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sysctl: Remove register_sysctl_table
This is part of the general push to deprecate register_sysctl_paths and register_sysctl_table. After removing all the calling functions, we remove both the register_sysctl_table function and the documentation check that appeared in check-sysctl-docs awk script. We save 595 bytes with this change: ./scripts/bloat-o-meter vmlinux.1.refactor-base-paths vmlinux.2.remove-sysctl-table add/remove: 2/8 grow/shrink: 1/0 up/down: 1154/-1749 (-595) Function old new delta count_subheaders - 983 +983 unregister_sysctl_table 29 184 +155 __pfx_count_subheaders - 16 +16 __pfx_unregister_sysctl_table.part 16 - -16 __pfx_register_leaf_sysctl_tables.constprop 16 - -16 __pfx_count_subheaders.part 16 - -16 __pfx___register_sysctl_base 16 - -16 unregister_sysctl_table.part 136 - -136 __register_sysctl_base 478 - -478 register_leaf_sysctl_tables.constprop 524 - -524 count_subheaders.part 547 - -547 Total: Before=21257652, After=21257057, chg -0.00% [mcgrof: remove register_leaf_sysctl_tables and append_path too and add bloat-o-meter stats] Signed-off-by: Joel Granados <j.granados@samsung.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Acked-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Joel Granados
Luis Chamberlain
parent
2f5edd03ca
commit
b8cbc0855a
@ -1466,19 +1466,6 @@ void __init __register_sysctl_init(const char *path, struct ctl_table *table,
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kmemleak_not_leak(hdr);
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}
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static char *append_path(const char *path, char *pos, const char *name)
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{
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int namelen;
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namelen = strlen(name);
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if (((pos - path) + namelen + 2) >= PATH_MAX)
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return NULL;
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memcpy(pos, name, namelen);
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pos[namelen] = '/';
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pos[namelen + 1] = '\0';
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pos += namelen + 1;
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return pos;
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}
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static int count_subheaders(struct ctl_table *table)
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{
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int has_files = 0;
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@ -1498,152 +1485,6 @@ static int count_subheaders(struct ctl_table *table)
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return nr_subheaders + has_files;
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}
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static int register_leaf_sysctl_tables(const char *path, char *pos,
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struct ctl_table_header ***subheader, struct ctl_table_set *set,
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struct ctl_table *table)
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{
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struct ctl_table *ctl_table_arg = NULL;
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struct ctl_table *entry, *files;
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int nr_files = 0;
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int nr_dirs = 0;
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int err = -ENOMEM;
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list_for_each_table_entry(entry, table) {
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if (entry->child)
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nr_dirs++;
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else
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nr_files++;
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}
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files = table;
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/* If there are mixed files and directories we need a new table */
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if (nr_dirs && nr_files) {
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struct ctl_table *new;
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files = kcalloc(nr_files + 1, sizeof(struct ctl_table),
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GFP_KERNEL);
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if (!files)
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goto out;
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ctl_table_arg = files;
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new = files;
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list_for_each_table_entry(entry, table) {
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if (entry->child)
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continue;
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*new = *entry;
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new++;
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}
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}
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/* Register everything except a directory full of subdirectories */
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if (nr_files || !nr_dirs) {
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struct ctl_table_header *header;
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header = __register_sysctl_table(set, path, files);
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if (!header) {
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kfree(ctl_table_arg);
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goto out;
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}
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/* Remember if we need to free the file table */
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header->ctl_table_arg = ctl_table_arg;
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**subheader = header;
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(*subheader)++;
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}
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/* Recurse into the subdirectories. */
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list_for_each_table_entry(entry, table) {
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char *child_pos;
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if (!entry->child)
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continue;
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err = -ENAMETOOLONG;
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child_pos = append_path(path, pos, entry->procname);
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if (!child_pos)
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goto out;
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err = register_leaf_sysctl_tables(path, child_pos, subheader,
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set, entry->child);
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pos[0] = '\0';
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if (err)
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goto out;
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}
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err = 0;
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out:
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/* On failure our caller will unregister all registered subheaders */
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return err;
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}
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/**
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* register_sysctl_table - register a sysctl table hierarchy
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* @table: the top-level table structure
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*
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* Register a sysctl table hierarchy. @table should be a filled in ctl_table
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* array. A completely 0 filled entry terminates the table.
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* We are slowly deprecating this call so avoid its use.
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*/
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static struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
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{
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struct ctl_table *ctl_table_arg = table;
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int nr_subheaders = count_subheaders(table);
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struct ctl_table_header *header = NULL, **subheaders, **subheader;
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char *new_path, *pos;
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pos = new_path = kmalloc(PATH_MAX, GFP_KERNEL);
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if (!new_path)
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return NULL;
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pos[0] = '\0';
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while (table->procname && table->child && !table[1].procname) {
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pos = append_path(new_path, pos, table->procname);
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if (!pos)
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goto out;
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table = table->child;
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}
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if (nr_subheaders == 1) {
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header = __register_sysctl_table(&sysctl_table_root.default_set, new_path, table);
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if (header)
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header->ctl_table_arg = ctl_table_arg;
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} else {
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header = kzalloc(sizeof(*header) +
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sizeof(*subheaders)*nr_subheaders, GFP_KERNEL);
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if (!header)
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goto out;
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subheaders = (struct ctl_table_header **) (header + 1);
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subheader = subheaders;
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header->ctl_table_arg = ctl_table_arg;
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if (register_leaf_sysctl_tables(new_path, pos, &subheader,
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&sysctl_table_root.default_set, table))
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goto err_register_leaves;
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}
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out:
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kfree(new_path);
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return header;
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err_register_leaves:
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while (subheader > subheaders) {
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struct ctl_table_header *subh = *(--subheader);
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struct ctl_table *table = subh->ctl_table_arg;
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unregister_sysctl_table(subh);
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kfree(table);
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}
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kfree(header);
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header = NULL;
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goto out;
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}
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int __register_sysctl_base(struct ctl_table *base_table)
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{
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struct ctl_table_header *hdr;
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hdr = register_sysctl_table(base_table);
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kmemleak_not_leak(hdr);
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return 0;
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}
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static void put_links(struct ctl_table_header *header)
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{
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struct ctl_table_set *root_set = &sysctl_table_root.default_set;
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@ -146,16 +146,6 @@ curtable && /\.procname[\t ]*=[\t ]*".+"/ {
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children[curtable][curentry] = child
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}
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/register_sysctl_table\(.*\)/ {
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match($0, /register_sysctl_table\(([^)]+)\)/, tables)
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if (debug) print "Registering table " tables[1]
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if (children[tables[1]][table]) {
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for (entry in entries[children[tables[1]][table]]) {
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printentry(entry)
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}
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}
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}
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END {
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for (entry in documented) {
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if (!seen[entry]) {
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