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sysctl: Remove check for sentinel element in ctl_table arrays

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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>
This commit is contained in:
Joel Granados 2024-06-04 08:29:21 +02:00
parent e2a6c472de
commit d7a76ec871
2 changed files with 3 additions and 10 deletions
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2
fs/proc/proc_sysctl.c
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@ -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;

11
net/sysctl_net.c
View file

@ -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);