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s390: simplify dynamic sysctl registration for appldata_register_ops 

The routine appldata_register_ops() allocates a sysctl table
with 4 entries. The firsts one,   ops->ctl_table[0] is the parent directory
with an empty entry following it, ops->ctl_table[1]. The next entry is
for the ops->name and that is     ops->ctl_table[2]. It needs an empty
entry following that, and that is ops->ctl_table[3]. And so hence the
kcalloc(4, sizeof(struct ctl_table), GFP_KERNEL).

We can simplify this considerably since sysctl_register("foo", table)
can create the parent directory for us if it does not exist. So we
can just remove the first two entries and move back the ops->name to
the first entry, and just use kcalloc(2, ...).

[gor@linux.ibm.com: appldata_generic_handler fixup ctl_table index 2->0]
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20230310234525.3986352-7-mcgrof@kernel.org
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Luis Chamberlain 2023-03-10 15:45:25 -08:00 committed by Heiko Carstens
parent 7ddc873dcb
commit 7db1224630
1 changed files with 8 additions and 12 deletions
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20
arch/s390/appldata/appldata_base.c
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@ -281,7 +281,7 @@ appldata_generic_handler(struct ctl_table *ctl, int write,
mutex_lock(&appldata_ops_mutex);
list_for_each(lh, &appldata_ops_list) {
tmp_ops = list_entry(lh, struct appldata_ops, list);
if (&tmp_ops->ctl_table[2] == ctl) {
if (&tmp_ops->ctl_table[0] == ctl) {
found = 1;
}
}
@ -351,7 +351,8 @@ int appldata_register_ops(struct appldata_ops *ops)
if (ops->size > APPLDATA_MAX_REC_SIZE)
return -EINVAL;
ops->ctl_table = kcalloc(4, sizeof(struct ctl_table), GFP_KERNEL);
/* The last entry must be an empty one */
ops->ctl_table = kcalloc(2, sizeof(struct ctl_table), GFP_KERNEL);
if (!ops->ctl_table)
return -ENOMEM;
@ -359,17 +360,12 @@ int appldata_register_ops(struct appldata_ops *ops)
list_add(&ops->list, &appldata_ops_list);
mutex_unlock(&appldata_ops_mutex);
ops->ctl_table[0].procname = appldata_proc_name;
ops->ctl_table[0].maxlen = 0;
ops->ctl_table[0].mode = S_IRUGO | S_IXUGO;
ops->ctl_table[0].child = &ops->ctl_table[2];
ops->ctl_table[0].procname = ops->name;
ops->ctl_table[0].mode = S_IRUGO | S_IWUSR;
ops->ctl_table[0].proc_handler = appldata_generic_handler;
ops->ctl_table[0].data = ops;
ops->ctl_table[2].procname = ops->name;
ops->ctl_table[2].mode = S_IRUGO | S_IWUSR;
ops->ctl_table[2].proc_handler = appldata_generic_handler;
ops->ctl_table[2].data = ops;
ops->sysctl_header = register_sysctl_table(ops->ctl_table);
ops->sysctl_header = register_sysctl(appldata_proc_name, ops->ctl_table);
if (!ops->sysctl_header)
goto out;
return 0;