	return 0;
 }
 late_initcall(sched_dl_sysctl_init);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 373ff5f55884..db09e56c2dd3 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -217,7 +217,8 @@ static struct ctl_table sched_fair_sysctls[] = {
 
 static int __init sched_fair_sysctl_init(void)
 {
-	register_sysctl_init("kernel", sched_fair_sysctls);
+	register_sysctl_init("kernel", sched_fair_sysctls,
+			     ARRAY_SIZE(sched_fair_sysctls));
 	return 0;
 }
 late_initcall(sched_fair_sysctl_init);
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 00e0e5074115..aab9b900ed6f 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -57,7 +57,8 @@ static struct ctl_table sched_rt_sysctls[] = {
 
 static int __init sched_rt_sysctl_init(void)
 {
-	register_sysctl_init("kernel", sched_rt_sysctls);
+	register_sysctl_init("kernel", sched_rt_sysctls,
+			     ARRAY_SIZE(sched_rt_sysctls));
 	return 0;
 }
 late_initcall(sched_rt_sysctl_init);
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 6682535e37c8..46d7c3f3e830 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -255,7 +255,8 @@ static struct ctl_table sched_energy_aware_sysctls[] = {
 
 static int __init sched_energy_aware_sysctl_init(void)
 {
-	register_sysctl_init("kernel", sched_energy_aware_sysctls);
+	register_sysctl_init("kernel", sched_energy_aware_sysctls,
+			     ARRAY_SIZE(sched_energy_aware_sysctls));
 	return 0;
 }
 
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index d3e584065c7f..9683a9a4709d 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -2386,7 +2386,8 @@ static struct ctl_table seccomp_sysctl_table[] = {
 
 static int __init seccomp_sysctl_init(void)
 {
-	register_sysctl_init("kernel/seccomp", seccomp_sysctl_table);
+	register_sysctl_init("kernel/seccomp", seccomp_sysctl_table,
+			     ARRAY_SIZE(seccomp_sysctl_table));
 	return 0;
 }
 
diff --git a/kernel/signal.c b/kernel/signal.c
index 5ba4150c01a7..19791930f12a 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -4788,7 +4788,8 @@ static struct ctl_table signal_debug_table[] = {
 
 static int __init init_signal_sysctls(void)
 {
-	register_sysctl_init("debug", signal_debug_table);
+	register_sysctl_init("debug", signal_debug_table,
+			     ARRAY_SIZE(signal_debug_table));
 	return 0;
 }
 early_initcall(init_signal_sysctls);
diff --git a/kernel/stackleak.c b/kernel/stackleak.c
index 34c9d81eea94..123844341148 100644
--- a/kernel/stackleak.c
+++ b/kernel/stackleak.c
@@ -59,7 +59,8 @@ static struct ctl_table stackleak_sysctls[] = {
 
 static int __init stackleak_sysctls_init(void)
 {
-	register_sysctl_init("kernel", stackleak_sysctls);
+	register_sysctl_init("kernel", stackleak_sysctls,
+			     ARRAY_SIZE(stackleak_sysctls));
 	return 0;
 }
 late_initcall(stackleak_sysctls_init);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 48046932d573..2b9b0c8569ba 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2321,8 +2321,8 @@ static struct ctl_table vm_table[] = {
 
 int __init sysctl_init_bases(void)
 {
-	register_sysctl_init("kernel", kern_table);
-	register_sysctl_init("vm", vm_table);
+	register_sysctl_init("kernel", kern_table, ARRAY_SIZE(kern_table));
+	register_sysctl_init("vm", vm_table, ARRAY_SIZE(vm_table));
 
 	return 0;
 }
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 764668467155..84ef42111f78 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -8219,7 +8219,8 @@ static struct ctl_table ftrace_sysctls[] = {
 
 static int __init ftrace_sysctl_init(void)
 {
-	register_sysctl_init("kernel", ftrace_sysctls);
+	register_sysctl_init("kernel", ftrace_sysctls,
+			     ARRAY_SIZE(ftrace_sysctls));
 	return 0;
 }
 late_initcall(ftrace_sysctl_init);
diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
index b1ecd7677642..ac019cb21b18 100644
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -2563,7 +2563,8 @@ static int __init trace_events_user_init(void)
 	if (dyn_event_register(&user_event_dops))
 		pr_warn("user_events could not register with dyn_events\n");
 
