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

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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>
This commit is contained in:
Rusty Russell 2012-03-26 12:50:51 +10:30
parent 02608bef8f
commit 8b8252813d
2 changed files with 8 additions and 34 deletions
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19
include/linux/moduleparam.h
View File

@ -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;

23
kernel/params.c
View File

@ -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)