linux-kernel - [PATCH 5/8] sysctl: Remove superfluous empty allocations from sysctl internals

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Date: Tue, 04 Jun 2024 08:29:23 +0200
From: Joel Granados via B4 Relay <devnull+j.granados.samsung.com@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
 Boqun Feng <boqun.feng@...il.com>, Suren Baghdasaryan <surenb@...gle.com>, 
 Kent Overstreet <kent.overstreet@...ux.dev>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 Luis Chamberlain <mcgrof@...nel.org>, Kees Cook <keescook@...omium.org>, 
 Joel Granados <j.granados@...sung.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
 linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 5/8] sysctl: Remove superfluous empty allocations from
 sysctl internals

From: Joel Granados <j.granados@...sung.com>

Now that the sentinels have been removed from ctl_table arrays, there is
no need to artificially append empty ctl_table elements at ctl_table
registration. Remove superfluous empty allocation from new_dir and
new_links.

Signed-off-by: Joel Granados <j.granados@...sung.com>
---
 fs/proc/proc_sysctl.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 1babb54347a4..29d40f0ff3ff 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -951,14 +951,14 @@ static struct ctl_dir *new_dir(struct ctl_table_set *set,
 	char *new_name;

 	new = kzalloc(sizeof(*new) + sizeof(struct ctl_node) +
-		      sizeof(struct ctl_table)*2 +  namelen + 1,
+		      sizeof(struct ctl_table) +  namelen + 1,
 		      GFP_KERNEL);
 	if (!new)
 		return NULL;

 	node = (struct ctl_node *)(new + 1);
 	table = (struct ctl_table *)(node + 1);
-	new_name = (char *)(table + 2);
+	new_name = (char *)(table + 1);
 	memcpy(new_name, name, namelen);
 	table[0].procname = new_name;
 	table[0].mode = S_IFDIR|S_IRUGO|S_IXUGO;
@@ -1163,7 +1163,7 @@ static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table_

 	links = kzalloc(sizeof(struct ctl_table_header) +
 			sizeof(struct ctl_node)*head->ctl_table_size +
-			sizeof(struct ctl_table)*(head->ctl_table_size + 1) +
+			sizeof(struct ctl_table)*head->ctl_table_size +
 			name_bytes,
 			GFP_KERNEL);

@@ -1172,7 +1172,7 @@ static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table_

 	node = (struct ctl_node *)(links + 1);
 	link_table = (struct ctl_table *)(node + head->ctl_table_size);
-	link_name = (char *)&link_table[head->ctl_table_size + 1];
+	link_name = (char *)(link_table + head->ctl_table_size);
 	link = link_table;

 	list_for_each_table_entry(entry, head) {

-- 
2.43.0