-	register_sysctl_init("kernel", user_event_sysctls);
+	register_sysctl_init("kernel", user_event_sysctls,
+			     ARRAY_SIZE(user_event_sysctls));
 
 	return 0;
 }
diff --git a/kernel/umh.c b/kernel/umh.c
index 41088c5c39fd..187a30ff8541 100644
--- a/kernel/umh.c
+++ b/kernel/umh.c
@@ -565,7 +565,8 @@ static struct ctl_table usermodehelper_table[] = {
 
 static int __init init_umh_sysctls(void)
 {
-	register_sysctl_init("kernel/usermodehelper", usermodehelper_table);
+	register_sysctl_init("kernel/usermodehelper", usermodehelper_table,
+			     ARRAY_SIZE(usermodehelper_table));
 	return 0;
 }
 early_initcall(init_umh_sysctls);
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 8e61f21e7e33..dd5a343fadde 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -847,7 +847,8 @@ static struct ctl_table watchdog_sysctls[] = {
 
 static void __init watchdog_sysctl_init(void)
 {
-	register_sysctl_init("kernel", watchdog_sysctls);
+	register_sysctl_init("kernel", watchdog_sysctls,
+			     ARRAY_SIZE(watchdog_sysctls));
 }
 #else
 #define watchdog_sysctl_init() do { } while (0)
diff --git a/mm/compaction.c b/mm/compaction.c
index c8bcdea15f5f..ca09cdd72bf3 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -3145,7 +3145,7 @@ static int __init kcompactd_init(void)
 
 	for_each_node_state(nid, N_MEMORY)
 		kcompactd_run(nid);
-	register_sysctl_init("vm", vm_compaction);
+	register_sysctl_init("vm", vm_compaction, ARRAY_SIZE(vm_compaction));
 	return 0;
 }
 subsys_initcall(kcompactd_init)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f154019e6b84..7838b0c0b82b 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4681,7 +4681,7 @@ static struct ctl_table hugetlb_table[] = {
 
 static void hugetlb_sysctl_init(void)
 {
-	register_sysctl_init("vm", hugetlb_table);
+	register_sysctl_init("vm", hugetlb_table, ARRAY_SIZE(hugetlb_table));
 }
 #endif /* CONFIG_SYSCTL */
 
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index 27f001e0f0a2..65885a06269b 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -597,7 +597,8 @@ static int __init hugetlb_vmemmap_init(void)
 
 	for_each_hstate(h) {
 		if (hugetlb_vmemmap_optimizable(h)) {
-			register_sysctl_init("vm", hugetlb_vmemmap_sysctls);
+			register_sysctl_init("vm", hugetlb_vmemmap_sysctls,
+					     ARRAY_SIZE(hugetlb_vmemmap_sysctls));
 			break;
 		}
 	}
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 5b663eca1f29..46aef76d8e91 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -148,7 +148,8 @@ static struct ctl_table memory_failure_table[] = {
 
 static int __init memory_failure_sysctl_init(void)
 {
-	register_sysctl_init("vm", memory_failure_table);
+	register_sysctl_init("vm", memory_failure_table,
+			     ARRAY_SIZE(memory_failure_table));
 	return 0;
 }
 late_initcall(memory_failure_sysctl_init);
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 044e1eed720e..500cf2ef9faa 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -734,7 +734,8 @@ static int __init oom_init(void)
 {
 	oom_reaper_th = kthread_run(oom_reaper, NULL, "oom_reaper");
 #ifdef CONFIG_SYSCTL
-	register_sysctl_init("vm", vm_oom_kill_table);
+	register_sysctl_init("vm", vm_oom_kill_table,
+			     ARRAY_SIZE(vm_oom_kill_table));
 #endif
 	return 0;
 }
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index db7943999007..9f997de8d12f 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2320,7 +2320,8 @@ void __init page_writeback_init(void)
 	cpuhp_setup_state(CPUHP_MM_WRITEBACK_DEAD, "mm/writeback:dead", NULL,
 			  page_writeback_cpu_online);
 #ifdef CONFIG_SYSCTL
-	register_sysctl_init("vm", vm_page_writeback_sysctls);
+	register_sysctl_init("vm", vm_page_writeback_sysctls,
+			     ARRAY_SIZE(vm_page_writeback_sysctls));
 #endif
 }
 
