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Message-Id: <1429739711-9415-5-git-send-email-mcgrof@do-not-panic.com>
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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