module_param: remove support for bool parameters which are really int.

module_param(bool) used to counter-intuitively take an int.  In
fddd5201 (mid-2009) we allowed bool or int/unsigned int using a messy
trick.

This eliminates that code (though leaves the flags field in the struct,
for impending use).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

include/linux/moduleparam.h

@@ -47,9 +47,6 @@ struct kernel_param_ops {
 	void (*free)(void *arg);
 };
 
-/* Flag bits for kernel_param.flags */
-#define KPARAM_ISBOOL		2
-
 struct kernel_param {
 	const char *name;
 	const struct kernel_param_ops *ops;
@@ -131,8 +128,7 @@ struct kparam_array
  * The ops can have NULL set or get functions.
  */
 #define module_param_cb(name, ops, arg, perm)				      \
-	__module_param_call(MODULE_PARAM_PREFIX,			      \
-			    name, ops, arg, __same_type((arg), bool *), perm)
+	__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm)
 
 /* On alpha, ia64 and ppc64 relocations to global data cannot go into
    read-only sections (which is part of respective UNIX ABI on these
@@ -146,7 +142,7 @@ struct kparam_array
 
 /* This is the fundamental function for registering boot/module
    parameters. */
-#define __module_param_call(prefix, name, ops, arg, isbool, perm)	\
+#define __module_param_call(prefix, name, ops, arg, perm)		\
 	/* Default value instead of permissions? */			\
 	static int __param_perm_check_##name __attribute__((unused)) =	\
 	BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2))	\
@@ -155,8 +151,7 @@ struct kparam_array
 	static struct kernel_param __moduleparam_const __param_##name	\
 	__used								\
     __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \
-	= { __param_str_##name, ops, perm, isbool ? KPARAM_ISBOOL : 0,	\
-	    { arg } }
+	= { __param_str_##name, ops, perm, 0, { arg } }
 
 /* Obsolete - use module_param_cb() */
 #define module_param_call(name, set, get, arg, perm)			\
@@ -164,7 +159,6 @@ struct kparam_array
 		 { (void *)set, (void *)get };				\
 	__module_param_call(MODULE_PARAM_PREFIX,			\
 			    name, &__param_ops_##name, arg,		\
-			    __same_type(arg, bool *),			\
 			    (perm) + sizeof(__check_old_set_param(set))*0)
 
 /* We don't get oldget: it's often a new-style param_get_uint, etc. */
@@ -245,8 +239,7 @@ static inline void __kernel_param_unlock(void)
  */
 #define core_param(name, var, type, perm)				\
 	param_check_##type(name, &(var));				\
-	__module_param_call("", name, &param_ops_##type,		\
-			    &var, __same_type(var, bool), perm)
+	__module_param_call("", name, &param_ops_##type, &var, perm)
 #endif /* !MODULE */
 
 /**
@@ -264,7 +257,7 @@ static inline void __kernel_param_unlock(void)
 		= { len, string };					\
 	__module_param_call(MODULE_PARAM_PREFIX, name,			\
 			    &param_ops_string,				\
-			    .str = &__param_string_##name, 0, perm);	\
+			    .str = &__param_string_##name, perm);	\
 	__MODULE_PARM_TYPE(name, "string")
 
 /**
@@ -403,7 +396,7 @@ extern int param_set_bint(const char *val, const struct kernel_param *kp);
 	__module_param_call(MODULE_PARAM_PREFIX, name,			\
 			    &param_array_ops,				\
 			    .arr = &__param_arr_##name,			\
-			    __same_type(array[0], bool), perm);		\
+			    perm);					\
 	__MODULE_PARM_TYPE(name, "array of " #type)
 
 extern struct kernel_param_ops param_array_ops;

kernel/params.c

@@ -297,35 +297,18 @@ EXPORT_SYMBOL(param_ops_charp);
 /* Actually could be a bool or an int, for historical reasons. */
 int param_set_bool(const char *val, const struct kernel_param *kp)
 {
-	bool v;
-	int ret;
-
 	/* No equals means "set"... */
 	if (!val) val = "1";
 
 	/* One of =[yYnN01] */
-	ret = strtobool(val, &v);
-	if (ret)
-		return ret;
-
-	if (kp->flags & KPARAM_ISBOOL)
-		*(bool *)kp->arg = v;
-	else
-		*(int *)kp->arg = v;
-	return 0;
+	return strtobool(val, kp->arg);
 }
 EXPORT_SYMBOL(param_set_bool);
 
 int param_get_bool(char *buffer, const struct kernel_param *kp)
 {
-	bool val;
-	if (kp->flags & KPARAM_ISBOOL)
-		val = *(bool *)kp->arg;
-	else
-		val = *(int *)kp->arg;
-
 	/* Y and N chosen as being relatively non-coder friendly */
-	return sprintf(buffer, "%c", val ? 'Y' : 'N');
+	return sprintf(buffer, "%c", *(bool *)kp->arg ? 'Y' : 'N');
 }
 EXPORT_SYMBOL(param_get_bool);
 
@@ -343,7 +326,6 @@ int param_set_invbool(const char *val, const struct kernel_param *kp)
 	struct kernel_param dummy;
 
 	dummy.arg = &boolval;
-	dummy.flags = KPARAM_ISBOOL;
 	ret = param_set_bool(val, &dummy);
 	if (ret == 0)
 		*(bool *)kp->arg = !boolval;
@@ -372,7 +354,6 @@ int param_set_bint(const char *val, const struct kernel_param *kp)
 	/* Match bool exactly, by re-using it. */
 	boolkp = *kp;
 	boolkp.arg = &v;
-	boolkp.flags |= KPARAM_ISBOOL;
 
 	ret = param_set_bool(val, &boolkp);
 	if (ret == 0)