diff --git a/security/keys/sysctl.c b/security/keys/sysctl.c
index b72b82bb20c6..fa305f74f658 100644
--- a/security/keys/sysctl.c
+++ b/security/keys/sysctl.c
@@ -71,7 +71,7 @@ struct ctl_table key_sysctls[] = {
 
 static int __init init_security_keys_sysctls(void)
 {
-	register_sysctl_init("kernel/keys", key_sysctls);
+	register_sysctl_init("kernel/keys", key_sysctls, ARRAY_SIZE(key_sysctls));
 	return 0;
 }
 early_initcall(init_security_keys_sysctls);
-- 
2.30.2

Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Jiri Slaby]

On 21. 06. 23, 11:09, Joel Granados wrote:
> In order to remove the end element from the ctl_table struct arrays, we
> explicitly define the size when registering the targes. We add a size
> argument to the register_sysctl_init call and pass an ARRAY_SIZE for all
> the callers.

Hi, I am missing here (or in 00/00) _why_ you are doing that. Is it by a 
chance those saved 9k? I hope not.

thanks,
-- 
js
suse labs

Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Joel Granados]

[-- Attachment #1: Type: text/plain, Size: 1038 bytes --]

On Wed, Jun 21, 2023 at 11:56:03AM +0200, Jiri Slaby wrote:
> On 21. 06. 23, 11:09, Joel Granados wrote:
> > In order to remove the end element from the ctl_table struct arrays, we
> > explicitly define the size when registering the targes. We add a size
> > argument to the register_sysctl_init call and pass an ARRAY_SIZE for all
> > the callers.
> 
> Hi, I am missing here (or in 00/00) _why_ you are doing that. Is it by a
Not sure what happened. I used the kernels get_maintainers.pl script
together with git-send-email. These are my settings:

"
tocmd ="`pwd`/scripts/get_maintainer.pl --nogit --nogit-fallback --norolestats --m --nol --nor"
cccmd ="`pwd`/scripts/get_maintainer.pl --nogit --nogit-fallback --norolestats --l --r --nom"
"

Could it be that there is an error in MAINTAINERS?

> chance those saved 9k? I hope not.
Not by chance. It is an expected consequence of removing the empty sentinel
element from ctl_table arrays

Best
> 
> thanks,
> -- 
> js
> suse labs
> 

-- 

Joel Granados

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Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Jiri Slaby]

On 21. 06. 23, 15:11, Joel Granados wrote:
> On Wed, Jun 21, 2023 at 11:56:03AM +0200, Jiri Slaby wrote:
>> On 21. 06. 23, 11:09, Joel Granados wrote:
>>> In order to remove the end element from the ctl_table struct arrays, we
>>> explicitly define the size when registering the targes. We add a size
>>> argument to the register_sysctl_init call and pass an ARRAY_SIZE for all
>>> the callers.
>>
>> Hi, I am missing here (or in 00/00) _why_ you are doing that. Is it by a
> Not sure what happened. I used the kernels get_maintainers.pl script
> together with git-send-email. These are my settings:
> 
> "
> tocmd ="`pwd`/scripts/get_maintainer.pl --nogit --nogit-fallback --norolestats --m --nol --nor"
> cccmd ="`pwd`/scripts/get_maintainer.pl --nogit --nogit-fallback --norolestats --l --r --nom"
> "
> 
> Could it be that there is an error in MAINTAINERS?

