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Commit 3baee201 authored by Jani Nikula's avatar Jani Nikula Committed by Rusty Russell
Browse files

module: add module_param_unsafe and module_param_named_unsafe 



Add the helpers to be used by modules wishing to expose unsafe debugging
or testing module parameters that taint the kernel when set.

Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Jon Mason <jon.mason@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 91f9d330

include/linux/moduleparam.h

+18 −0
Original line number Diff line number Diff line
@@ -122,6 +122,12 @@ struct kparam_array 
#define module_param(name, type, perm)				\

	module_param_named(name, name, type, perm)



/**

 * module_param_unsafe - same as module_param but taints kernel

 */

#define module_param_unsafe(name, type, perm)			\

	module_param_named_unsafe(name, name, type, perm)



/**

 * module_param_named - typesafe helper for a renamed module/cmdline parameter

 * @name: a valid C identifier which is the parameter name.
@@ -138,6 +144,14 @@ struct kparam_array 
	module_param_cb(name, &param_ops_##type, &value, perm);		   \

	__MODULE_PARM_TYPE(name, #type)



/**

 * module_param_named_unsafe - same as module_param_named but taints kernel

 */

#define module_param_named_unsafe(name, value, type, perm)		\

	param_check_##type(name, &(value));				\

	module_param_cb_unsafe(name, &param_ops_##type, &value, perm);	\

	__MODULE_PARM_TYPE(name, #type)



/**

 * module_param_cb - general callback for a module/cmdline parameter

 * @name: a valid C identifier which is the parameter name.
@@ -149,6 +163,10 @@ struct kparam_array 
#define module_param_cb(name, ops, arg, perm)				      \

	__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, 0)



#define module_param_cb_unsafe(name, ops, arg, perm)			      \

	__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1,    \

			    KERNEL_PARAM_FL_UNSAFE)



/**

 * <level>_param_cb - general callback for a module/cmdline parameter

 *                    to be evaluated before certain initcall level