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cpuset: use %*pb[l] to print bitmaps including cpumasks and nodemasks

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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>
This commit is contained in:
Tejun Heo 2015-02-13 14:37:23 -08:00 committed by Linus Torvalds
parent 660e5ec02d
commit e8e6d97c9b
1 changed files with 9 additions and 33 deletions
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42
kernel/cpuset.c
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@ -1707,40 +1707,27 @@ static int cpuset_common_seq_show(struct seq_file *sf, void *v)
{
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 @@ int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
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 @@ int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
*/
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 @@ int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,
/* 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));
}