Sorry, I don't see what you are asking about. I was asking about 
motivation behind the series. That is a must in commit logs.

thanks,
-- 
js
suse labs

Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Joel Granados]

[-- Attachment #1: Type: text/plain, Size: 2108 bytes --]

On Thu, Jun 22, 2023 at 06:25:15AM +0200, Jiri Slaby wrote:
> On 21. 06. 23, 15:11, Joel Granados wrote:
> > On Wed, Jun 21, 2023 at 11:56:03AM +0200, Jiri Slaby wrote:
> > > On 21. 06. 23, 11:09, Joel Granados wrote:
> > > > In order to remove the end element from the ctl_table struct arrays, we
> > > > explicitly define the size when registering the targes. We add a size
> > > > argument to the register_sysctl_init call and pass an ARRAY_SIZE for all
> > > > the callers.
> > > 
> > > Hi, I am missing here (or in 00/00) _why_ you are doing that. Is it by a
> > Not sure what happened. I used the kernels get_maintainers.pl script
> > together with git-send-email. These are my settings:
> > 
> > "
> > tocmd ="`pwd`/scripts/get_maintainer.pl --nogit --nogit-fallback --norolestats --m --nol --nor"
> > cccmd ="`pwd`/scripts/get_maintainer.pl --nogit --nogit-fallback --norolestats --l --r --nom"
> > "
> > 
> > Could it be that there is an error in MAINTAINERS?
> 
> Sorry, I don't see what you are asking about. I was asking about motivation
I thought you were telling me that you were missing in the 00/00 :). I
misread, sorry.

> behind the series. That is a must in commit logs.
I see now that just saying "this is part of the effort to remove the
last empty element", does not put all this in to context. I spent some
time looking into the lists for some context and I think Luis summarizes
it quite nicely here
https://lore.kernel.org/all/20230302204612.782387-1-mcgrof@kernel.org/.

As I read it removing the last empty element from the ctl_table arrays
is part of a greater effort to remove the clutter in kernel/sysctl.c.

Here is one that actually hints at the ARRAY_SIZE solution.
https://lore.kernel.org/all/20230302202826.776286-1-mcgrof@kernel.org/

Here are some other threads that mention the overall effort:
https://lore.kernel.org/all/20230321130908.6972-1-frank.li@vivo.com
https://lore.kernel.org/all/20220220060626.15885-1-tangmeng@uniontech.com

I will add a better motivational part to V2

Thx for the feedback

--

Joel Granados

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Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Greg Kroah-Hartman]

On Wed, Jun 21, 2023 at 11:09:57AM +0200, Joel Granados wrote:
>  static int __init random_sysctls_init(void)
>  {
> -	register_sysctl_init("kernel/random", random_table);
> +	register_sysctl_init("kernel/random", random_table,
> +			     ARRAY_SIZE(random_table));

As mentioned before, why not just do:

#define register_sysctl_init(string, table)	\
	__register_sysctl_init(string, table, ARRAY_SIZE(table);

or something like that?

That way no callers need to change AND you prevent the size from ever
being incorrect?

thanks,

greg k-h

Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Joel Granados]

[-- Attachment #1: Type: text/plain, Size: 762 bytes --]

On Wed, Jun 21, 2023 at 12:47:58PM +0200, Greg Kroah-Hartman wrote:
> On Wed, Jun 21, 2023 at 11:09:57AM +0200, Joel Granados wrote:
> >  static int __init random_sysctls_init(void)
> >  {
> > -	register_sysctl_init("kernel/random", random_table);
> > +	register_sysctl_init("kernel/random", random_table,
> > +			     ARRAY_SIZE(random_table));
> 
> As mentioned before, why not just do:
> 
> #define register_sysctl_init(string, table)	\
> 	__register_sysctl_init(string, table, ARRAY_SIZE(table);
Answered you in the original mail where you suggested it.

