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-rw-r--r--include/linux/moduleparam.h25
1 files changed, 24 insertions, 1 deletions
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index ec624381c84..e4af3399ef4 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -13,6 +13,9 @@
13#define MODULE_PARAM_PREFIX KBUILD_MODNAME "." 13#define MODULE_PARAM_PREFIX KBUILD_MODNAME "."
14#endif 14#endif
15 15
16/* Chosen so that structs with an unsigned long line up. */
17#define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long))
18
16#ifdef MODULE 19#ifdef MODULE
17#define ___module_cat(a,b) __mod_ ## a ## b 20#define ___module_cat(a,b) __mod_ ## a ## b
18#define __module_cat(a,b) ___module_cat(a,b) 21#define __module_cat(a,b) ___module_cat(a,b)
@@ -79,7 +82,8 @@ struct kparam_array
79#define __module_param_call(prefix, name, set, get, arg, perm) \ 82#define __module_param_call(prefix, name, set, get, arg, perm) \
80 /* Default value instead of permissions? */ \ 83 /* Default value instead of permissions? */ \
81 static int __param_perm_check_##name __attribute__((unused)) = \ 84 static int __param_perm_check_##name __attribute__((unused)) = \
82 BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)); \ 85 BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)) \
86 + BUILD_BUG_ON_ZERO(sizeof(""prefix) > MAX_PARAM_PREFIX_LEN); \
83 static const char __param_str_##name[] = prefix #name; \ 87 static const char __param_str_##name[] = prefix #name; \
84 static struct kernel_param __moduleparam_const __param_##name \ 88 static struct kernel_param __moduleparam_const __param_##name \
85 __used \ 89 __used \
@@ -100,6 +104,25 @@ struct kparam_array
100#define module_param(name, type, perm) \ 104#define module_param(name, type, perm) \
101 module_param_named(name, name, type, perm) 105 module_param_named(name, name, type, perm)
102 106
107#ifndef MODULE
108/**
109 * core_param - define a historical core kernel parameter.
110 * @name: the name of the cmdline and sysfs parameter (often the same as var)
111 * @var: the variable
112 * @type: the type (for param_set_##type and param_get_##type)
113 * @perm: visibility in sysfs
114 *
115 * core_param is just like module_param(), but cannot be modular and
116 * doesn't add a prefix (such as "printk."). This is for compatibility
117 * with __setup(), and it makes sense as truly core parameters aren't
118 * tied to the particular file they're in.
119 */
120#define core_param(name, var, type, perm) \
121 param_check_##type(name, &(var)); \
122 __module_param_call("", name, param_set_##type, param_get_##type, \
123 &var, perm)
124#endif /* !MODULE */
125
103/* Actually copy string: maxlen param is usually sizeof(string). */ 126/* Actually copy string: maxlen param is usually sizeof(string). */
104#define module_param_string(name, string, len, perm) \ 127#define module_param_string(name, string, len, perm) \
105 static const struct kparam_string __param_string_##name \ 128 static const struct kparam_string __param_string_##name \