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cgroup: clean up obsolete comment for parse_cgroupfs_options()

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1d5be6b287 ("cgroup: move module ref handling into
rebind_subsystems()") makes parse_cgroupfs_options() no longer takes
refcounts on subsystems.

And unified hierachy makes parse_cgroupfs_options not need to call
with cgroup_mutex held to protect the cgroup_subsys[].

So this patch removes BUG_ON() and the comment.  As the comment
doesn't contain useful information afterwards, the whole comment is
removed.

Signed-off-by: Jianyu Zhan <nasa4836@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Jianyu Zhan 2014-04-25 18:28:03 -04:00 committed by Tejun Heo
parent 6573157800
commit 2f0edc04e7
1 changed files with 0 additions and 8 deletions
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8
kernel/cgroup.c
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@ -1221,12 +1221,6 @@ struct cgroup_sb_opts {
bool none;
};
/*
* Convert a hierarchy specifier into a bitmask of subsystems and
* flags. Call with cgroup_mutex held to protect the cgroup_subsys[]
* array. This function takes refcounts on subsystems to be used, unless it
* returns error, in which case no refcounts are taken.
*/
static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
{
char *token, *o = data;
@ -1235,8 +1229,6 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
struct cgroup_subsys *ss;
int i;
BUG_ON(!mutex_is_locked(&cgroup_mutex));
#ifdef CONFIG_CPUSETS
mask = ~(1UL << cpuset_cgrp_id);
#endif