Best
> 
> or something like that?
> 
> That way no callers need to change AND you prevent the size from ever
> being incorrect?
> 
> thanks,
> 
> greg k-h

-- 

Joel Granados

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Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Jiri Slaby]

On 21. 06. 23, 15:15, Joel Granados wrote:
> On Wed, Jun 21, 2023 at 12:47:58PM +0200, Greg Kroah-Hartman wrote:
>> On Wed, Jun 21, 2023 at 11:09:57AM +0200, Joel Granados wrote:
>>>   static int __init random_sysctls_init(void)
>>>   {
>>> -	register_sysctl_init("kernel/random", random_table);
>>> +	register_sysctl_init("kernel/random", random_table,
>>> +			     ARRAY_SIZE(random_table));
>>
>> As mentioned before, why not just do:
>>
>> #define register_sysctl_init(string, table)	\
>> 	__register_sysctl_init(string, table, ARRAY_SIZE(table);
> Answered you in the original mail where you suggested it.

I am curious what that was, do you have a link?

-- 
js
suse labs

Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Joel Granados]

[-- Attachment #1: Type: text/plain, Size: 958 bytes --]

On Thu, Jun 22, 2023 at 06:21:48AM +0200, Jiri Slaby wrote:
> On 21. 06. 23, 15:15, Joel Granados wrote:
> > On Wed, Jun 21, 2023 at 12:47:58PM +0200, Greg Kroah-Hartman wrote:
> > > On Wed, Jun 21, 2023 at 11:09:57AM +0200, Joel Granados wrote:
> > > >   static int __init random_sysctls_init(void)
> > > >   {
> > > > -	register_sysctl_init("kernel/random", random_table);
> > > > +	register_sysctl_init("kernel/random", random_table,
> > > > +			     ARRAY_SIZE(random_table));
> > > 
> > > As mentioned before, why not just do:
> > > 
> > > #define register_sysctl_init(string, table)	\
> > > 	__register_sysctl_init(string, table, ARRAY_SIZE(table);
> > Answered you in the original mail where you suggested it.
> 
> I am curious what that was, do you have a link?
of course. I think you will find it here https://lore.kernel.org/all/20230621123816.ufqbob6qthz4hujx@localhost/
> 
> -- 
> js
> suse labs
> 

-- 

Joel Granados

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Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Petr Mladek]

On Thu 2023-06-22 16:00:21, Joel Granados wrote:
> On Thu, Jun 22, 2023 at 06:21:48AM +0200, Jiri Slaby wrote:
> > On 21. 06. 23, 15:15, Joel Granados wrote:
> > > On Wed, Jun 21, 2023 at 12:47:58PM +0200, Greg Kroah-Hartman wrote:
> > > > On Wed, Jun 21, 2023 at 11:09:57AM +0200, Joel Granados wrote:
> > > > >   static int __init random_sysctls_init(void)
> > > > >   {
> > > > > -	register_sysctl_init("kernel/random", random_table);
> > > > > +	register_sysctl_init("kernel/random", random_table,
> > > > > +			     ARRAY_SIZE(random_table));
> > > > 
> > > > As mentioned before, why not just do:
> > > > 
> > > > #define register_sysctl_init(string, table)	\
> > > > 	__register_sysctl_init(string, table, ARRAY_SIZE(table);
> > > Answered you in the original mail where you suggested it.
> > 
> > I am curious what that was, do you have a link?
> of course. I think you will find it here https://lore.kernel.org/all/20230621123816.ufqbob6qthz4hujx@localhost/

Let me to copy the answer here:

<paste>
I considered this at the outset, but it will not work with callers that
use a pointer instead of the actual array.
Additionally, we would not avoid big commits as we would have to go
looking in all the files where register is called directly or indirectly
and make sure the logic is sound.
</paste>

For the callers using a pointer. A solution would be to create another
wrapper which would take the array size, e.g.

#define register_sysctl_init_limited(string, table, size)	\
	__register_sysctl_init(string, table, size);


And ARRAY_SIZE() is defined in include/linux/kernel.h as:

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))

It will create a compiler error when either an array[] or *array is
passed.

