X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fmoduleparam.h;h=82a9124f7d758ae74ea04812da2cb51732dde893;hb=f653398c86a1c104f0992bd788dd4bb065449be4;hp=4a189dadb1607a0984cb41cac9f389d2a86afc65;hpb=9774a1f54f173ad18e816496c8979f1bf8ef666a;p=safe%2Fjmp%2Flinux-2.6

diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 4a189da..82a9124 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -13,12 +13,15 @@
 #define MODULE_PARAM_PREFIX KBUILD_MODNAME "."
 #endif
 
+/* Chosen so that structs with an unsigned long line up. */
+#define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long))
+
 #ifdef MODULE
 #define ___module_cat(a,b) __mod_ ## a ## b
 #define __module_cat(a,b) ___module_cat(a,b)
 #define __MODULE_INFO(tag, name, info)					  \
 static const char __module_cat(name,__LINE__)[]				  \
-  __attribute_used__							  \
+  __used								  \
   __attribute__((section(".modinfo"),unused)) = __stringify(tag) "=" info
 #else  /* !MODULE */
 #define __MODULE_INFO(tag, name, info)
@@ -33,12 +36,20 @@ typedef int (*param_set_fn)(const char *val, struct kernel_param *kp);
 /* Returns length written or -errno.  Buffer is 4k (ie. be short!) */
 typedef int (*param_get_fn)(char *buffer, struct kernel_param *kp);
 
+/* Flag bits for kernel_param.flags */
+#define KPARAM_ISBOOL		2
+
 struct kernel_param {
 	const char *name;
-	unsigned int perm;
+	u16 perm;
+	u16 flags;
 	param_set_fn set;
 	param_get_fn get;
-	void *arg;
+	union {
+		void *arg;
+		const struct kparam_string *str;
+		const struct kparam_array *arr;
+	};
 };
 
 /* Special one for strings we want to copy into */
@@ -58,22 +69,36 @@ struct kparam_array
 	void *elem;
 };
 
+/* On alpha, ia64 and ppc64 relocations to global data cannot go into
+   read-only sections (which is part of respective UNIX ABI on these
+   platforms). So 'const' makes no sense and even causes compile failures
+   with some compilers. */
+#if defined(CONFIG_ALPHA) || defined(CONFIG_IA64) || defined(CONFIG_PPC64)
+#define __moduleparam_const
+#else
+#define __moduleparam_const const
+#endif
+
 /* This is the fundamental function for registering boot/module
-   parameters.  perm sets the visibility in driverfs: 000 means it's
+   parameters.  perm sets the visibility in sysfs: 000 means it's
    not there, read bits mean it's readable, write bits mean it's
    writable. */
-#define __module_param_call(prefix, name, set, get, arg, perm)		\
+#define __module_param_call(prefix, name, set, get, arg, isbool, perm)	\
 	/* Default value instead of permissions? */			\
 	static int __param_perm_check_##name __attribute__((unused)) =	\
-	BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2));	\
-	static char __param_str_##name[] = prefix #name;		\
-	static struct kernel_param const __param_##name			\
-	__attribute_used__						\
+	BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2))	\
+	+ BUILD_BUG_ON_ZERO(sizeof(""prefix) > MAX_PARAM_PREFIX_LEN);	\
+	static const char __param_str_##name[] = prefix #name;		\
+	static struct kernel_param __moduleparam_const __param_##name	\
+	__used								\
     __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \
-	= { __param_str_##name, perm, set, get, arg }
+	= { __param_str_##name, perm, isbool ? KPARAM_ISBOOL : 0,	\
+	    set, get, { arg } }
 
 #define module_param_call(name, set, get, arg, perm)			      \
-	__module_param_call(MODULE_PARAM_PREFIX, name, set, get, arg, perm)
+	__module_param_call(MODULE_PARAM_PREFIX,			      \
+			    name, set, get, arg,			      \
+			    __same_type(*(arg), bool), perm)
 
 /* Helper functions: type is byte, short, ushort, int, uint, long,
    ulong, charp, bool or invbool, or XXX if you define param_get_XXX,
@@ -86,12 +111,32 @@ struct kparam_array
 #define module_param(name, type, perm)				\
 	module_param_named(name, name, type, perm)
 
