diff mbox series

[3/8] sysctl: Remove check for sentinel element in ctl_table arrays

Message ID 20240604-jag-sysctl_remset-v1-3-2df7ecdba0bd@samsung.com (mailing list archive)
State New
Headers show
Series [1/8] locking: Remove superfluous sentinel element from kern_lockdep_table | expand

Commit Message

Joel Granados via B4 Relay June 4, 2024, 6:29 a.m. UTC 
From: Joel Granados <j.granados@samsung.com>

Use ARRAY_SIZE exclusively by removing the check to ->procname in the
stopping criteria of the loops traversing ctl_table arrays. This commit
finalizes the removal of the sentinel elements at the end of ctl_table
arrays which reduces the build time size and run time memory bloat by
~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)

Remove the entry->procname evaluation from the for loop stopping
criteria in sysctl and sysctl_net.

Signed-off-by: Joel Granados <j.granados@samsung.com>
---
 fs/proc/proc_sysctl.c |  2 +-
 net/sysctl_net.c      | 11 ++---------
 2 files changed, 3 insertions(+), 10 deletions(-)

Comments

Joel Granados June 4, 2024, 6:48 a.m. UTC | #1 
On Tue, Jun 04, 2024 at 08:29:21AM +0200, Joel Granados via B4 Relay wrote:
> From: Joel Granados <j.granados@samsung.com>
> --- a/net/sysctl_net.c
> +++ b/net/sysctl_net.c
> @@ -127,7 +127,7 @@ static void ensure_safe_net_sysctl(struct net *net, const char *path,
>  
>  	pr_debug("Registering net sysctl (net %p): %s\n", net, path);
>  	ent = table;
> -	for (size_t i = 0; i < table_size && ent->procname; ent++, i++) {
> +	for (size_t i = 0; i < table_size; ent++, i++) {
>  		unsigned long addr;
>  		const char *where;
>  
> @@ -165,17 +165,10 @@ struct ctl_table_header *register_net_sysctl_sz(struct net *net,
>  						struct ctl_table *table,
>  						size_t table_size)
>  {
> -	int count;
> -	struct ctl_table *entry;
> -
>  	if (!net_eq(net, &init_net))
>  		ensure_safe_net_sysctl(net, path, table, table_size);
>  
> -	entry = table;
> -	for (count = 0 ; count < table_size && entry->procname; entry++, count++)
> -		;
> -
> -	return __register_sysctl_table(&net->sysctls, path, table, count);
> +	return __register_sysctl_table(&net->sysctls, path, table, table_size);
>  }
>  EXPORT_SYMBOL_GPL(register_net_sysctl_sz);
>  

Given that this is a very small network related patch, I'm queueing this
in through the sysctl-next branch. Please let me know if you would
rather take it through the networking workflow.

Best
diff mbox series

Patch

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index b1c2c0b82116..d4ba7ad9dbe0 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -21,7 +21,7 @@ 
 
 #define list_for_each_table_entry(entry, header)	\
 	entry = header->ctl_table;			\
-	for (size_t i = 0 ; i < header->ctl_table_size && entry->procname; ++i, entry++)
+	for (size_t i = 0 ; i < header->ctl_table_size; ++i, entry++)
 
 static const struct dentry_operations proc_sys_dentry_operations;
 static const struct file_operations proc_sys_file_operations;
diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index f5017012a049..19e8048241ba 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -127,7 +127,7 @@  static void ensure_safe_net_sysctl(struct net *net, const char *path,
 
 	pr_debug("Registering net sysctl (net %p): %s\n", net, path);
 	ent = table;
-	for (size_t i = 0; i < table_size && ent->procname; ent++, i++) {
+	for (size_t i = 0; i < table_size; ent++, i++) {
 		unsigned long addr;
 		const char *where;
 
@@ -165,17 +165,10 @@  struct ctl_table_header *register_net_sysctl_sz(struct net *net,
 						struct ctl_table *table,
 						size_t table_size)
 {
-	int count;
-	struct ctl_table *entry;
-
 	if (!net_eq(net, &init_net))
 		ensure_safe_net_sysctl(net, path, table, table_size);
 
-	entry = table;
-	for (count = 0 ; count < table_size && entry->procname; entry++, count++)
-		;
-
-	return __register_sysctl_table(&net->sysctls, path, table, count);
+	return __register_sysctl_table(&net->sysctls, path, table, table_size);
 }
 EXPORT_SYMBOL_GPL(register_net_sysctl_sz);