params: add 3rd arg to option handler callback signature

Add a 3rd arg, named "doing", to unknown-options callbacks invoked
from parse_args(). The arg is passed as:

  "Booting kernel" from start_kernel(),
  initcall_level_names[i] from do_initcall_level(),
  mod->name from load_module(), via parse_args(), parse_one()

parse_args() already has the "name" parameter, which is renamed to
"doing" to better reflect current uses 1,2 above.  parse_args() passes
it to an altered parse_one(), which now passes it down into the
unknown option handler callbacks.

The mod->name will be needed to handle dyndbg for loadable modules,
since params passed by modprobe are not qualified (they do not have a
"$modname." prefix), and by the time the unknown-param callback is
called, the module name is not otherwise available.

Minor tweaks:

Add param-name to parse_one's pr_debug(), current message doesnt
identify the param being handled, add it.

Add a pr_info to print current level and level_name of the initcall,
and number of registered initcalls at that level.  This adds 7 lines
to dmesg output, like:

   initlevel:6=device, 172 registered initcalls

Drop "parameters" from initcall_level_names[], its unhelpful in the
pr_info() added above.  This array is passed into parse_args() by
do_initcall_level().

CC: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 39 insertions, 28 deletions

diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index ea36486378d8..1b14d25162cb 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -320,7 +320,8 @@ extern int parse_args(const char *name,
                       unsigned num,
                       s16 level_min,
                       s16 level_max,
-                      int (*unknown)(char *param, char *val));
+                      int (*unknown)(char *param, char *val,
+                              const char *doing));
 
 /* Called by module remove. */
 #ifdef CONFIG_SYSFS
diff --git a/init/main.c b/init/main.c
index 9d454f09f3b1..11bc6f7ed866 100644
--- a/init/main.c
+++ b/init/main.c
@@ -229,7 +229,8 @@ early_param("loglevel", loglevel);
  * Unknown boot options get handed to init, unless they look like
  * unused parameters (modprobe will find them in /proc/cmdline).
  */
-static int __init unknown_bootoption(char *param, char *val)
+static int __init unknown_bootoption(char *param, char *val,
+                                const char *unused)
 {
         /* Change NUL term back to "=", to make "param" the whole string. */
         if (val) {
@@ -379,7 +380,7 @@ static noinline void __init_refok rest_init(void)
 }
 
 /* Check for early params. */
-static int __init do_early_param(char *param, char *val)
+static int __init do_early_param(char *param, char *val, const char *unused)
 {
         const struct obs_kernel_param *p;
 
@@ -722,17 +723,18 @@ static initcall_t *initcall_levels[] __initdata = {
 };
 
 static char *initcall_level_names[] __initdata = {
-        "early parameters",
-        "core parameters",
-        "postcore parameters",
-        "arch parameters",
-        "subsys parameters",
-        "fs parameters",
-        "device parameters",
-        "late parameters",
+        "early",
+        "core",
+        "postcore",
+        "arch",
+        "subsys",
+        "fs",
+        "device",
+        "late",
 };
 
-static int __init ignore_unknown_bootoption(char *param, char *val)
+static int __init ignore_unknown_bootoption(char *param, char *val,
+                                        const char *doing)
 {
         return 0;
 }
@@ -747,7 +749,7 @@ static void __init do_initcall_level(int level)
                    static_command_line, __start___param,
                    __stop___param - __start___param,
                    level, level,
-                   ignore_unknown_bootoption);
+                   &ignore_unknown_bootoption);
 
         for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
                 do_one_initcall(*fn);
@@ -757,8 +759,13 @@ static void __init do_initcalls(void)
 {
         int level;
 
-        for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
+        for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
+                pr_info("initlevel:%d=%s, %d registered initcalls\n",
+                        level, initcall_level_names[level],
+                        (int) (initcall_levels[level+1]
+                                - initcall_levels[level]));
                 do_initcall_level(level);
+        }
 }
 
 /*
diff --git a/kernel/params.c b/kernel/params.c
index f37d82631347..b60e2c74b961 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -85,11 +85,13 @@ bool parameq(const char *a, const char *b)
 
 static int parse_one(char *param,
                      char *val,
+                     const char *doing,
                      const struct kernel_param *params,
                      unsigned num_params,
                      s16 min_level,
                      s16 max_level,
-                     int (*handle_unknown)(char *param, char *val))
+                     int (*handle_unknown)(char *param, char *val,
+                                     const char *doing))
 {
         unsigned int i;
         int err;
@@ -104,8 +106,8 @@ static int parse_one(char *param,
                         if (!val && params[i].ops->set != param_set_bool
                             && params[i].ops->set != param_set_bint)
                                 return -EINVAL;
-                        pr_debug("They are equal!  Calling %p\n",
-                               params[i].ops->set);
+                        pr_debug("handling %s with %p\n", param,
+                                params[i].ops->set);
                         mutex_lock(&param_lock);
                         err = params[i].ops->set(val, &params[i]);
                         mutex_unlock(&param_lock);
@@ -114,11 +116,11 @@ static int parse_one(char *param,
         }
 
         if (handle_unknown) {
-                pr_debug("Unknown argument: calling %p\n", handle_unknown);
-                return handle_unknown(param, val);
+                pr_debug("doing %s: %s='%s'\n", doing, param, val);
+                return handle_unknown(param, val, doing);
         }
 
-        pr_debug("Unknown argument `%s'\n", param);
+        pr_debug("Unknown argument '%s'\n", param);
         return -ENOENT;
 }
 
@@ -175,28 +177,29 @@ static char *next_arg(char *args, char **param, char **val)
 }
 
 /* Args looks like "foo=bar,bar2 baz=fuz wiz". */
-int parse_args(const char *name,
+int parse_args(const char *doing,
                char *args,
                const struct kernel_param *params,
                unsigned num,
                s16 min_level,
                s16 max_level,
-               int (*unknown)(char *param, char *val))
+               int (*unknown)(char *param, char *val, const char *doing))
 {
         char *param, *val;
 
-        pr_debug("Parsing ARGS: %s\n", args);
-
         /* Chew leading spaces */
         args = skip_spaces(args);
 
+        if (args && *args)
+                pr_debug("doing %s, parsing ARGS: '%s'\n", doing, args);
+
         while (*args) {
                 int ret;
                 int irq_was_disabled;
 
                 args = next_arg(args, &param, &val);
                 irq_was_disabled = irqs_disabled();
-                ret = parse_one(param, val, params, num,
+                ret = parse_one(param, val, doing, params, num,
                                 min_level, max_level, unknown);
                 if (irq_was_disabled && !irqs_disabled()) {
                         printk(KERN_WARNING "parse_args(): option '%s' enabled "
@@ -205,19 +208,19 @@ int parse_args(const char *name,
                 switch (ret) {
                 case -ENOENT:
                         printk(KERN_ERR "%s: Unknown parameter `%s'\n",
-                               name, param);
+                               doing, param);
                         return ret;
                 case -ENOSPC:
                         printk(KERN_ERR
                                "%s: `%s' too large for parameter `%s'\n",
-                               name, val ?: "", param);
+                               doing, val ?: "", param);
                         return ret;
                 case 0:
                         break;
                 default:
                         printk(KERN_ERR
                                "%s: `%s' invalid for parameter `%s'\n",
-                               name, val ?: "", param);
+                               doing, val ?: "", param);
                         return ret;
                 }
         }