cgroup, sched: convert away from cftype->read_map()

In preparation of conversion to kernfs, cgroup file handling is being
consolidated so that it can be easily mapped to the seq_file based
interface of kernfs.

cftype->read_map() doesn't add any value and being replaced with
->read_seq_string().  Update cpu_stats_show() and cpuacct_stats_show()
accordingly.

This patch doesn't make any visible behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index f64722ff0299..dd88738cd4a9 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -184,7 +184,7 @@ static const char * const cpuacct_stat_desc[] = {
 };
 
 static int cpuacct_stats_show(struct cgroup_subsys_state *css,
-                              struct cftype *cft, struct cgroup_map_cb *cb)
+                              struct cftype *cft, struct seq_file *sf)
 {
         struct cpuacct *ca = css_ca(css);
         int cpu;
@@ -196,7 +196,7 @@ static int cpuacct_stats_show(struct cgroup_subsys_state *css,
                 val += kcpustat->cpustat[CPUTIME_NICE];
         }
         val = cputime64_to_clock_t(val);
-        cb->fill(cb, cpuacct_stat_desc[CPUACCT_STAT_USER], val);
+        seq_printf(sf, "%s %lld\n", cpuacct_stat_desc[CPUACCT_STAT_USER], val);
 
         val = 0;
         for_each_online_cpu(cpu) {
@@ -207,7 +207,7 @@ static int cpuacct_stats_show(struct cgroup_subsys_state *css,
         }
 
         val = cputime64_to_clock_t(val);
-        cb->fill(cb, cpuacct_stat_desc[CPUACCT_STAT_SYSTEM], val);
+        seq_printf(sf, "%s %lld\n", cpuacct_stat_desc[CPUACCT_STAT_SYSTEM], val);
 
         return 0;
 }
@@ -224,7 +224,7 @@ static struct cftype files[] = {
         },
         {
                 .name = "stat",
-                .read_map = cpuacct_stats_show,
+                .read_seq_string = cpuacct_stats_show,
         },
         { }     /* terminate */
 };