diff options
| author | Luis R. Rodriguez | 2015-05-27 11:09:38 +0930 |
|---|---|---|
| committer | Rusty Russell | 2015-05-28 11:32:11 +0930 |
| commit | d19f05d8a8fa221e5d5f4eaca0f3ca5874c990d3 (patch) | |
| tree | af7ed11bef82faa0e7a33b6ec8739a32ec50f00f /kernel/params.c | |
| parent | 05f408dddb013168759cdb4cbd0ba4e189a9504d (diff) | |
kernel/params.c: generalize bool_enable_only
This takes out the bool_enable_only implementation from
the module loading code and generalizes it so that others
can make use of it.
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: cocci@systeme.lip6.fr
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'kernel/params.c')
| -rw-r--r-- | kernel/params.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/kernel/params.c b/kernel/params.c index b7635c025e9b..324624ed620f 100644 --- a/kernel/params.c +++ b/kernel/params.c @@ -335,6 +335,36 @@ const struct kernel_param_ops param_ops_bool = { }; EXPORT_SYMBOL(param_ops_bool); +int param_set_bool_enable_only(const char *val, const struct kernel_param *kp) +{ + int err = 0; + bool new_value; + bool orig_value = *(bool *)kp->arg; + struct kernel_param dummy_kp = *kp; + + dummy_kp.arg = &new_value; + + err = param_set_bool(val, &dummy_kp); + if (err) + return err; + + /* Don't let them unset it once it's set! */ + if (!new_value && orig_value) + return -EROFS; + + if (new_value) + err = param_set_bool(val, kp); + + return err; +} +EXPORT_SYMBOL_GPL(param_set_bool_enable_only); + +const struct kernel_param_ops param_ops_bool_enable_only = { + .flags = KERNEL_PARAM_OPS_FL_NOARG, + .set = param_set_bool_enable_only, + .get = param_get_bool, +}; + /* This one must be bool. */ int param_set_invbool(const char *val, const struct kernel_param *kp) { |