The kernel installs a modules.builtin file listing all builtin
modules. Let depmod generate a modules.builtin.bin file and use
this in modprobe: If a module is not found in modules.dep or
modules.alias, check if the module is builtin and print
"builtin <module>" instead of trying to load anything.
It is done in this order to not slow down the common case.
Signed-off-by: Michal Marek <mmarek@xxxxxxx>
---
depmod.c | 46 +++++++++++++++++++++++++++++++++++++++++++++-
modprobe.c | 23 +++++++++++++++++++++++
2 files changed, 68 insertions(+), 1 deletions(-)
diff --git a/depmod.c b/depmod.c
index 3ac5070..43ff28f 100644
--- a/depmod.c
+++ b/depmod.c
@@ -825,6 +825,49 @@ static int output_symbols_bin(struct module *unused, FILE *out, char *dirname)
return 1;
}
+static int output_builtin_bin(struct module *unused, FILE *out, char *dirname)
+{
+ struct index_node *index;
+ char *textfile, *line;
+ unsigned int linenum;
+ FILE *f;
+
+ nofail_asprintf(&textfile, "%s/modules.builtin", dirname);
+ if (!(f = fopen(textfile, "r"))) {
+ if (errno != ENOENT)
+ fatal("Could not open '%s': %s\n",
+ textfile, strerror(errno));
+ free(textfile);
+ return 0;
+ }
+ free(textfile);
+ index = index_create();
+
+ while ((line = getline_wrapped(f, &linenum)) != NULL) {
+ char *module = strrchr(line, '/');
+
+ if (!*line || *line == '#') {
+ free(line);
+ continue;
+ }
+ module = strrchr(line, '/');
+ if (module)
+ module++;
+ else
+ module = line;
+ if (ends_in(module, ".ko"))
+ module[strlen(module) - 3] = '\0';
+ underscores(module);
+ index_insert(index, module, "", 0);
+ free(line);
+ }
+ fclose(f);
+ index_write(index, out);
+ index_destroy(index);
+
+ return 1;
+}
+
static int output_aliases(struct module *modules, FILE *out, char *dirname)
{
struct module *i;
@@ -932,7 +975,8 @@ static struct depfile depfiles[] = {
{ "modules.alias", output_aliases, 0 },
{ "modules.alias.bin", output_aliases_bin, 0 },
{ "modules.symbols", output_symbols, 0 },
- { "modules.symbols.bin", output_symbols_bin, 0 }
+ { "modules.symbols.bin", output_symbols_bin, 0 },
+ { "modules.builtin.bin", output_builtin_bin, 0 },
};
/* If we can't figure it out, it's safe to say "true". */
diff --git a/modprobe.c b/modprobe.c
index 21a3111..a17cfca 100644
--- a/modprobe.c
+++ b/modprobe.c
@@ -537,6 +537,24 @@ static int read_attribute(const char *filename, char *buf, size_t buflen)
return (s == NULL) ? -1 : 1;
}
+/* is this a built-in module?
+ * 0: no, 1: yes, -1: don't know
+ */
+static int module_builtin(const char *dirname, const char *modname)
+{
+ struct index_file *index;
+ char *filename, *value;
+
+ nofail_asprintf(&filename, "%s/modules.builtin.bin", dirname);
+ index = index_file_open(filename);
+ free(filename);
+ if (!index)
+ return -1;
+ value = index_search(index, modname);
+ free(value);
+ return value ? 1 : 0;
+}
+
/* Is module in /sys/module? If so, fill in usecount if not NULL.
0 means no, 1 means yes, -1 means unknown.
*/
@@ -1331,6 +1349,11 @@ int do_modprobe(char *modname,
modname, 0, flags & mit_remove,
&modoptions, &commands,
&aliases, &blacklist);
+ /* builtin module? */
+ if (!aliases && module_builtin(dirname, modname) == 1) {
+ info("builtin %s\n", modname);
+ return 0;
+ }
}
}
--
1.6.3.3
--
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