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cgroup: remove gratuituous BUG_ON()s from rebind_subsystems() 

rebind_subsystems() performs santiy checks even on subsystems which
aren't specified to be added or removed and the checks aren't all that
useful given that these are in a very cold path while the violations
they check would trip up in much hotter paths.

Let's remove these from rebind_subsystems().

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2013-06-28 21:08:27 -07:00
parent 1d5be6b287
commit a698b4488a
1 changed files with 0 additions and 9 deletions
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9
kernel/cgroup.c
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@ -1077,15 +1077,6 @@ static int rebind_subsystems(struct cgroupfs_root *root,
/* subsystem is now free - drop reference on module */ /* subsystem is now free - drop reference on module */
module_put(ss->module); module_put(ss->module);
root->subsys_mask &= ~bit; root->subsys_mask &= ~bit;
} else if (bit & root->subsys_mask) {
/* Subsystem state should already exist */
BUG_ON(!cgrp->subsys[i]);
#ifdef CONFIG_MODULE_UNLOAD
BUG_ON(ss->module && !module_refcount(ss->module));
#endif
} else {
/* Subsystem state shouldn't exist */
BUG_ON(cgrp->subsys[i]);
} }
} }