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authorJani Nikula <jani.nikula@intel.com>2014-08-27 06:23:23 +0930
committerRusty Russell <rusty@rustcorp.com.au>2014-08-27 21:54:08 +0930
commit3baee201b06cfaff84c2c5ddc551b192bb3eaed3 (patch)
tree68d6d30786363245fb1f4d64ae74615047df9aa1 /include/linux
parent91f9d330cc14932084c37751997213cb0e7ea882 (diff)
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: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/moduleparam.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 1e3ffb839daa..9531f9f9729e 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -123,6 +123,12 @@ struct kparam_array
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.
* @value: the actual lvalue to alter.
@@ -139,6 +145,14 @@ struct kparam_array
__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.
* @ops: the set & get operations for this parameter.
@@ -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