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net: Remove the now superfluous sentinel elements from ctl_table array

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This commit comes at the tail end of a greater effort to remove the
empty elements at the end of the ctl_table arrays (sentinels) which
will reduce the overall build time size of the kernel and run time
memory bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)

* Remove sentinel element from ctl_table structs.
* Remove the zeroing out of an array element (to make it look like a
  sentinel) in neigh_sysctl_register and lowpan_frags_ns_sysctl_register
  This is not longer needed and is safe after commit c899710fe7
  ("networking: Update to register_net_sysctl_sz") added the array size
  to the ctl_table registration.
* Replace the for loop stop condition in sysctl_core_net_init that tests
  for procname == NULL with one that depends on array size
* Removed the "-1" in mpls_net_init that adjusted for having an extra
  empty element when looping over ctl_table arrays
* Use a table_size variable to keep the value of ARRAY_SIZE

Signed-off-by: Joel Granados <j.granados@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joel Granados
2024-05-01 11:29:25 +02:00
committed by David S. Miller
parent a17ef9e6c2
commit ce218712b0
6 changed files with 14 additions and 26 deletions
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13
net/mpls/af_mpls.c
View File

@ -1377,13 +1377,13 @@ static const struct ctl_table mpls_dev_table[] = {
.proc_handler = mpls_conf_proc,
.data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
},
{ }
};
static int mpls_dev_sysctl_register(struct net_device *dev,
struct mpls_dev *mdev)
{
char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
size_t table_size = ARRAY_SIZE(mpls_dev_table);
struct net *net = dev_net(dev);
struct ctl_table *table;
int i;
@ -1395,7 +1395,7 @@ static int mpls_dev_sysctl_register(struct net_device *dev,
/* Table data contains only offsets relative to the base of
* the mdev at this point, so make them absolute.
*/
for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) {
for (i = 0; i < table_size; i++) {
table[i].data = (char *)mdev + (uintptr_t)table[i].data;
table[i].extra1 = mdev;
table[i].extra2 = net;
@ -1403,8 +1403,7 @@ static int mpls_dev_sysctl_register(struct net_device *dev,
snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
mdev->sysctl = register_net_sysctl_sz(net, path, table,
ARRAY_SIZE(mpls_dev_table));
mdev->sysctl = register_net_sysctl_sz(net, path, table, table_size);
if (!mdev->sysctl)
goto free;
@ -2653,11 +2652,11 @@ static const struct ctl_table mpls_table[] = {
.extra1 = SYSCTL_ONE,
.extra2 = &ttl_max,
},
{ }
};
static int mpls_net_init(struct net *net)
{
size_t table_size = ARRAY_SIZE(mpls_table);
struct ctl_table *table;
int i;
@ -2673,11 +2672,11 @@ static int mpls_net_init(struct net *net)
/* Table data contains only offsets relative to the base of
* the mdev at this point, so make them absolute.
*/
for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++)
for (i = 0; i < table_size; i++)
table[i].data = (char *)net + (uintptr_t)table[i].data;
net->mpls.ctl = register_net_sysctl_sz(net, "net/mpls", table,
ARRAY_SIZE(mpls_table));
table_size);
if (net->mpls.ctl == NULL) {
kfree(table);
return -ENOMEM;