[PATCH v2] kernel/params.c: make use of unused but set variable

[Louis Langholtz]

While Rusty Russell wants the return value of sysfs_create_file
ignored, it's annotated '__must_check'. Tejun Heo made the annotaion
and suggests just using WARN_ON_ONCE(). Meanwhile the compiler warns that
the 'err' variable is set but unused. This patch uses Tejun's
suggestion. This eliminates the warning, satisfies the required check,
and warns if sysfs_create_file actually ever fails (something that Rusty
says should never happen when this code runs).

Signed-off-by: Louis Langholtz <lou_langholtz@xxxxxx>
---

diff --git a/kernel/params.c b/kernel/params.c
index a22d6a7..49406f9 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -853,6 +853,7 @@ static void __init version_sysfs_builtin(void)
 		mk = locate_module_kobject(vattr->module_name);
 		if (mk) {
 			err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr);
+			WARN_ON_ONCE(err);
 			kobject_uevent(&mk->kobj, KOBJ_ADD);
 			kobject_put(&mk->kobj);
 		}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/