+#ifndef MODULE
+/**
+ * core_param - define a historical core kernel parameter.
+ * @name: the name of the cmdline and sysfs parameter (often the same as var)
+ * @var: the variable
+ * @type: the type (for param_set_##type and param_get_##type)
+ * @perm: visibility in sysfs
+ *
+ * core_param is just like module_param(), but cannot be modular and
+ * doesn't add a prefix (such as "printk.").  This is for compatibility
+ * with __setup(), and it makes sense as truly core parameters aren't
+ * tied to the particular file they're in.
+ */
+#define core_param(name, var, type, perm)				\
+	param_check_##type(name, &(var));				\
+	__module_param_call("", name, param_set_##type, param_get_##type, \
+			    &var, __same_type(var, bool), perm)
+#endif /* !MODULE */
+
 /* Actually copy string: maxlen param is usually sizeof(string). */
 #define module_param_string(name, string, len, perm)			\
-	static struct kparam_string __param_string_##name		\
+	static const struct kparam_string __param_string_##name		\
 		= { len, string };					\
-	module_param_call(name, param_set_copystring, param_get_string,	\
-		   &__param_string_##name, perm);			\
+	__module_param_call(MODULE_PARAM_PREFIX, name,			\
+			    param_set_copystring, param_get_string,	\
+			    .str = &__param_string_##name, 0, perm);	\
 	__MODULE_PARM_TYPE(name, "string")
 
 /* Called on module insert or kernel boot */
@@ -101,6 +146,16 @@ extern int parse_args(const char *name,
 		      unsigned num,
 		      int (*unknown)(char *param, char *val));
 
+/* Called by module remove. */
+#ifdef CONFIG_SYSFS
+extern void destroy_params(const struct kernel_param *params, unsigned num);
+#else
+static inline void destroy_params(const struct kernel_param *params,
+				  unsigned num)
+{
+}
+#endif /* !CONFIG_SYSFS */
+
 /* All the helper functions */
 /* The macros to do compile-time type checking stolen from Jakub
    Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
@@ -139,21 +194,30 @@ extern int param_set_charp(const char *val, struct kernel_param *kp);
 extern int param_get_charp(char *buffer, struct kernel_param *kp);
 #define param_check_charp(name, p) __param_check(name, p, char *)
 
+/* For historical reasons "bool" parameters can be (unsigned) "int". */
 extern int param_set_bool(const char *val, struct kernel_param *kp);
 extern int param_get_bool(char *buffer, struct kernel_param *kp);
-#define param_check_bool(name, p) __param_check(name, p, int)
+#define param_check_bool(name, p)					\
+	static inline void __check_##name(void)				\
+	{								\
+		BUILD_BUG_ON(!__same_type(*(p), bool) &&		\
+			     !__same_type(*(p), unsigned int) &&	\
+			     !__same_type(*(p), int));			\
+	}
 
 extern int param_set_invbool(const char *val, struct kernel_param *kp);
 extern int param_get_invbool(char *buffer, struct kernel_param *kp);
-#define param_check_invbool(name, p) __param_check(name, p, int)
+#define param_check_invbool(name, p) __param_check(name, p, bool)
 
 /* Comma-separated array: *nump is set to number they actually specified. */
 #define module_param_array_named(name, array, type, nump, perm)		\
-	static struct kparam_array __param_arr_##name			\
+	static const struct kparam_array __param_arr_##name		\
 	= { ARRAY_SIZE(array), nump, param_set_##type, param_get_##type,\
 	    sizeof(array[0]), array };					\
-	module_param_call(name, param_array_set, param_array_get, 	\
-			  &__param_arr_##name, perm);			\
+	__module_param_call(MODULE_PARAM_PREFIX, name,			\
+			    param_array_set, param_array_get,		\
+			    .arr = &__param_arr_##name,			\
+			    __same_type(array[0], bool), perm);		\
 	__MODULE_PARM_TYPE(name, "array of " #type)
 
 #define module_param_array(name, type, nump, perm)		\
@@ -169,10 +233,22 @@ extern int param_get_string(char *buffer, struct kernel_param *kp);
 
 struct module;
 
+#if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
 extern int module_param_sysfs_setup(struct module *mod,
 				    struct kernel_param *kparam,
 				    unsigned int num_params);
 
 extern void module_param_sysfs_remove(struct module *mod);
+#else
+static inline int module_param_sysfs_setup(struct module *mod,
+			     struct kernel_param *kparam,
+			     unsigned int num_params)
+{
+	return 0;
+}
+
+static inline void module_param_sysfs_remove(struct module *mod)
+{ }
+#endif
 
 #endif /* _LINUX_MODULE_PARAMS_H */