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cgroup: refactor cgroup_masks_read() in the debug controller

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Factor out cgroup_masks_read_one() out of cgroup_masks_read() for
simplicity.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Waiman Long <longman@redhat.com>
This commit is contained in:
Tejun Heo 2017-06-14 16:01:36 -04:00
parent 8cc38fa7fa
commit 2866c0b4cf
1 changed files with 21 additions and 25 deletions
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46
kernel/cgroup/debug.c
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@ -200,36 +200,32 @@ static int cgroup_subsys_states_read(struct seq_file *seq, void *v)
return 0;
}
static void cgroup_masks_read_one(struct seq_file *seq, const char *name,
u16 mask)
{
struct cgroup_subsys *ss;
int ssid;
bool first = true;
seq_printf(seq, "%-17s: ", name);
for_each_subsys(ss, ssid) {
if (!(mask & (1 << ssid)))
continue;
if (!first)
seq_puts(seq, ", ");
seq_puts(seq, ss->name);
first = false;
}
seq_putc(seq, '\n');
}
static int cgroup_masks_read(struct seq_file *seq, void *v)
{
struct cgroup *cgrp = seq_css(seq)->cgroup;
struct cgroup_subsys *ss;
int i, j;
struct {
u16 *mask;
char *name;
} mask_list[] = {
{ &cgrp->subtree_control, "subtree_control" },
{ &cgrp->subtree_ss_mask, "subtree_ss_mask" },
};
mutex_lock(&cgroup_mutex);
for (i = 0; i < ARRAY_SIZE(mask_list); i++) {
u16 mask = *mask_list[i].mask;
bool first = true;
seq_printf(seq, "%-17s: ", mask_list[i].name);
for_each_subsys(ss, j) {
if (!(mask & (1 << ss->id)))
continue;
if (!first)
seq_puts(seq, ", ");
seq_puts(seq, ss->name);
first = false;
}
seq_putc(seq, '\n');
}
cgroup_masks_read_one(seq, "subtree_control", cgrp->subtree_control);
cgroup_masks_read_one(seq, "subtree_ss_mask", cgrp->subtree_ss_mask);
mutex_unlock(&cgroup_mutex);
return 0;
}