static int show_schedstat(struct seq_file *seq, void *v)
{
int cpu;
- int mask_len = NR_CPUS/32 * 9;
+ int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9;
char *mask_str = kmalloc(mask_len, GFP_KERNEL);
if (mask_str == NULL)
return res;
}
-const struct file_operations proc_schedstat_operations = {
+static const struct file_operations proc_schedstat_operations = {
.open = schedstat_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
+static int __init proc_schedstat_init(void)
+{
+ proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
+ return 0;
+}
+module_init(proc_schedstat_init);
+
/*
* Expects runqueue lock to be held for atomicity of update
*/
{
struct signal_struct *sig;
- sig = tsk->signal;
- if (unlikely(!sig))
+ /* tsk == current, ensure it is safe to use ->signal */
+ if (unlikely(tsk->exit_state))
return;
+
+ sig = tsk->signal;
if (sig->cputime.totals) {
struct task_cputime *times;
{
struct signal_struct *sig;
- sig = tsk->signal;
- if (unlikely(!sig))
+ /* tsk == current, ensure it is safe to use ->signal */
+ if (unlikely(tsk->exit_state))
return;
+
+ sig = tsk->signal;
if (sig->cputime.totals) {
struct task_cputime *times;
struct signal_struct *sig;
sig = tsk->signal;
+ /* see __exit_signal()->task_rq_unlock_wait() */
+ barrier();
if (unlikely(!sig))
return;
+
if (sig->cputime.totals) {
struct task_cputime *times;