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cgroup: use do_each_subsys_mask() where applicable 

There are several places in cgroup_subtree_control_write() which can
use do_each_subsys_mask() instead of manual mask testing.  Use it.

No functional changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
This commit is contained in:
Tejun Heo 2016-02-22 22:25:46 -05:00
parent b4e0eeafba
commit 996cd1fb73
1 changed files with 12 additions and 23 deletions
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35
kernel/cgroup.c
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@ -3082,10 +3082,7 @@ static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
* dependency. An invisible css is made visible when the userland
* explicitly enables it.
*/
for_each_subsys(ss, ssid) {
if (!(enable & (1 << ssid)))
continue;
do_each_subsys_mask(ss, ssid, enable) {
cgroup_for_each_live_child(child, cgrp) {
if (css_enable & (1 << ssid))
ret = create_css(child, ss,
@ -3096,7 +3093,7 @@ static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
if (ret)
goto err_undo_css;
}
}
} while_each_subsys_mask();
/*
* At this point, cgroup_e_css() results reflect the new csses
@ -3115,10 +3112,7 @@ static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
* state if it's made visible again later. Controllers which may
* be depended upon should provide ->css_reset() for this purpose.
*/
for_each_subsys(ss, ssid) {
if (!(disable & (1 << ssid)))
continue;
do_each_subsys_mask(ss, ssid, disable) {
cgroup_for_each_live_child(child, cgrp) {
struct cgroup_subsys_state *css = cgroup_css(child, ss);
@ -3130,7 +3124,7 @@ static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
ss->css_reset(css);
}
}
}
} while_each_subsys_mask();
kernfs_activate(cgrp->kn);
ret = 0;
@ -3142,10 +3136,7 @@ err_undo_css:
cgrp->subtree_control = old_sc;
cgrp->subtree_ss_mask = old_ss;
for_each_subsys(ss, ssid) {
if (!(enable & (1 << ssid)))
continue;
do_each_subsys_mask(ss, ssid, enable) {
cgroup_for_each_live_child(child, cgrp) {
struct cgroup_subsys_state *css = cgroup_css(child, ss);
@ -3157,7 +3148,7 @@ err_undo_css:
else
css_clear_dir(css, NULL);
}
}
} while_each_subsys_mask();
goto out_unlock;
}
@ -4973,14 +4964,12 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
goto out_destroy;
/* let's create and online css's */
for_each_subsys(ss, ssid) {
if (parent->subtree_ss_mask & (1 << ssid)) {
ret = create_css(cgrp, ss,
parent->subtree_control & (1 << ssid));
if (ret)
goto out_destroy;
}
}
do_each_subsys_mask(ss, ssid, parent->subtree_ss_mask) {
ret = create_css(cgrp, ss,
parent->subtree_control & (1 << ssid));
if (ret)
goto out_destroy;
} while_each_subsys_mask();
/*
* On the default hierarchy, a child doesn't automatically inherit