linux-kernel - [PATCH v2 4/8] moduleparam.h: add module_param_config

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Date:	Wed, 22 Apr 2015 14:55:07 -0700
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	rusty@...tcorp.com.au
Cc:	akpm@...ux-foundation.org, mingo@...nel.org, tj@...nel.org,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	keescook@...omium.org, casey@...aufler-ca.com,
	cocci@...teme.lip6.fr, "Luis R. Rodriguez" <mcgrof@...e.com>,
	Jani Nikula <jani.nikula@...el.com>
Subject: [PATCH v2 4/8] moduleparam.h: add module_param_config_*() helpers

From: "Luis R. Rodriguez" <mcgrof@...e.com>

This adds a couple of bool module_param_config_*() helpers
which are designed to let us easily associate a boolean
module parameter with an associated kernel configuration
option. Folks can use this to avoid what typically would
be #ifdef eyesores around module parameter declarations.

Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Jani Nikula <jani.nikula@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Tejun Heo <tj@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org
Cc: cocci@...teme.lip6.fr
Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
---
 include/linux/moduleparam.h | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 7e00799..5416372 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -155,6 +155,43 @@ struct kparam_array
 	__MODULE_PARM_TYPE(name, #type)
 
 /**
+ * module_param_config_on_off - bool parameter with run time override
+ * @name: a valid C identifier which is the parameter name.
+ * @value: the actual lvalue to alter.
+ * @perm: visibility in sysfs.
+ * @config: kernel parameter which will enable this option if this
+ * 	kernel configuration option has been enabled.
+ *
+ * This lets you define a bool module parameter which by default will be
+ * set to true if the config option has been set on your kernel's
+ * configuration, otherwise it is set to false.
+ */
+#define module_param_config_on_off(name, var, perm, config) 		\
+	static bool var = IS_ENABLED(config);				\
+	module_param_named(name, var, bool, perm);
+
+/**
+ * module_param_config_on - bool parameter with run time enablement override
+ * @name: a valid C identifier which is the parameter name.
+ * @value: the actual lvalue to alter.
+ * @perm: visibility in sysfs.
+ * @config: kernel parameter which will enable this option if this
+ * 	kernel configuration option has been enabled.
+ *
+ * This lets you define a bool module parameter which by default will be
+ * set to true if the config option has been set on your kernel's
+ * configuration, otherwise it is set to false. This particular helper
+ * will ensure that if the kernel configuration has been set you will not
+ * be able to disable this kernel parameter. You can only use this to let
+ * the an option that was disabled on your kernel configuration be enabled
+ * at run time.
+ */
+#define module_param_config_on(name, var, perm, config) 		\
+	static bool var = IS_ENABLED(config);				\
+	module_param_named(name, var, bool_enable_only, perm);
+
+
+/**
  * 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.
-- 
2.3.2.209.gd67f9d5.dirty

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