When using this:

1. The compiler will tell us where the other wrapper is needed.

2. Some locations might need the @size parameter even when a static
   array is passed. For example, neigh_sysctl_register() terminates
   the array early.

   But this will work when __register_sysctl_init() supports
   both ways.I mean that it will stop either on @size or empty
   element, as discussed in the other subthread.

   This should be caught when the final "empty" is removed
   from the particular caller.

Best Regards,
Petr

Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Petr Mladek]

On Wed 2023-06-21 11:09:57, Joel Granados wrote:
> In order to remove the end element from the ctl_table struct arrays, we
> explicitly define the size when registering the targes. We add a size
> argument to the register_sysctl_init call and pass an ARRAY_SIZE for all
> the callers.

This does not explain the motivatin why the end element is removed.

I agree with Jiri that saving 9k is a questionable gain. According to
the cover letter it saved 0,00%. It is because it saved 9k with allyes
config which produces huge kernel. IMHO, the 9k might be interesting
only for a tiny kernel. But I guess that it would safe much less
bytes there.

And the code with the added ARRAY_SIZE() parameter looks worse than before.

> diff --git a/kernel/printk/sysctl.c b/kernel/printk/sysctl.c
> index c228343eeb97..28f37b86414e 100644
> --- a/kernel/printk/sysctl.c
> +++ b/kernel/printk/sysctl.c
> @@ -81,5 +81,6 @@ static struct ctl_table printk_sysctls[] = {
>  
>  void __init printk_sysctl_init(void)
>  {
> -	register_sysctl_init("kernel", printk_sysctls);
> +	register_sysctl_init("kernel", printk_sysctls,
> +			     ARRAY_SIZE(printk_sysctls));
>  }

Is register_sysctl_init() still ready to handle the last empty element,
please? I am not in Cc on the related patches.

Best Regards,
Petr

Re: [PATCH 08/11] sysctl: Add size to register_sysctl_init

[Joel Granados]

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On Wed, Jun 21, 2023 at 01:36:46PM +0200, Petr Mladek wrote:
> On Wed 2023-06-21 11:09:57, Joel Granados wrote:
> > In order to remove the end element from the ctl_table struct arrays, we
> > explicitly define the size when registering the targes. We add a size
> > argument to the register_sysctl_init call and pass an ARRAY_SIZE for all
> > the callers.
> 
> This does not explain the motivatin why the end element is removed.
I also see that the cover letter also lacks this. Let me clarify in my
V2.

> 
> I agree with Jiri that saving 9k is a questionable gain. According to
> the cover letter it saved 0,00%. It is because it saved 9k with allyes
> config which produces huge kernel. IMHO, the 9k might be interesting
> only for a tiny kernel. But I guess that it would safe much less
> bytes there.
I put the 9K as a upper bound kind of value. To get an idea of exactly
how much we are talking about. A lower bound with tiny config and sysctl
enabled is a good idea to give a range.

> 
> And the code with the added ARRAY_SIZE() parameter looks worse than before.
This might not even be an issue in V2. After analysing Greg's feedback,
these might just go away.
> 
> > diff --git a/kernel/printk/sysctl.c b/kernel/printk/sysctl.c
> > index c228343eeb97..28f37b86414e 100644
> > --- a/kernel/printk/sysctl.c
> > +++ b/kernel/printk/sysctl.c
> > @@ -81,5 +81,6 @@ static struct ctl_table printk_sysctls[] = {
> >  
> >  void __init printk_sysctl_init(void)
> >  {
> > -	register_sysctl_init("kernel", printk_sysctls);
> > +	register_sysctl_init("kernel", printk_sysctls,
> > +			     ARRAY_SIZE(printk_sysctls));
> >  }
> 
> Is register_sysctl_init() still ready to handle the last empty element,
nope, after all the patch set, this functionality would be gone.

> please? I am not in Cc on the related patches.
Not sure what happened there. Should I just add you for the next batch?

> 
> Best Regards,
> Petr

Thx for the feedback

Best
-- 

Joel Granados

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