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author | Rusty Russell <rusty@rustcorp.com.au> | 2008-10-22 10:00:23 -0500 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-10-22 10:00:23 +1100 |
commit | 67e67ceaac5bf55dbdceb704ff2d763d438b5373 (patch) | |
tree | 59523536661c93dce7a02557ca6ac5827a7bf75f /include/linux/moduleparam.h | |
parent | 9b473de87209fa86eb421b23386693b461612f30 (diff) | |
download | linux-stable-67e67ceaac5bf55dbdceb704ff2d763d438b5373.tar.gz linux-stable-67e67ceaac5bf55dbdceb704ff2d763d438b5373.tar.bz2 linux-stable-67e67ceaac5bf55dbdceb704ff2d763d438b5373.zip |
core_param() for genuinely core kernel parameters
There are a lot of one-liner uses of __setup() in the kernel: they're
cumbersome and not queryable (definitely not settable) via /sys. Yet
it's ugly to simplify them to module_param(), because by default that
inserts a prefix of the module name (usually filename).
So, introduce a "core_param". The parameter gets no prefix, but
appears in /sys/module/kernel/parameters/ (if non-zero perms arg). I
thought about using the name "core", but that's more common than
"kernel". And if you create a module called "kernel", you will die
a horrible death.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/moduleparam.h')
-rw-r--r-- | include/linux/moduleparam.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h index 1eefe6d61b86..e4af3399ef48 100644 --- a/include/linux/moduleparam.h +++ b/include/linux/moduleparam.h @@ -104,6 +104,25 @@ 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, perm) +#endif /* !MODULE */ + /* Actually copy string: maxlen param is usually sizeof(string). */ #define module_param_string(name, string, len, perm) \ static const struct kparam_string __param_string_##name \ |