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cgroup: put cgroup_tryget_css() inside CONFIG_CGROUP_SCHED

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Put cgroup_tryget_css() inside CONFIG_CGROUP_SCHED to fix the warning
of 'cgroup_tryget_css' defined but not used [-Wunused-function] when
CONFIG_CGROUP_SCHED is disabled.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Miaohe Lin 2023-07-11 10:38:20 +08:00 • committed by Tejun Heo
parent 3ae0b77321
commit d1d4ff5d11
1 changed files with 22 additions and 22 deletions
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44
kernel/cgroup/cgroup.c
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@ -492,28 +492,6 @@ static struct cgroup_subsys_state *cgroup_css(struct cgroup *cgrp,
return &cgrp->self; return &cgrp->self;
} }
/**
* cgroup_tryget_css - try to get a cgroup's css for the specified subsystem
* @cgrp: the cgroup of interest
* @ss: the subsystem of interest
*
* Find and get @cgrp's css associated with @ss. If the css doesn't exist
* or is offline, %NULL is returned.
*/
static struct cgroup_subsys_state *cgroup_tryget_css(struct cgroup *cgrp,
struct cgroup_subsys *ss)
{
struct cgroup_subsys_state *css;
rcu_read_lock();
css = cgroup_css(cgrp, ss);
if (css && !css_tryget_online(css))
css = NULL;
rcu_read_unlock();
return css;
}
/** /**
* cgroup_e_css_by_mask - obtain a cgroup's effective css for the specified ss * cgroup_e_css_by_mask - obtain a cgroup's effective css for the specified ss
* @cgrp: the cgroup of interest * @cgrp: the cgroup of interest
@ -3655,6 +3633,28 @@ static int cgroup_stat_show(struct seq_file *seq, void *v)
} }
#ifdef CONFIG_CGROUP_SCHED #ifdef CONFIG_CGROUP_SCHED
/**
* cgroup_tryget_css - try to get a cgroup's css for the specified subsystem
* @cgrp: the cgroup of interest
* @ss: the subsystem of interest
*
* Find and get @cgrp's css associated with @ss. If the css doesn't exist
* or is offline, %NULL is returned.
*/
static struct cgroup_subsys_state *cgroup_tryget_css(struct cgroup *cgrp,
struct cgroup_subsys *ss)
{
struct cgroup_subsys_state *css;
rcu_read_lock();
css = cgroup_css(cgrp, ss);
if (css && !css_tryget_online(css))
css = NULL;
rcu_read_unlock();
return css;
}
static int cgroup_extra_stat_show(struct seq_file *seq, int ssid) static int cgroup_extra_stat_show(struct seq_file *seq, int ssid)
{ {
struct cgroup *cgrp = seq_css(seq)->cgroup; struct cgroup *cgrp = seq_css(seq)->cgroup;