cpuset: use %*pb[l] to print bitmaps including cpumasks and nodemasks
printk and friends can now format bitmaps using '%*pb[l]'. cpumask
and nodemask also provide cpumask_pr_args() and nodemask_pr_args()
respectively which can be used to generate the two printf arguments
necessary to format the specified cpu/nodemask.
* kernel/cpuset.c::cpuset_print_task_mems_allowed() used a static
buffer which is protected by a dedicated spinlock. Removed.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index c54a1da..1d1fe93 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1707,40 +1707,27 @@
{
struct cpuset *cs = css_cs(seq_css(sf));
cpuset_filetype_t type = seq_cft(sf)->private;
- ssize_t count;
- char *buf, *s;
int ret = 0;
- count = seq_get_buf(sf, &buf);
- s = buf;
-
spin_lock_irq(&callback_lock);
switch (type) {
case FILE_CPULIST:
- s += cpulist_scnprintf(s, count, cs->cpus_allowed);
+ seq_printf(sf, "%*pbl\n", cpumask_pr_args(cs->cpus_allowed));
break;
case FILE_MEMLIST:
- s += nodelist_scnprintf(s, count, cs->mems_allowed);
+ seq_printf(sf, "%*pbl\n", nodemask_pr_args(&cs->mems_allowed));
break;
case FILE_EFFECTIVE_CPULIST:
- s += cpulist_scnprintf(s, count, cs->effective_cpus);
+ seq_printf(sf, "%*pbl\n", cpumask_pr_args(cs->effective_cpus));
break;
case FILE_EFFECTIVE_MEMLIST:
- s += nodelist_scnprintf(s, count, cs->effective_mems);
+ seq_printf(sf, "%*pbl\n", nodemask_pr_args(&cs->effective_mems));
break;
default:
ret = -EINVAL;
- goto out_unlock;
}
- if (s < buf + count - 1) {
- *s++ = '\n';
- seq_commit(sf, s - buf);
- } else {
- seq_commit(sf, -1);
- }
-out_unlock:
spin_unlock_irq(&callback_lock);
return ret;
}
@@ -2610,8 +2597,6 @@
return nodes_intersects(tsk1->mems_allowed, tsk2->mems_allowed);
}
-#define CPUSET_NODELIST_LEN (256)
-
/**
* cpuset_print_task_mems_allowed - prints task's cpuset and mems_allowed
* @tsk: pointer to task_struct of some task.
@@ -2621,23 +2606,16 @@
*/
void cpuset_print_task_mems_allowed(struct task_struct *tsk)
{
- /* Statically allocated to prevent using excess stack. */
- static char cpuset_nodelist[CPUSET_NODELIST_LEN];
- static DEFINE_SPINLOCK(cpuset_buffer_lock);
struct cgroup *cgrp;
- spin_lock(&cpuset_buffer_lock);
rcu_read_lock();
cgrp = task_cs(tsk)->css.cgroup;
- nodelist_scnprintf(cpuset_nodelist, CPUSET_NODELIST_LEN,
- tsk->mems_allowed);
pr_info("%s cpuset=", tsk->comm);
pr_cont_cgroup_name(cgrp);
- pr_cont(" mems_allowed=%s\n", cpuset_nodelist);
+ pr_cont(" mems_allowed=%*pbl\n", nodemask_pr_args(&tsk->mems_allowed));
rcu_read_unlock();
- spin_unlock(&cpuset_buffer_lock);
}
/*
@@ -2715,10 +2693,8 @@
/* Display task mems_allowed in /proc/<pid>/status file. */
void cpuset_task_status_allowed(struct seq_file *m, struct task_struct *task)
{
- seq_puts(m, "Mems_allowed:\t");
- seq_nodemask(m, &task->mems_allowed);
- seq_puts(m, "\n");
- seq_puts(m, "Mems_allowed_list:\t");
- seq_nodemask_list(m, &task->mems_allowed);
- seq_puts(m, "\n");
+ seq_printf(m, "Mems_allowed:\t%*pb\n",
+ nodemask_pr_args(&task->mems_allowed));
+ seq_printf(m, "Mems_allowed_list:\t%*pbl\n",
+ nodemask_pr_args(&task->mems_allowed));
}